Mazda 12A & 13B Underdrive Alternator Pulley sr20 water Please have a look at

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so we include an offset spacer to relocate the knock sensor & a plain spacer if not required

Precision-machined body from 6061 aluminium

The design that started it all the OG

Suits early 12A and 13B rotaries through to series 5 RX-7 (vehicles with 15 mm alternator shaft)

Mazda 12A & 13B Underdrive Alternator Pulley sr20 water Please have a look atLightweight alternator 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 75mm. Suits early 12A and 13B rotaries through to series 5 RX 7 (vehicles with 15 mm alternator