BOX REAR TWO 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, 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
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