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.