The bearings on the factory belt sensor are non-serviceable. They are known to seize and either destroy the belt sensor, or worse yet the belt itself.
This upgraded pulley is made from anodized Aluminum and replaces the factory plastic pulley. The bearing is fully serviceable should it ever wear out. We use a SKF sealed bearing that is rated to 80,000 RPM as pulley can spin upwards of 30,000 RPM at redline.
Bearing, stainless steel bolt and locknut are included.