USD $‎199.99

Box Three Prime 9 X-Wide Single Shift Groupset

PREORDER NOW // SHIPPING DECEMBER

FEATURES
• Prime 9™ Technology
• Simple
• Durable
• Performance

SPECIFICATIONS
• Matte Black Finish 
• Glass Fiber / Nylon Composite, Steel, Aluminum 
• Hardened Alloy Steel Hardware
• Cogs: 11 • 13 • 16 • 20 • 24 • 30 • 36 • 42 • 50

SKU: BX-DT3-P9ASXW-KIT
Prime 9 Technology is a counter-intuitive philosophy based on the less is more theory. It embraces range without adding complexity. The outcome is fewer parts, reduced weight, and increased durability.

  • Durable
  • Simple
  • Performance
  • More time on the bike; less time in the shop.
  • Less shifts to get to the best available gear.
  • Prime 9 uses a proven 9 speed drivetrain platform, but integrates modern technology.
  • 1x instead of 3x.
  • Limited Slip Clutch™.
  • Compatible with modern Wide / Narrow chainrings.
  • Added range without adding gears.
  • Consistent gear jumps.
  • Optimized shift up and shift down ramps.
  • Straighter Chain-line

    Prime 9 drivetrains significantly reduce the chain angle in the lowest gears when compared to 12 speed. This allows the chain to run straighter across all gears, increasing the life of the chain and cassette.

    Fewer Gears (less shifts)

    Fewer gears means less shifts to get to the gears you’d like to be in. This decreases the amount of shifts per ride and increases the life of the shifter and cassette.

    Single Shift Option (E-MTB)

    E-MTB drivetrains can fail when shifts across multiple gears occur under load. These failures are eliminated by restricting the shifting action to one shift at a time. This also increases the life of the drivetrain overall.

    Full Steel Cassette (all tiers)

    Prime 9 Cassettes offer full steel construction at all levels. This significantly increases the durability of the cassette. No more issues with your climbing gears wearing before the others!

    Unique 9 Speed Chain

    Prime 9 chains have internal dimensions that are compatible with modern Wide / Narrow chainrings and similar chain retention to 11 / 1 2 speed chains. Externally, Prime 9 chains have dimensions similar to existing 9-speed chains. This unique geometry allows for thicker side plates than 12-speed drivetrains which resists stretching over time, increasing shifting performance while decreasing wear on the cassette and chainring.

    Straighter Chain-line

    Prime 9 drivetrains significantly reduce the chain angle in the lowest gears when compared to 12 speed. This allows the chain to run straighter across all gears, increasing the life of the chain and cassette.

    Fewer Gears (less shifts)

    Fewer gears means less shifts to get to the gears you’d like to be in. This decreases the amount of shifts per ride and increases the life of the shifter and cassette.

    Single Shift Option (E-MTB)

    E-MTB drivetrains can fail when shifts across multiple gears occur under load. These failures are eliminated by restricting the shifting action to one shift at a time. This also increases the life of the drivetrain overall.

    Full Steel Cassette (all tiers)

    Prime 9 Cassettes offer full steel construction at all levels. This significantly increases the durability of the cassette. No more issues with your climbing gears wearing before the others!

    Unique 9 Speed Chain

    Prime 9 chains have internal dimensions that are compatible with modern Wide / Narrow chainrings and similar chain retention to 11 / 1 2 speed chains. Externally, Prime 9 chains have dimensions similar to existing 9-speed chains. This unique geometry allows for thicker side plates than 12-speed drivetrains which resists stretching over time, increasing shifting performance while decreasing wear on the cassette and chainring.

    Straighter Chain-line

    Prime 9 drivetrains significantly reduce the chain angle in the lowest gears when compared to 12 speed. This allows the chain to run straighter across all gears, increasing the life of the chain and cassette.

    Fewer Gears (less shifts)

    Fewer gears means less shifts to get to the gears you’d like to be in. This decreases the amount of shifts per ride and increases the life of the shifter and cassette.

    Single Shift Option (E-MTB)

    E-MTB drivetrains can fail when shifts across multiple gears occur under load. These failures are eliminated by restricting the shifting action to one shift at a time. This also increases the life of the drivetrain overall.

    Full Steel Cassette (all tiers)

    Prime 9 Cassettes offer full steel construction at all levels. This significantly increases the durability of the cassette. No more issues with your climbing gears wearing before the others!

    Unique 9 Speed Chain

    Prime 9 chains have internal dimensions that are compatible with modern Wide / Narrow chainrings and similar chain retention to 11 / 1 2 speed chains. Externally, Prime 9 chains have dimensions similar to existing 9-speed chains. This unique geometry allows for thicker side plates than 12-speed drivetrains which resists stretching over time, increasing shifting performance while decreasing wear on the cassette and chainring.

    Same Range With Fewer Gears

    11-50 tooth cassette with only 9 gears

    Ease of Set-up

    A 9-speed drivetrain has a larger adjustment window than a 12 speed. This makes Prime 9 easier to set-up, more likely to stay in adjustment and less finicky over time.

    Less Maintenance

    More durable and easier to setup when compared to 12 speed drivetrains. Prime 9 provides more time in between recommended service intervals so you can spend more time riding!

    Wide Compatibility

    No proprietary freehub body, no proprietary chainring, and fewer issues with chainline make Prime 9 a perfect fit on any bike!

    Don’t Worry, All Bike Shops Are Familiar With 9 Speed Platforms!

    3 x 9 drivetrains have been around for 2 decades making a Prime 9 familiar to any bike shop or mechanic for easy conversions, setups and adjustments!

    Shifting Less Means Faster Riding

    Less shifts to get to the best available gear when compared to 12 speed. More time pedaling means faster runs and more King of the Mountain titles (KOMS)!

    Limited Slip Clutch™ Means Better Chain Retention

    Instant engaging, constant torque, fully serviceable* and a fully adjustable* clutch means less chain slap, better chain engagement and no dropped chains. (*available only on box one / two tiers)

    Optimized Shift Ramps

    Wide range cassettes with fewer gears means larger gear jumps. Our shift ramps are optimized specifically for these gear combinations creating consistent, solid shifts every time.

    Consistent Gear Jumps

    Prime 9 cassettes feature consistent gear spacing which provides even cadence across the cassette’s range.

    Lightweight Cassette

    Fewer cogs compared to 12 speed make for a lighter cassette* and better performance in all scenarios. (*Box One Prime 9 compared to other 12 Speed cassettes)

    9 speed has deep roots in cycling and has been around in various configurations dating back to the late ’90s, however, these configurations were almost always “3x” drivetrains consisting of a front derailleur with 3 gears and an on-clutch rear derailleur with a small range, 11-34 cassette. Prime 9 is unique in that it combines much of the durability and reliability of the traditional 3 x 9-speed drivetrains with the simplicity of modern 1x drivetrains. This creates a bomb-proof drivetrain that is easy to set up and has a simple user experience.

    Prime 9 chains have internal dimensions that are compatible with modern Wide / Narrow chainrings and perform similarly to 11 / 1 2 speed chains. Externally, Prime 9 chains have dimensions similar to existing 9 speed chains. This unique geometry allows for thicker side plates than 12-speed drivetrains which resists stretching over time increasing shifting performance while decreasing wear on the cassette and chainring.

    More does not always mean better, and we believe that 9 is Fine!

    An 11 to 50 tooth range is a large spread to cover over 9 g ears, but we have tuned the gear ratios to have consistent cadence throughout the cassette range. This along with our optimized shift ramps makes for a smooth experience for any rider.

    9-speed chains have been used on drivetrains for decades. To this day they are commonly seen on some of the most torturous bike styles such as touring bikes, meant to last 1000s of miles under extreme conditions. This long-standing reputation for durability easily trumps the potential savings of a few grams, especially on arguably the most important part of the drivetrain.

    Note: Other 9 speed chains are compatible with the Prime 9 derailleurs and cassettes but may increase the possibility for dropped chains, we recommend using a Box Prime 9 Chain for optimal performance!

    There are a number of benefits of an 11 tooth cassette design when compared to a 1 0 tooth. Prime 9 utilizes the 11 tooth design for two main reasons; Having more teeth allows for a m ore evenly distributed load from pedaling torque, increasing both cassette and chain life. Additionally, choosing an 11 tooth design allows Prime 9 Cassettes to be compatible with the most popular freehub body in the industry.

    If you have any questions that we haven’t addressed please let us know!

    All Prime 9 cassettes utilize standard 9 / 10 / 11 speed HG Freehub Bodies.

    Prime 9 chains have internal dimensions that are compatible with modern Wide / Narrow chainrings.Wolf Tooth, One Up and Absolute Black (amongst others) make great chainrings that are compatible with Prime 9 drivetrains!

    Almost all bikes have an acceptable chainline for Prime 9 d rivetrains; technically speaking, the ideal chainline is 50-53mm. For MOST setups, we recommend using a boost chainring which offers less offset and provides better shift performance.

    Prime 9 chains have internal dimensions that are compatible with modern Wide / Narrow chainrings and perform similarly to 11 / 1 2 speed chains. Externally, Prime 9 chains have similar dimensions to existing 9 s peed chains. This unique geometry allows for thicker side plates than 12 speed drivetrains which resists stretching over time increasing shifting performance while decreasing wear on the cassette and chainring

    Note: Other 9 speed chains are compatible with the Prime 9 derailleurs and cassettes but may increase the possibility for dropped chains, we recommend using a Box Prime 9 Chain for optimal performance!

    If you plan to ride in very rough muddy conditions, we recommend a chain guide or chain keeper. Without these precautions, you may experience chaindrops and / or chainsuck.

    If using Box Prime 9 Drivetrain, please use Box Prime 9 chains for best performance and chain retention. Using non-recommended chains may lead to chain dropping and / or noise.

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