This is the optional Yokomo "Narrow" Rear Drive Belt. This belt is about 6mm wide where the standard belt is about 7.5mm. This belt will greatly reduce rear friction in the drivetrain, and is an especially good option for stock racing.
Use this belt stand-alone, or as a replacement for the Aluminum Narrow Rear Pulley & Belt Set (YOKZ4-309C).
This product was added to our catalog on January 20, 2016