BTom Hayden Ent M6 CHAIN TENSIONER 01 HARLEY BIG TWIN '01 M6-BT01 ReviewbP PP Tom Hayden Ent M6 CHAIN TENSIONER 01 HARLEY BIG TWIN '01 M6-BT01 PAutomatically adjust the tension of the primary chainPProvide constant and even tension, which improves gear shiftingPReduce shifting noise; makes for a smoother ridePExtend primary chain lifePMade in the USAP