Mazda 12A & 13B Underdrive Pulley Set

Lightweight pulley set made from aircraft-grade 6061-T6 aluminium for light weight, and black anodised for great looks.

Set contains: crank pulley, alternator pulley and waterpump pulley.

Offers faster acceleration through significant reduction of mass having to be accelerated by the crankshaft. The effect is similar to a lighter flywheel, and the car feels more lively and willing to rev.

Crank pulley outside diameter is 88mm.
Alternator pulley outside diameter is 75mm.
Waterpump pulley outside diameter is 130mm.

Suits early 12A and 13B rotary, not S4, S5 or later engines.

The pulleys are also available individually, please check our other listings.