Parts

Box One™ fork adapters let you run standard "Male" 10mm (3/8" axles) in a fork designed for 20mm axles. - Material 6061-T6 Aluminum

Box One Linear Brake Cable Kits are among the most advanced BMX brake cables on the market. The custom Concentric housing includes aramid fiber-wrapped aluminum/steel linear wires for the best combination of strength and low weight. The inner Nano Cable wires are treated with a PTFE coating that reduces friction and boosts braking performance. Our anodized aluminum Kollars ferrules further reduce cable drag. Each cable kit includes 79 inches of Concentric Linear housing, a black PTFE-coated Nano Cable, four alloy Kollars ferrules and one color-matched and one black alloy cable end caps. Available in chrome, 14K gold, red, blue and black with alloy Kollars ferrules and end caps.

The Box Three Disc Brake Rotor is a Stainless Steel, 6 bolt rotor designed for BMX Race. Utilizing a small size and rounded outside edges for safety is the optimal size for any BMX Race bike. FEATURES: - ISO 6 bolt brake/hub interface - Rounded outside edges - Lightweight Cutouts - High quality stainless steel rotor - High quality locking steel T-25 rotor bolts included

- Cold forged, CNC-machined cartridge body with self-aligning pivoting posts - Triple-compound 70mm pads

- Heat treated allow steel solid links with solid pins - Compatible with SRAM, Shimano, and Box 11 speed drivetrains - Also compatible with Box's 7 speed downhill specific drivetrain

Box One 7075 Alloy Chainring bolt kits include five 8.5-mm front bolts, five 6-mm front bolts, and five 5-mm rear nuts, so they will fit just about any chainring/crank combination, including those with threaded holes.

Manufactured in the US by ODI, Box One grips feature a hexagonal textured pattern over more than 85 percent of the grip to ensure proper traction and comfort. Comfort ribs support and cushion the rider’s thumbs, while material has been removed from non-contact areas to save weight. Box One Grips are available in black and include four standard, ODI Lock-On grip clamps with laser-etched Box logos and two Snap Cap end plugs. Of course Box One Grips work seamlessly with Genius Brake Levers and the new Genius Grip Clamp, which are available separately. Specs: - Width 130mm - Origin Made in the USA - Compatibility Genius Brake Levers & Grip Clamps (sold separately) - Weight 102 grams / 3.6 ounces

Box One Single-Speed Aluminum Cogs are 7075-T6 aluminum alloy. It's designed to fit Shimano compatible cassette hubs and has a 5mm wide inner base, giving a more solid interface with the cassette body. The alloy cogs are anodized black with laser-etched graphics. FEATURES - Shimano Compatible Driver - 7075-T6 Alloy - 3/32" or 1/8" Chain Compatible - Lightweight SPECIFICATIONS - Material: 7075-T6 Aluminum - Process: Laser-etched logos Weight - 13t: 8 grams / 0.3 ounces - 14t: 11 grams / 0.4 ounces - 15t: 13 grams / 0.5 ounces - 16t: 14 grams / 0.8 ounces - 17t: 16 grams / 0.6 ounces - 18t: 18 grams / 0.65 ounces

Box Three V-Point Brake Levers are the most versatile levers in the entire Box family. Available in either short or long reach versions, Box Three Levers are reversible, allowing users to 'flip' the lever for use on either side of the handlebar. Other features include reaching adjustment for accurate positioning and a barrel adjuster to fine-tune cable tension.

Box Three V-Point Brake Levers are the most versatile levers in the entire Box family. Available in either short or long reach versions, Box Three Levers are reversible, allowing users to 'flip' the lever for use on either side of the handlebar. Other features include reaching adjustment for accurate positioning and a barrel adjuster to fine-tune cable tension.

The Box Four shifter's main features aren't strikingly different from Box Three's. The key difference is its 8-speed platform. We've chosen to modernize the 8-speed in much the same way we did the 9-speed for Prime 9. Just like the Prime 9, the Box Four shifters take advantage of the "less is more" theme and exploit durability, simplicity, and reliability. Available as a multi-shift (pull several gears at once) or single-shift shifter (a sound choice for e-bikes). -Our 8 is Enough Shifter -Lightweight Extruded Clamp -Responsive 2 Piece Pull Lever -MTB Style Release Lever (V2) Weight: 128g/4.5oz

Box One Single-Speed Chromoly Cogs are CNC-machined from long-wearing CNC-machined chrome-molybdenum. It's designed to fit Shimano™ compatible cassette hubs and has a 5mm wide inner base, giving a more solid interface with the cassette body. FEATURES - Chromoly Steel Offers Extra Long Service Life - 5mm Wide Inner Base to Give a More Solid Interface with Freehub Body

Box Two™ Brake Post Extenders are the perfect solution for those riders needing extra brake pad adjustment without switching frame sizes. CNC-machined from 6061-T6 aluminum, Box Two™ Brake Post Extenders easily mount to any frame's existing cantilever brake bosses. They provide an additional 16 mm of brake arm positioning. Typically, they are most useful when a rider transitions from one wheel size to the next (i.e., 451 to 406). Depending on your application, they can be mounted in either one of two positions -- above the frame's v-brake mounts or below (see Technical). FEATURES: - Cantilever brake boss compatible - 16 mm of brake arm positioning - 6061-T6 aluminum - Thread M10 x 1.25 SPECIFICATIONS: - Material: 6061-T6 Aluminum - Thread: M10 x 1.25 - Weight: 32 grams / 1.1 ounces

Cold forged and fully CNC-machined from several high-strength aluminum alloys, new Box One™ Stem Locks offer peace of mind and a level of added protection against losing your front wheel and fork legs in the event of a broken steerer tube. All new Box One™ Stem Locks are backward compatible with existing Box forks and may work with forks from other manufacturers.

Cold forged and fully CNC-machined from several high-strength aluminum alloys, new Box One™ Stem Locks offer peace of mind and a level of added protection against losing your front wheel and fork legs in the event of a broken steerer tube. All new Box One™ Stem Locks are backward compatible with existing Box forks and may work with forks from other manufacturers.

Cold forged and fully CNC-machined from several high-strength aluminum alloys, new Box One™ Stem Locks offer peace of mind and a level of added protection against losing your front wheel and fork legs in the event of a broken steerer tube. All new Box One™ Stem Locks are backward compatible with existing Box forks and may work with forks from other manufacturers.

DESCRIPTION The Box Three Brake is available in 85mm with short reach lever or 108mm with long reach lever. They include two-tone, dual-compound pads that feature a unique finned design that helps improve airflow. The Philips head tension screws aid installation and makes toe-in adjustments simple and easy. FEATURES - Cold Forged from 6061-T6 Aluminum - Up to 35mm of brake pad adjustment - Box Three™ Air Flow Brake Shoes w/ Dual Compound Pads - Brass bushings, Stainless Steel Hardware - Phillips head tension screw - 5mn allen key to secure cable on right arm

Box Two Saddles are the first of their kind, featuring a proprietary co-molded nylon shell and carbon fiber Seatpost. Super lightweight and designed specifically for BMX racing, they feature the Box logo molded into the top and have reduced profiles to prevent snagging on pants. FEATURES - Impact-Resistant - Minimum Insert Indicator - Durable Construction

The Box Three shifter makes good use of nylon composites in both top and bottom shells as well as the levers. Box Three is our performance and value tier. So this shifter sheds all the fancy trappings of the top 2 tiers but maintains their shifting characteristics. All Prime 9 shifters take advantage of the 9-speed's inherent durability, simplicity, and reliability. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. And the best part is? Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Available as a multi-shift (pull several gears at once) or single-shift shifter (a sound choice for e-bikes).

The Box Three shifter makes good use of nylon composites in both top and bottom shells as well as the levers. Box Three is our performance and value tier. So this shifter sheds all the fancy trappings of the top 2 tiers but maintains their shifting characteristics. All Prime 9 shifters take advantage of the 9-speed's inherent durability, simplicity, and reliability. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. And the best part is? Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Available as a multi-shift (pull several gears at once) or single-shift shifter (a sound choice for e-bikes).

Box Two Square Taper Chromoly Bottom Brackets are the best option for young BMX racers and other users of three-piece cranks in search of an affordable, high-performance square taper bottom bracket. Each bottom bracket is hand-assembled with a Chromoly spindle, sealed bearings, forged and CNC-machined alloy cups, and a composite center spacer/seal. Features: - Precision Abec-5 Sealed Bearings Compatibility: - Box Five Square Taper Crankset Specs: - Process: CNC-Machined Cups Material: - Spindle: Chromoly - Cups - Alloy - Sleeve - ABS Plastic - Finish: Nickel Coating - Spindle Type: JIS Square Taper - Spindle Length: 108mm or 113mm - Shell Width: 68mm - Thread: 1.37" x 24 TPI - Compatibility: BSA Threaded - Weight [108-113] (+/- 5%): 272 g / 9.6 oz

The Box One Disc Brake Adapter is designed to improve braking control on frames where disc brakes were not standard. Compatible with 2 types of dropouts and 3-10mm hubs, the Box Disc Brake Adapter goes over your hub’s axle and mates with the frame’s dropout in the right configurations allowing mounting of a standard post mount disc brake caliper. Please note this product is NOT universally compatible. We strongly recommend reading the Compatibility and Installation instructions for details before purchasing. FEATURES - 3-10mm hub - 6061-T6 aluminum - 140mm Brake Rotor Only - Post Mount Caliper Compatibility - 150lb Rider Weight Limit

The Box Four cassette adapts our Prime 9 philosophy of durability, simplicity, and reliability at a great price point. All cogs are stamped from steel, given our durable black coating and then the larger cogs are pinned to each other with spacers for easy installation. - Compatible with HG freehub bodies - Steel stamped cogs - No spiders - Wide ratio and consistent progression - ED black protection

- CNC-machined 6061-T6 aluminum with rounded tooth profile to reduce chain wear

The Box One chain is protected by our dual-coating. We start with Nickel plating which aids in corrosion resistance and then top it off with the "Diamond-Like Carbon" layer. The DLC is as fancy as it sounds; a synthetic diamond nano-coating that turns up the volume on hardness, wear-resistance, and slickness. All Prime 9 chains have chamfered shifting edges, solid plates and solid pins to safeguard durability. Our unique inner link spacing is engineered to grab those modern wide/narrow chainrings. We chose to modernize the 9-speed platform due to the chain's spirited reputation. FEATURES - Our Best Performing Chain - Durable Dual-Coating - Includes Black Connecting Link COMPATIBILITY - Box One Prime 9 11-50T and also 12-50T eBike Cassette Black - Box Two Prime 9 11-50T and also 12-50T eBike Cassette Black - Box Three Prime 9 11-50T and also 12-50T eBike Cassette Black - Box One Prime 9 Rear Derailleur - Box Two Prime 9 X-Wide Rear Derailleur Black - Box Three Prime 9 X-Wide Rear Derailleur Black - Box One Prime 9 Shifter Black - Box Two Prime 9 Shifter Black - Box Three Prime 9 Shifter Black - Box Two Chainring - Box One Single Speed Aluminum Cogs - Box One Single Speed Chromoly Cogs - Box Two Freewheel - Perfect for your 3/32" BMX Chainring

The Box Two Front Top is a modern 1-1/8 inch by 22.2mm stem designed specifically for BMX racing. Box Two Top Load stem bodies are cold-forged and CNC-machined from the highest quality 6061-T6 aluminum. The lightweight front clamps are cold-forged and CNC-machined for increased stiffness and strength. -Material: 6061-T6 Aluminum -Process: Cold-Forged -Hardware: Chromoly Clamping Bolts -Finish: Anodized w/Laser-Etched Graphics Weight: -48mm: 234 g / 8.3 oz -53mm: 240 g / 8.5 oz

Box Two 24mm External bottom brackets feature cold-forged, CNC-machined alloy cups, dual-labyrinth bearing covers, and precision sealed bearings. They are the perfect match to Box Three, Four cranks, and the ultimate upgrade to the budget BBs sold with most cranksets. Box Two, 24mm External Bottom Brackets, are designed to fit all 24-millimeter crank spindles and frames with 68 or 73 x BC 1.37-inch bottom bracket shells. Features: - Stable Outboard Bearing Position - Precision Abec-5 Sealed Bearings Compatibility: - Compatibility: Box Three, Box Four, Shimano HollowTech II, RaceFace X-Type - Material: 6061-T6 Aluminum - Shell Width: 68mm/73mm - Spindle Type: 24mm - Thread: 1.37 Inch x 24 TPI - Weight: 105 grams / 3.7 ounces Specs: Process: CNC-Machined Cups Material: - Cups: Alloy - Sleeve - ABS Plastic Finish: Anodized Spindle Type: 24mm Shell Width: 68/73mm Thread: 1.37 Inch x 24 TPI (English) Compatibility: - Shell: BSA (Euro) Threaded - Spindle: Box Three, Box Four, Shimano HollowTech II, RaceFace X-Type Weight (+/- 5%): 105 g / 3.7 oz

All Box headsets are engineered and crafted using our Oversized Technology. As we follow the load paths down the handlebars, through the stem-to-bar interface, we arrive at the headset focal point. Since any steering stiffness can easily be lost to headset play, we have concentrated our attention on manufacturing tolerances and quality of materials for the bearing, CNC bearing cover, and crown race. Now that this junction is steadfast you can rest assured that your cockpit’s steering stiffness will transfer onto the fork. When combined with Box’s other Oversized components, you’ll experience heightened responsiveness and reduced latency. Key differences: In this particular model headset we’ve gone to a 1.5” bottom race to fill a tapered head tube. This mates with our oversized X5 carbon fork. Larger and smoother contact areas spread the load effectively and counteract flex. FEATURES - Oversized Technology™ - Massive 1.5” Diameter - Massive Sealed Bearings - Star-Nut Compression System - Includes 1-?” Reducer Race for 1-1/8” Steerer Tube COMPATIBILITY - Box One X5 Fork - Box One X2 Fork - Box One XL Fork - Frames with an Integrated NON-Tapered Head Tube

The Box Two shifter is the only shifter on the market (other than our Box One) that comes factory stock with a hinged clamp. Box Two is our performance tier so this shifter still maintains the durable cast aluminum top shell but trades out the Box One's 1-piece pull-lever for a 2-piece resin and steel variant. All Prime 9 shifters take advantage of the 9-speed's inherent durability, simplicity, and reliability. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. And the best part is? Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Available as a multi-shift (pull several gears at once) or single-shift shifter (a sound choice for e-bikes).

The Box Two shifter is the only shifter on the market (other than our Box One) that comes factory stock with a hinged clamp. Box Two is our performance tier so this shifter still maintains the durable cast aluminum top shell but trades out the Box One's 1-piece pull-lever for a 2-piece resin and steel variant. All Prime 9 shifters take advantage of the 9-speed's inherent durability, simplicity, and reliability. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. And the best part is? Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Available as a multi-shift (pull several gears at once) or single-shift shifter (a sound choice for e-bikes).

The Box Four Rear Derailleur is the base of Prime 9 Technology that offers an affordable clutch based 1 by 8-speed derailleur that is simple and light; this makes it a perfect candidate for every entry-level bike that traditionally has a 3 by drive-train that is neither durable nor user friendly.

The Box Three Brake is available in 85mm with short reach lever or 108mm with long reach lever. They include two-tone, dual-compound pads that feature a unique finned design that helps improve airflow. The Philips head tension screws aid installation and makes toe-in adjustments simple and easy. Box Three V-Point Brake Levers are the most versatile levers in the entire Box family. Available in either short or long reach versions, Box Three Levers are reversible, allowing users to 'flip' the lever for use on either side of the handlebar. Other features include reaching adjustment for accurate positioning and a barrel adjuster to fine-tune cable tension. - Cold Forged from 6061-T6 Aluminum - Up to 35mm of brake pad adjustment - Box Three Air Flow Brake Shoes w/ Dual Compound Pads - Brass bushings, stainless steel hardware - Phillips head tension screw - 5mn allen key to secure cable on right arm - Includes Box Two Black Brake Housing and Stainless Steel Cable

- Superlight co-molded nylon shell and carbon fiber seatpost specifically for BMX Race - Large saddle has a 27.2 seatpost, while the small has a 22.2 post

Featuring a JIS square taper standard, our oversized bottom bracket interface showcases a step-down shape specific to the crank arm-length meeting at the pedal boss. Unlike alternative options, no two lengths are the same. Our durable cold-forged cranksets are available in sizes from 135mm through 170mm and employ a 5-bolt 110 BCD chainring pattern. All JIS square taper standard cranks are compatible with all BSA European-style square taper bottom brackets. FEATURES - Oversized Bottom Bracket Interface - Durable Cold-Forged Construction - JIS Square Taper Design COMPATIBILITY - Box One Bottom Bracket Square-Taper Titanium/Carbon - Box Two Bottom Bracket Square-Taper Chromoly - Box Three Square Taper Steel Bottom Bracket - Box One Chromoly Chainring Bolts - Box One 7075 Alloy Chainring Bolts

All Box stems are engineered and crafted using our Oversized Technology. As we follow the load paths down the handlebars we have focused our attention on the stem-to-bar interface. Since the Oversized handlebars have an increased wall thickness and tube diameter in this sector we have reciprocated with an augmented stem interface with greater surface area. We’ve done this by moving material from low stress areas. This has greatly minimized twist and contributed to responsiveness. As the stem in mated with the handlebars we have contributed to increased pedaling stiffness by providing a backstop to the “lifting” phenomenon. There is no point pushing hard on your pedals if you can’t pull up on your handlebars and deliver that power. Power can easily be lost to handlebar-to-stem deflection and the consequences can be poor power delivery and steering control. When combined with Box’s other Oversized components, you’ll experience heightened responsiveness and reduced latency. Key differences: This particular model stem pushes our Oversized Technology to the extreme as it maximizes the shift of material from low stress zones to the Oversized interface. These stems are engineered for the smaller-sized racers. -Lightweight 3D Hollow Design -Front-Load Clamp Design to Fight Pull-Up Forces -Large Bar Bore -Large Hollow Clamping Bolts -Superior Strength

All Box stems are engineered and crafted using our Oversized Technology. As we follow the load paths down the handlebars we have focused our attention on the stem-to-bar interface. Since the Oversized handlebars have an increased wall thickness and tube diameter in this sector we have reciprocated with an augmented stem interface with greater surface area. We’ve done this by moving material from low stress areas. This has greatly minimized twist and contributed to responsiveness. As the stem in mated with the handlebars we have contributed to increased pedaling stiffness by providing a backstop to the “lifting” phenomenon. There is no point pushing hard on your pedals if you can’t pull up on your handlebars and deliver that power. Power can easily be lost to handlebar-to-stem deflection and the consequences can be poor power delivery and steering control. When combined with Box’s other Oversized components, you’ll experience heightened responsiveness and reduced latency. Key differences: In this particular model stem we’ve modulated the Oversized formula to emphasize pedaling stiffness. We have transferred material specifically to sectors that experience sudden stress from pulling up on the handlebars. You’ll feel a difference in your acceleration. These stems are engineered for the larger-sized racers. -Material: 6061-T6 Aluminum -Process: Cold-Forged -Hardware: Chromoly Clamping Bolts -Finish: Anodized w/Laser-Etched Graphics Weight: -48mm: 280 g / 9.8 oz -53mm: 290 g / 10.2 oz

All Box stems are engineered and crafted using our Oversized Technology. As we follow the load paths down the handlebars we have focused our attention on the stem-to-bar interface. Since the Oversized handlebars have an increased wall thickness and tube diameter in this sector we have reciprocated with an augmented stem interface with greater surface area. We’ve done this by moving material from low stress areas. This has greatly minimized twist and contributed to responsiveness. As the stem in mated with the handlebars we have contributed to increased pedaling stiffness by providing a backstop to the “lifting” phenomenon. There is no point pushing hard on your pedals if you can’t pull up on your handlebars and deliver that power. Power can easily be lost to handlebar-to-stem deflection and the consequences can be poor power delivery and steering control. When combined with Box’s other Oversized components, you’ll experience heightened responsiveness and reduced latency. Key differences: In this particular model stem we’ve tailored the Oversized strategy to favor utility and access. The geometry has been altered to allow for easy handlebar removal while at the same time scavenging material from low stress zones. Ideal for those who don’t want to compromise on user experience to gain performance. These stems are engineered for the larger-sized racers.

The Box Three E-Bike Cassette offers high gears with more teeth to withstand the rigors of modern E-Bike riding. Adding an extra tooth to each of the three highest gears provides increased durability and decreased wear by distributing the load over a larger area! The Box Three E-bike cassette draws from both of its Box One and Box Two siblings to create a sensible all-rounder. All cogs are stamped from steel and subsequently, the larger ones are pinned to steel spiders. The main difference here versus Box Two is the use of additional weight-reducing holes on the cogs. FEATURES - Our Best All-Rounder Cassette - Steel Stamped Cogs - Steel Stamped Spiders - Ultra-Wide Ratio with Consistent Progression COMPATIBILITY - Box One Prime 9 Chain 126L DLC Black - Box Two Prime 9 126 Link Chain Nickel - Box Three Prime 9 126 Link Chain Polished - Box One Prime 9 Rear Derailleur - Box Two Prime 9 X-Wide Rear Derailleur Black - Box Three Prime 9 X-Wide Rear Derailleur Black - Box One Prime 9 Single Shifter Black - Box Two Prime 9 Single Shifter Black - Box Three Prime 9 Single Shifter Black

The Box One multi shifter is the only shifter on the market that comes factory stock with a hinged (and machined) clamp. It's top of the line and comes packed with other features such as a durable cast aluminum pull lever and top shell. All Prime 9 shifters take advantage of the 9-speed's inherent durability, simplicity, and reliability. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. And the best part is? Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Available as a multi-shift (pull several gears at once) or single-shift shifter (a sound choice for e-bikes).

The Box One multi shifter is the only shifter on the market that comes factory stock with a hinged (and machined) clamp. It's top of the line and comes packed with other features such as a durable cast aluminum pull lever and top shell. All Prime 9 shifters take advantage of the 9-speed's inherent durability, simplicity, and reliability. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. And the best part is? Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Available as a multi-shift (pull several gears at once) or single-shift shifter (a sound choice for e-bikes).

The Box Three Prime 9 cassette is a great all-around cassette option. All cogs are stamped from steel and subsequently, the larger ones are pinned to alloy spiders. It also features weight-reducing holes on the cogs. - The Box Three Prime 9 offers ultra-wide ratio with consistent progressions - Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through - Fewer parts, reduced weight, and increased durability - Cogs pinned to lightweight spiders - Constructed using a standard freehub body (HG) - Cassette Body Type: Shimano/SRAM 8, 9, 10 Speed - Drivetrain Speeds: 9 - Designed for ebike: Yes - Color: ED Black

- Cold-forged, CNC-machined 6061-T6 aluminum with built-in return spring - Clamp integrates with ODI Lock-On grips - 50g

Box One Genius brake levers are the first ever to incorporate a clamp for ODI Lock-On grips. This ensures that your grips stay put while eliminating the need for an extra clamp. At roughly 50 grams, these cold-forged and CNC-machined levers beat any other on the market. Genius levers have a built-in return spring and are fully compatible with carbon handlebars. The Mid reach lever features a new design that puts it in the same reach position as the Long, but with a more BMX-specific blade for better one-finger leverage. Other features include adjustable reach, a titanium mounting bolt, and stainless steel hardware. Genius levers are designed to work with linear-pull brakes. They are excellent for BMX, mountain, city, urban, and tandem flat-bar bicycles.

The Box Three Rear Derailleur simplifies the features found on the Prime 9 Box One and Two rear derailleurs making for a fully featured wallet friendly rear derailleur. Including a Limited Slip Clutch, Sealed bearing pulleys and a solid construction Box Three Rear derailleurs are compatible with 11-46 and 11-50t derailleurs making it one of the most versatile derailleur offerings for Prime 9.

Hollow stems are cold forged from the highest quality 6061-T6 aluminum available. Featuring an open skeletal design and a dual mid-bolt wedge mounting system, they are lightweight yet maintain a very high level of strength. A 53mm extension stem weighs just 218 grams/7.7 ounces. By removing the rear pinch bolts and moving the mounting bolts to the middle of the stem, we reduced the weight and size and eliminated a serious hazard to the rider’s knees. These stems come with either a 48- or 53mm extension and a 22.2mm bar bore. To ensure proper clamping force, the stem must be mounted on a fork with at least 45mm of exposed steerer tube. Not compatible with forks that have carbon fiber steerer tubes.

The BOX Two Prime 9 Cassette delivers long service life and extra range. All cogs are stamped from steel and the larger ones are pinned to alloy spiders. - Cogs pinned to lightweight spiders - Ultra-wide ratio with consistent progression - Prime 9 technology - Compatible with HG freehub bodies - 12 – 50T: Rated for eBike use

The Box Two E-Bike Cassette differentiates itself from its non-e-bike sibling by offering high gears with more teeth to withstand the rigors of modern E-Bike riding. Adding an extra tooth to each of the three highest gears provides increased durability and decreased wear by distributing the load over a larger area! All cogs are stamped from steel and subsequently, the larger ones are pinned to alloy spiders. Due to its provenance, this is, without a doubt, the most durable cassette in the range and perfect for any E-MTB. FEATURES - Our Most Durable Cassette - Steel Stamped Cogs - Lightweight Alloy Spiders - Ultra-Wide Ratio with Consistent Progression COMPATIBILITY - Box One Prime 9 Chain 126L DLC Black - Box Two Prime 9 126 Link Chain Nickel - Box Three Prime 9 126 Link Chain Polished - Box One Prime 9 Rear Derailleur - Box Two Prime 9 X-Wide Rear Derailleur Black - Box Three Prime 9 X-Wide Rear Derailleur Black - Box One Prime 9 Single Shifter Black - Box Two Prime 9 Single Shifter Black - Box Three Prime 9 Single Shifter Black

- Cold-forged 6061-T6 aluminum arms, available in 85mm or 108mm - Precision sealed bearing pivots, titanium and stainless steel hardware - Flexible cable noodle and streamlined cable fixing point - 35 millimeters of vertical brake pad adjustment

For Box braking we’ve limited the use of our Oversized Technology to the V area since the levers need to be minimalist and largely act as a remote for the V-Brakes. To reduce lateral deflection at the V we chose to enlarge the pivot areas and arms while tightening tolerances at their interfaces. We robbed material from unloaded sections to reinforce these zones of high stress. Not only are you going to be more efficient with brake power delivery, but you’ll also feel the instant response of deceleration. Key differences: The Box One V-Brake are the only brakes in the Box line-up to be blessed with Oversized Technology. They are also the only model to use sealed precision bearings to further reduce non-rotational movement. The 108mm long-reach brakes are excellent for BMX, mountain, city, urban and tandem bicycles using linear-pull-compatible levers. The 85-mm short reach (AKA mini-V) brakes are an excellent choice for cyclocross or drop-bar gravel bikes.

The Box Two Prime 9 Rear Derailleur is very similar to the Box One version however, to be more wallet friendly, it offers a non adjustable Tri-Pack Clutch, bushing pulleys and some muted finishes. Box Two rear derailleurs are still optimized for 11-50t cassettes and offer durability and performance for the most demanding terrain, just at lower price!

With precision sealed bearings and cold-forged, aluminum CNC machined cups, the Box One™ Titanium Square Taper bottom brackets are the best option for young BMX racers and other users. It is a three-piece crank in search of performance gains and weight savings. They have hollow, custom titanium-nitride-coated titanium spindles and carbon fiber center seals, helping keep the weight down between 185 and 190 grams (well below that of other square taper bottom brackets on the market). Other features include cups that are anodized black with anodized gold inner seals and a JIS tapered spindle that comes in either 108 or 113 millimeters. Weight Limit: 115kg (253 lbs) with limitations as per Category 2 of EN 16054:2012 Standard Features: - Precision Abec-5 Sealed Bearings - Lightweight Non-Structural Carbon Components - Extra Rigid Titanium Spindle Compatibility: - Box Five Square Taper Crankset Specs: Process: CNC-Machined Cups Material: - Spindle: Titanium - Cups: Alloy - Sleeve: Carbon Fiber Finish: Titanium Nitride Coated Spindle Type: JIS Square Taper Spindle Length: 108mm or 113mm Shell Width: 68mm Thread: 1.37" x 24 TPI Compatibility: BSA Threaded Weight [108-113] (+/- 5%): 199-204 g / 7-7.2 oz

Our Box Four tier is for those people who just want less fuss! You're fond of Prime 9, but know 8 is enough, and surely 11-42T is plenty of range for an 8-speed cassette. Our derailleur still has the Limited Slip clutch but now arrives with a more compact cage. The custom 8-speed chain is built for abuse, although it's sophisticated enough to have its own Wide/narrow chainring. Push through fewer gears with a no-nonsense shifter. This combo will transport you to 1 by territory for less than $200.

Our Box Four tier is for those people who just want less fuss! You're fond of Prime 9, but know 8 is enough, and surely 12-42T is plenty of range for an 8-speed cassette. Our derailleur still has the Limited Slip clutch but now arrives with a more compact cage. The custom 8-speed chain is built for abuse, although it's sophisticated enough to have its own Wide/narrow chainring. Push through fewer gears with a no-nonsense single shifter whose action is limited to one downshift per lever swing. This combo will transport your E-bike to 1 by territory for less than $200. INCLUDES - Box Four 8 Speed Single Shift Shifter - Box Four 8 Speed Wide Rear Derailleur - Box Four 8-Speed 12-42T E-Bike Cassette - Box Four 8 Speed 116 Link Chain Natural

The Box One Prime 9 Rear Derailleur takes the advantages of our legacy 9-speed drive-train but adds the advancements of a modern 1 by; a fully adjustable Tri-Pack Clutch, and an x-wide cage optimized for an 11-50T cassette. Forged construction steps up the durability and performance to an unparalleled level. Suited for the most demanding terrain.

Our Box Three tier delivers many of the same capabilities of its more famous siblings yet it's built upon a simpler platform. Cassettes are accessible at 11-46T or 11-50T and fashioned with steel spiders. The derailleur exploits our Limited Slip clutch technology without the Tri-pack features. Shift easily with a comparable mechanism, although you'll forgo the hinged clamp and die-cast structure. And lastly, string it all together with a Prime 9 chain but without extravagant coatings. If you're looking to bring your 2/3 by bike into the 21st century, then level up with this group!

The Box Three Crankset features a hollow-forged 2-piece design with an oversized bottom bracket interface. The 24mm spindle is pressed into the drive-side crank arm for durability and easy installation. The non-drive side crank arm features a 2-bolt pinch system for added strength. Our unique 4-bolt 104 BCD spider features a flex-resistant ring for optimum performance. Box Three Cranks feature steel pedal inserts that require pedal washers and externally sealed bearing BSA bottom brackets, both provided in the box. FEATURES - Hollow Forged Design - Dual Pinch Bolts for Even Clamping Force - Spider with Flex-Resistant Ring COMPATIBILITY - Box Two Chainring - Box One Chromoly Chainring Bolts - Box One 7075 Alloy Chainring Bolts - Box Two 24mm bottom bracket - Box Extremum RacePrep bottom bracket

Our Box Two tier's mission in life is to deliver performance similar to the Box One but without its exotic (and costly) features. You still get the Tri-Pack Clutch in our derailleur only it isn't adjustable. The cassette's 11-50T range is equally impressive but we don't cut it out of a single block of steel. The action on the shifter is just as snappy although you don't get the rigid die-cast pull lever. The chain boasts the same unique ability to mate with a wide/narrow chainring except you give up the trick DLC top coat. You're hardly shortchanging yourself with Box Two.

Our Box Two tier's mission in life is to deliver performance similar to the Box One but without its exotic (and costly) features. With the Single Shift E-Bike Groupset you still get the Tri-Pack™ Clutch in our derailleur only it isn't adjustable. The cassette's 12-50T range is optimized for E-Bikes. The action on the shifter is limited to one downshift per lever swing. The chain boasts the same unique ability to mate with a wide/narrow chainring except you give up the trick DLC top coat. You're hardly shortchanging yourself with Box Two. INCLUDES - Box Two Prime 9 Single Shift Shifter - Box Two Prime 9 X-Wide Rear Derailleur - Box Two Prime 9 12-50T E-Bike Cassette - Box Two Prime 9 126L Chain Nickel - Box One Shift Cable & Housing Kit

All Box One forks are engineered and crafted using our Oversized Technology. These forks are the single most crucial component in the quest for bike control. We’ve moved carbon from areas of low stress to areas that handle high loads. Those muscular shoulders aren’t just for looks, as they are integral to achieving superior steering stiffness. When combined with Box’s other Oversized components, you’ll experience heightened responsiveness and reduced latency. Key differences: This particular model fork is tailored for mid-sized racers and includes a lighter weight 1 inch 7000 series aluminum steerer tube and 10mm cold-forged dropouts. Weight Limit: 45 kg (99 lbs) or less with limitations as per Category 1 of EN 16054:2012 Standard FEATURES - 7075-T6 Aluminum Standard 1” Steerer Tube to Accommodate Mid-Sized Racers - Designed for 10mm Axle Conventional Hubs - Internal Butterfly for Added Durability at Steerer Tube and Fork Crown Interface IMPORTANT NOTES - Includes Box One™ Stem Lock - Note: Use of a star nut voids the warranty for this product. COMPATIBILITY - Box One Stem Spacers - Box Two Stem Spacers - Box Two Threadless Headset - Box Two 1" Integrated Headset - Box Two 1" Integrated Conversion Headset - Box Two Headset Adapters - Box Two Top Load 1" Stem - Box Hex Lab 1" Stem - Box Two Center Clamp 1" Stem

All Box One forks are engineered and crafted using our Oversized Technology. These forks are the single most important component in the quest for bike control. We’ve moved carbon from areas of low stress to areas that handle high load. Those muscular shoulders aren’t just for looks as they are integral to achieving superior steering stiffness. When combined with Box’s other Oversized components, you’ll experience heightened responsiveness and reduced latency. Key differences: This particular model fork is tailored for larger-sized racers and therefore includes a lightweight 1-1/8 inch 7000 series aluminum steerer tube and 10mm cold-forged dropouts. Weight Limit: 115kg (253 lbs) with limitations as per Category 2 of EN 16054:2012 Standard FEATURES - 1-1/8 Inch 7000 Series Aluminum Steerer Tube - Standard Size Fork for Larger-Sized Racers - Internal Butterfly Steerer Tube and Fork Crown Interface - 10mm Standard Dropouts - Cold-Forged and Bonded Dropouts COMPATIBILITY - Box Two 1.1/8" Integrated Headset - Box One Carbon 45x45 1.1/8" Integrated Headset - Box Two Threadless Headset - Box Two Headset Spacers - Box One Front Load Stem - Box One Top Load Stem - Box Two Front Load Stem - Box Two Top Load Stem - Box One Delta Stem - Box One Center Clamp Stem - Box Two Center Clamp Stem SPECIFICATIONS - 20 Inch 24 Inch - Material High Modulus Unidirectional Carbon Fiber Construction - Steerer Material 7000 Series Aluminum - Finish High Gloss Black - Offset 32mm - Steerer Tube 1-1/8 Inch - Weight - 20": 560g / 19.75oz - 24": 585g / 20.7oz