Box Four 8 Speed Wide Rear Derailleur Color:Black providing superior performance in any

providing superior performance in any conditions

Lockring & Cogs replacement for Box Two Prime 9 EBIKE cassettes

and chain paired to the durable Box Two cassette

The Box Two chain's nickel plating adds both corrosion and wear-resistance

Box Four 8-Speed 12-42T E-Bike Cassette

Box Four 8 Speed Wide Rear Derailleur Color:Black providing superior performance in anyThe Box Four Rear Derailleur is the base of Prime 9 Technology that offers an affordable clutch based 1 by 8 speed derailleur that is simple and light; this makes it a perfect candidate for every entry level bike that traditionally has a 3 by drive train that is neither durable nor user friendly. SUPPORT MATERIAL Prime 9 Technology View Prime 9 Drivetrain Compatibility Manual How is the Ebike variant different? View Prime 9 Comparison Chart View Prime