Mazda 12A & 13B Underdrive Crank Pulley

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

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 

Pulley outside diameter is 88mm 

Suits early 12A and 13B rotaries through to Series 5 RX-7