Box Four 8 Speed Wide Rear Derailleur Size:Wide Cage the Box Four shifters take

the Box Four shifters take advantage of the "less is more" theme and exploit durability

Box One™ Chain Tensioners are extruded then CNC-machined from 7075 aluminum for an optimal balance of strength and weight

Including a Limited Slip Clutch

There are also the "Compact" variations that are fitted out with upright shift levers

you can also use your custom number plate sticker so you can always find your bike stand in the pits

Box Four 8 Speed Wide Rear Derailleur Size:Wide Cage the Box Four shifters takeThe 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