an updated EVOL air spring

BSA - 73mm or 68mm threaded frames

174-180MM M12X1

Weight: Approx 117gms

BOX One Prime 9 Speed X-Wide Derailleur - 9 Speed PLP|EMTB Optimised an updated EVOL air springBOX shook up the drivetrain market with the release of their wide range 9 speed drivetrains. The prime 9 derailleurs are built for 11 50t cassettes without all the headaches of adjusting 12 gears. The Box One Prime 9 rear derailleur is Box's top of the range Prime 9 offering with all the bells and whistles. It features an adjustable clutch, precision sealed bearing pulleys and a fully forged construction. Who's this item for: Anyone already running a