Box Two Prime 9 X-Wide 9-Speed Rear Derailleur

The Box Two Prime 9 Rear Derailleur is very similar to the Box One version however, to be more wallet-friendly, it offers a non-adjustable Tri-Pack Clutch, bushing pulleys and some muted finishes. Box Two rear derailleurs are still optimised for 11-50 Tooth cassettes and offer durability and performance for the most demanding terrain, just at a lower price!

Technology

Prime 9

Prime 9 technology is a counter-intuitive philosophy based on the less is more theory. It embraces range wihtout adding complexity. The outcome is fewer parts, reduced weight, and increased durability.

Is Prime 9 Simpler?

• Same Range With Fewer Gears
• Ease of Set-up
• Wide Compatibility
• Less Maintenance
• Don’t Worry, All Bike Shops Are Familiar With 9-Speed Platforms!

Is Prime 9 More Durable?

• Straighter Chain-line
• Unique 9-Speed Chain
• Single Shift Option (E-MTB)
• Fewer Gears (fewer shifts)
• ​Full Steel Cassette (all tiers)

Does Prime 9 Perform Better?

• Shifting Less Means Faster Riding
• Optimised Shift Ramps
• Consistent Gear Jumps
• Lightweight Cassette

Features

• Box's Most Durable Derailleur
• For Aggressive Terrain
• Tri-Pack Limited Slip Clutch
• Sealed Bushings Pulleys
• Pivot-Tech Cable Stay

Specification

• Process/Material:
• B-Knuckle: 3D Forged / Aluminium
• P-Knuckle: Injection Molded / Glass-Nylon Composite
• Linkages: 3D Forged / Aluminium
• Cage: Forged / Aluminium
• Finish: Matt Hard Onyx
• Speeds: 9
• Compatibility
• Platform
• E-Bike
• Non-E-Bike
• Shifter
• Box Two Prime 9
• Box Three Prime 9
• Derailleur Hanger: Non-Direct Mount
• Weight: 290g /10.2oz

Compatibility

• Box One Prime 9 11-50t and Also 12-50t E-Bike Cassette
• Box Two Prime 9 11-50t and Also 12-50t E-Bike Cassette
• Box Three Prime 9 11-50t and Also 12-50t E-Bike Cassette
• Box One Prime 9 126 Link Chain Dlc
• Box Two Prime 9 126 Link Chain Nickel
• Box Three Prime 9 126 Link Chain Polished
• Box One Prime 9 Shifter
• Box Two Prime 9 Shifter
• Box Three Prime 9 Shifter