box-one-tri-pak-clutch-kit
box-one-tri-pak-clutch-kit, Replacement Tri-Pack(TM) clutch assembly for Box One derailleurs Tri-Pack(TM) technology. This is an upgrade kit for Box two derailleurs as well. This is compatible with Box One and Two 11 speed, 7 speed, and Prime 9 derailleurs that currently have the Tri-Pack(TM) system.