Box One Prime 9 X-Wide Multi Shift Groupset


599.95 $ 626.99

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The Box One tier is for those of you who just aren't satisfied with anything but the BEST! You like to get up there where the air is thin and the details matter. Every single cog on the 11-50T cassette is steel, yet it barely tips the scale at 360 grams; along with the chain, its surface is Dual-coated with DLC + Nickel and is both beautiful and durable. Your thumb will push a textured die-cast lever on a shifter that's had its hinged clamp whittled away by our CNC machines. Let's finish this package off with a derailleur that flaunts a Fully Adjustable Tri-Pack Clutch and super smooth sealed bearing pulleys. Pamper yourself a little; you know you deserve it!

  • BOX's Best Performing Drivetrain
  • For Aggressive Terrain
  • Steel Lightweight Unibody Construction
  • Lightweight Alloy Internal Support Disc
  • Ultra-Wide Ratio with Consistent Progression
  • Durable Dual-Coating DLC & Nickel Protection
  • Prime 9™ Technology
  • Install at Home with Some Simple Bike Tools and Our Easy to Follow Video
  • Compatible with HG Freehub Bodies
  • Compatible with Standard Derailleur Hangers (Non Direct-Mount)
  • Compatible with most 10,11, & 12-speed wide / narrow chain rings. Prime 9 chain must be used.
  • Not Intended for Ebike Use
View Prime 9 Drivetrain Compatibility Manual
View Prime 9 Comparison Chart
Why Prime 9?


Q: What is the difference between the Wide and X-Wide?
A: The Wide cassette offers an 11-46T range while the X-Wide offers an 11-50T range.



  • Model: Box One Prime 9
  • Range: 11-50t
  • Shifter: Multi-shift