BOX REAR FOUR PRIME 9 8s X-WIDE BLACKThe 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 Perfect candidate for every entry level bike that traditionally has a 3 by drive train that is neither durable nor user friendly For those seeking an affordable way into the world of 1x drivetrains on an otherwise entry level platform Features Box`s Limited Slip Clutch, durable nylon composite knuckle
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