The Monster OAD™ is the first OAD™ to the transit market. The Monster OAD™ is an 8 groove serpentine pulley specifically designed to eliminate systemic belt drive failures known to exist on every transit OEM engine platform.

The Monster OAD™pulley has two primary functions that eliminate belt drive issues. First, the pulley has an overrunning feature that allows the alternator rotor to dissipate its inertia by overrunning.

Te second and most important feature of The Monster OAD™ is it's ability to absorb the torsional vibration created by the engine.