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

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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

Verified Owner
Wednesday, Jun 9 2021 (7 weeks ago)
Box Three Prime 9 Groupset (9 Speed) (X-Wide Cage) (Multi Shift) (11-50T)
So far so good on the groupset. The Box Three Prime 9 was easy to install and set up, and my son is liking it a lot so far. The reason for 4 starts is that the downshift lever is really pretty stiff to actuate. Other than that, we are very happy with the Box products.
Box Prime 9 Model Comparison