DER BOX RR TWO 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, not compatible with other 11-50 cassettes

Same functions as the Box One Prime 9 derailleur with more affordable materials

Glass fiber/nylon composite, steel, aluminum alloy

Tri-Pack limited slip clutch

Forged inner and outer cage

Pivot-Tech cable stay

Precision sealed bushing pulleys