Box Four Prime 9 Cassette (Black) (8 Speed) (Shimano/SRAM) (11-42T)

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While everyone else keeps adding more and more gears, the Box Four Prime 9 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 8 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.


  • Prime 9 Technology offers fewer gears with wider spacing to ease set-up, provide a better chain line, and result in less wear and tear
  • Ultra-wide ratio with consistent progression and fits standard HG freehub bodies (Not compatible with XD or Microspline)
  • Box Four features 8 speeds with Prime 9 Technology

Speeds: 8
Range: 11-42T
Cogs: 11-13-16-20-24-30-36-42
Freehub Body: Standard HG (Shimano/SRAM)
Color: Black
Weight: 475g

This product was added to our catalog on November 9, 2020

Box Prime 9 Model Comparison