Box Four 8 Speed Wide Rear Derailleur Size:Wide Cage These are the same axles

These are the same axles included with the 20-millimeter Hollow hubset

The tooth profile and thicknesses are tailored to match the inside geometry of the unique Box Four chain

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

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

Including a Limited Slip Clutch

Box Four 8 Speed Wide Rear Derailleur Size:Wide Cage These are the same axlesThe 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