BOX REAR THREE PRIME 9 9s X-WIDE BLACKPrime 9 Technology is a counter intuitive philosophy based on the less is more theory it embraces range without adding complexity Intended for use with Box Components` Prime 9 speed group, no compatible with other 11 50 cassettes Similar design as the Box Two Prime 9 derailleur with more affordable materials Glass fiber nylon composite, steel and aluminum construction Limited slip clutch Stamped inner and outer cage Standard bushing pulleys Direct
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