Alta 15% or 17% Supercharger Reduction Pulley for 2002-2006 MINI Cooper S

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Add 20+ Wheel HP to your MINI Cooper S!

Constructed of light weight 6061T6 aluminum, the ALTA SC pulley body decreases rotational inertia of the supercharger adding response to your engine. Holes are cross drilled through the pulley and over each groove, to increase belt grip and reduce belt slippage as your belt stretches. 

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20 Items


$130.00 per 1

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The ALTA Performance Supercharger pulley features a stainless steel coupler which clamps onto the supercharger shaft rather than wedging in place like other aftermarket pulleys. ALTA was the first pulley to use this clamp-on method, and it has proven to grip the supercharger shaft better than other aftermarket pulleys and it will work for those who have had other pulleys slip and cause damage to the supercharger shaft. Our hub will attach to supercharger shafts that have been worn down as much as .020" and still work perfect! Additionally, the ALTA coupler features an open installation site aperture in end of our shaft coupler which allows you to visibly verify that the shaft collar is fully seated to the supercharger shaft. 

The black outer pulley is machined on a lathe from solid billet aluminum. Since this part is perfectly symmetrical it is naturally balanced in its self. The non-symmetrical hub adapter must be balanced to offset the weight of the clamping bolts and slit. In the machine shop we balanced our prototype pulley to within .1 grams at 16000RPM (even better than stock). Data from that balancing was added to the model and applied to all production parts ensuring the entire part is balanced. Also incorporated into the design are over-sized belt retainers, which reduces belts from jumping off. 

15% or 17% Reduction Size?

  • 15% Reduction: This reduction size is the market standard and produces smooth, safe power increases of around 20WHP. Recommended for cars that will see track use or spend extended periods of time at high RPM.
  • 17% Reduction: Produces more boost, but also produces more heat. Recommended for street performance. Similar horsepower gains.

Either pulley needs a new (shorter) belt. (Sold separately, see accessories below.)

ALTA Performance warrants to the original purchaser, all ALTA products to be free from defects in material and workmanship within a sixty (60) months period from the date of purchase. 

See our other listings for puller tools.