Box Three Prime 9 Groupset (9 Speed) (X-Wide Cage) (Multi Shift) (11-50T)

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Price: $214.99

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While everyone else keeps adding more and more gears, the Box Three Prime 9 X-Wide Multi Shift Groupset takes a different approach. The engineers at Box decided that sometimes simple is better so they developed a groupset with a wide ratio range over only 9 cogs. The benefit is that fewer gears reduce the chain angle on the low end; making the chainline more direct across the whole range; improving component longevity and power transfer. The 2-piece multi-shift lever allows for shifting of 3 gears at a time. The rear derailleur boasts a limited slip clutch with instant engagement and constant torque which prevents dropped chains and minimizes chain slap. The Prime 9 chain is compatible with modern narrow/wide chainrings.


  • Cassette (11-50 Tooth)
  • Rear Derailleur 
  • Shifter
  • Chain

Cassette Cogs: 11-13-16-20-24-30-36-42-50
Cassette Body Type: Shimano/SRAM (Not Compatible with XD or MicroSpline)
Rear Derailleur Speeds: 9-Speed
Rear Derailleur Max Cog: 50T
Rear Derailleur Cage Length: Long
Rear Derailleur/Shift Compatibility: Box Prime 9
Shifter Style: Thumb
Shifter Speeds: 9-Speed Multi-Shift
Color: Black
Groupset Weight: 1354g

This product was added to our catalog on July 8, 2020

Tony Shephard
Verified Owner
Saturday, Sep 4 2021 (about 2 years ago)
Box Three Prime 9 Groupset (9 Speed) (X-Wide Cage) (Multi Shift) (11-50T)
Pretty good set up for the money.
Shipping was fast and free
All components were packaged well
Components seem of quality material and workmanship
Install was straight forward and pretty simple
Shifts smooth even when riding hard
Minimal chain slap

Given that this is offered as a boxed set, it should have also included the cable sheath - a menial cost for the manufacture, but can be a big deal to the novice bike guy excited to upgrade his bike only to realize he cannot until he orders a cable sheath. “It’s the small things that make a difference” ;)
No stickers?? Come on performance bike! Everyone likes stickers :)

Overall, really nice package. I’d buy again and will refer folks in my MTB club. Thanks for the great product!
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