Simply the best reduction pulley you can buy for the first generation MINI Cooper S (R53)!

Add 20 hp to your MINI.

Box Includes: CravenSpeed 17% Supercharger Reduction Pulley with hub adapter and four bolts

• Smaller SC pulley spins faster
• Faster spin increases boost
• More Boost increases acceleration
• Easy Installation

Safe for Extended Use

CravenSpeed's supercharger pulleys are machined to a specific reduction of the original equipment on your MINI's supercharger. It is widely accepted that these sizes are safe amount of reduction on this particular supercharger. Smooth, form fitting teeth on your pulley take longer to machine but are worth the extra time. CravenSpeed pulleys will neither eat nor throw your belt. You can be confident your belt will last long, and run quietly. We do recommend using a slightly smaller belt with these reduction pulleys. 

15% or 17%?

If both sizes are safe for the supercharger which one should you choose? The supercharger is only creating boost under acceleration, on a normal or even a spirited drive this is only occasional. However, at the track or an autocross event acceleration is sustained and frequent. If you use your MINI for these types of events, it is better to use the 15% reduction pulley. This is because the 17% pulley causes the supercharger to heat more rapidly and the warm air begins to negate the positive effects of the extra PSI earlier in the band.

Will it work on my car?

This pulley kit will work on all supercharged MINI models including the JCW which has a 12% reduction pulley on the supercharger from the factory. Special sized puller required to remove the stock JCW pulley (not included).

Serpentine Belt

Gates belt K060535 is recommended for all 15% and 17% pulleys (not included). Change your belt when you change your pulley and every 25,000 miles thereafter.

Instructions: See the card included in the pulley box for a link to instructions on the CravenSpeed website.

Note: California residents – for off-road use only.  Check your local legal requirements if in a CARB compliant state. 

See our other listings for more CravenSpeed and Alta Performance products.