Engineered from high-grade 6061 billet aluminum, these secondary sheaves eliminate the structural deficiencies found in factory cast units. The meticulously calibrated sheave angle creates optimal belt interface geometry, delivering superior traction and immediate throttle response. Our advanced helix rollers demonstrate exceptional durability, substantially outperforming OEM components under demanding conditions. Fully compatible with stock primary clutches while accommodatingonly aftermarket helixs. Important: Current component availability requires reuse of your original hub insert. Select either our professional core exchange with complete assembly service or receive unassembled sheaves for self-installation on your existing steel hub.