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BMW Drive Belts & V-Belts

Your BMW's drive belts are wear items, and will degrade and crack over time. Don't wait until you have a belt failure... don't get stranded! Replacing your BMW's belts, such as the alternator belt, power steering belt, air conditioning AC belt, or serpentine belt is a low cost insurance policy to preventing a break down -- or worse, engine damage. We recommend checking your belts every 10,000 miles. If your belts have excessive cracks, dry rot, missing teeth and/or grooves, are cause noise, it's time for new ones.

While also inspecting your serpentine belts, also check for wear or resistance in the pulleys. The tensioner pulley and deflection pulley are the primary sources for belt squealing. The rubber-isolated pulleys can also break apart, leading to total belt failure. We sell the tensioner and deflection pulleys for the M50 engine family used in the E34, E36, E39, E46, X5, Z3, and Z4.

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M7 Lightweight Crank Pulley - 4% Overdrive - R52 / R53
M7 Lightweight Crank Pulley - 4% Overdrive - R52 / R53
M7 Speed - Corporate Logo
T#:584439
Part#: 53-3M7101-4
Back Ordered
Sale - Save 5% $ 159.99

This product was last offered at the strikethrough price on
08-31-2026

$ 151.77 USD
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Sale - Save 5%
$ 159.99

This product was last offered at the strikethrough price on
08-31-2026

$ 151.77 USD
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M7 Speed 4% Oversize Crankshaft Pulley for MINI Cooper

Unlocking Performance

The M7 Speed 4% oversize crankshaft pulley is your ticket to unlocking the hidden potential of your MINI Cooper. This performance-enhancing pulley is designed to add power, acceleration, and overall performance to your beloved MINI. Here's how it does the trick:

Performance Boost:

  • Safely speeds up your supercharger, delivering a significant "low end" boost and torque.
  • The result? Your MINI Cooper takes off with newfound energy and responsiveness.

Lightweight Advantage:

  • Weighing just 13 ounces, this pulley is a remarkable 88.5% lighter than the factory version.
  • Reduced crankshaft rotational mass equals more horsepower, torque, and improved throttle response.

Advanced Design

The M7 Speed 4% Crank Pulley isn't just about performance; it's also a work of art. Crafted with advanced computer modeling and precision CNC machining, it's a blend of form and function:

Materials:

  • Made in the USA from billet 6061-T6 aerospace-grade aluminum alloy.
  • Features a deep black anodized coating and laser etching for a sleek look.

Precision Machining:

  • Micro V-Belt grooves meet SAE J1459 specifications to minimize belt slippage, especially at maximum boost.

Optimal Fit:

Use it in conjunction with the M7 Speed 16% Supercharger Technology Pulley for peak performance in MINI tuning.

Reliable Performance

From the factory, MINI lacks a positive drive key on the crankshaft snout to drive the lower pulley. Most aftermarket pulleys are slip-fit and rely on the bolt to prevent slippage. The M7 Speed crank pulley is engineered differently:

Interference Fit:

The pulley is interference-fit onto the crankshaft, ensuring zero slippage even at high RPMs.

Features at a Glance:

  • Super Lightweight: Only 13 ounces (0.3 kg)
  • Sheds 6.2 lbs (2.8 kg) compared to stock
  • Achieves perfect balance through a symmetric design and precision machining
  • Includes a high-quality ARP Racing bolt and precision ground flat washer
  • Installation is a breeze

Unleash Your MINI's Potential

Proudly made in the USA, the M7 Speed 4% Oversize Crankshaft Pulley is the upgrade your MINI Cooper deserves. Unleash its hidden power and enjoy a new level of performance, reliability, and overall driving pleasure. Get ready to experience the difference.

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MINI R52 R53 M7 Gen 1 Power Up Kit - Supercharger Overdrive Pulley Kit
MINI R52 R53 M7 Gen 1 Power Up Kit - Supercharger Overdrive Pulley Ki...
M7 Speed - Corporate Logo
T#:1150752
Part#: 53-3M7700-1
In Stock
Sale - Save 5% $ 368.99

This product was last offered at the strikethrough price on
08-31-2026

$ 350.12 USD
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Sale - Save 5%
$ 368.99

This product was last offered at the strikethrough price on
08-31-2026

$ 350.12 USD
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High Performance Engine Power Kit For Gen 1 MINI S
High Performance Engine Power Kit For Gen 1 MINI S
M7 Speed - Corporate Logo
T#:50276469
Part#: 53-3M7702-10
Ships in 2 Business Days
Sale - Save 5% $ 440.99

This product was last offered at the strikethrough price on
08-31-2026

$ 418.10 USD
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Sale - Save 5%
$ 440.99

This product was last offered at the strikethrough price on
08-31-2026

$ 418.10 USD
Add to Wish List

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