The Box One Prime 9 Rear Derailleur takes the advantages of our legacy 9-speed drive-train but adds the advancements of a modern 1 by; a fully adjustable Tri-Pack™ Clutch, and an x-wide cage optimized for an 11-50T cassette. Forged construction steps up the durability and performance to an unparalleled level. Suited for the most demanding terrain.

IMPORTANT NOTES

Prime 9 Technology™
View Prime 9 Drivetrain Compatibility Manual
How is the Ebike variant different?
View Prime 9 Comparison Chart
View Prime 9 E-Bike Comparison Chart

Our Best Performing Derailleur
For Aggressive Terrain
Adjustable Tri-Pack™ Limited Slip Clutch
Precision Sealed Bearing Pulleys
Pivot-Tech™ Cable Stay

BOX ONE PRIME 9 X-WIDE REAR DERAILLEUR BLACK