DER BOX RR THREE PRIME 9 9s X-WIDE BK

Prime 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 channal cable stay