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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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E9X M3 Performance Underdrive Pulley Kit

T#:593749

Part#: 10.00.011

In Stock

$ 349.00 USD

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$ 349.00 USD

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Free additional power to your M3’s rear wheels without sacrificing or compromising your BMW’s reliability. Machined from 6061-T6 aerospace aluminum, Macht Schnell Performance Underdrive Pulleys are strong as well as lightweight to limit parasitic drag from the accessories within a moderate level for maximum performance on or off the track. After machining and engraving, pulleys are then T3 hard anodized for additional strength, anti-corrosion & wear resistance. Our DualDrive design replaces the Crank Accessory & Power Steering Pulleys, resulting in an additional 9-14 HP and 7-9ft. lbs TQ gain for the M3. Gains are due to a reduction in power required to turn accessories; an increase in accessories lifespan due to lower speed will also result. All factory harmonics/balancing are undisturbed. Macht Schnell Performance Underdrive Pulleys have no negative effect on accessory operation and comes fully equipped with new belts. Already have this kit and need new belts? See T#14491 and T#14489 Performance Underdrive Pulleys Features: DualDrive design allows maximum performance, with minor effect on accessory speed Proper cooling temperatures are retained at proper levels on or off the track Maintains proper alternator speed, allowing sustained levels to sensitive control modules Machined from 6061-T6 aerospace aluminum T3 Hard-Anodized for maximum strength and corrosion/wear resistance No affects to crankshaft dampening or harmonics Simple bolt-on installation

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Dinan Replacement Underdrive Pulley Belt For D560-0001 - Power Steeri...

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T#:21078443

Part#: D561-0005

Ships in 6 Business Days

Sale - Save 10% $ 63.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 57.56 USD

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$ 63.99

This product was last offered at the strikethrough price on
07-31-2026

$ 57.56 USD

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Replacement Belt for Underdrive Pulley Kit (D560-0001). This belt attaches to the power steering and air conditioner.

ARP Harmonic Damper Bolt Set - BMW S58

T#:49092362

Part#: ARP-CBS-S58

Ships in 4 Business Days

$ 134.99 USD

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$ 134.99 USD

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The OE crank bolts are grade 10 torque-to-yield bolts, designed for only a single use. For vehicles making stock power, the stock bolts are more than enough. Unfortunately, vehicles making more power than stock have experienced issues with the stock damper bolts coming loose and breaking, leading to engine and crank damage. 5150 AutoSport worked with ARP to create this ARP Harmonic Damper Bolt Set to address this issue. These upgraded bolts are stronger than the factory bolts and are designed to provide even repeatable torque load, preventing them from breaking and allowing them to be re-torqued as needed.

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Dinan Replacement Underdrive Pulley Belt For D560-0001 - Alternator/W...

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T#:21078444

Part#: D561-0006

Ships in 6 Business Days

Sale - Save 10% $ 63.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 57.56 USD

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Sale - Save 10%

$ 63.99

This product was last offered at the strikethrough price on
07-31-2026

$ 57.56 USD

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Replacement Belt for Underdrive Pulley Kit (D560-0001). This belt drives the alternator and water pump.

E9X M3 6/2008+ Dinan Underdrive Pulley Kit

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T#:389532

Part#: D560-0004

Ships in 6 Business Days

Sale - Save 10% $ 449.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 404.96 USD

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$ 449.99

This product was last offered at the strikethrough price on
07-31-2026

$ 404.96 USD

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Dinan Underdrive Crankshaft Pulley Kit - E60 M5, E63/64 M6 S85 5.0L ...

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T#:21078436

Part#: D560-0001

Ships in 6 Business Days

Sale - Save 10% $ 449.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 404.96 USD

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Sale - Save 10%

$ 449.99

This product was last offered at the strikethrough price on
07-31-2026

$ 404.96 USD

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Dinan's lightweight billet aluminum crankshaft pulley underdrives each of the accessories by 13 percent, reducing parasitic drag on the engine for a 6 HP @ 8000 RPM and 4 lb-ft torque @ 8000 RPM gain on a stock vehicle. The Dinan underdrive pulley retains the factory harmonic crankshaft damper, eliminating vibration that might otherwise damage the crankshaft. The kit includes all of the necessary mounting hardware, a lightweight pulley, and shorter belts. This product is backed by our industry-leading 4 year/50,000 mile warranty so you can rest assured that you are purchasing the best quality product for your BMW. Features: All accessories are underdriven by 13% to decrease drag on the engine. Lightweight billet aluminum crankshaft pulley, black anodized and engraved. Includes mounting hardware and shorter belts.

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BMW E9X M3 Replacement Belt For Underdrive Pulley Kit - (D560-0004) ...

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T#:586064

Part#: D561-0002

Ships in 6 Business Days

Sale - Save 10% $ 126.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 114.26 USD

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This product was last offered at the strikethrough price on
07-31-2026

$ 114.26 USD

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BMW E9X M3 Replacement Belt For Underdrive Pulley Kit - (D560-0004) is an essential component designed specifically for the Underdrive Pulley Kit. This belt is one of the two required for optimal performance of the kit.

Designed for Precision: Tailored to fit the BMW E9X M3 Underdrive Pulley Kit perfectly.
High-Quality Construction: Built to withstand the demands of high-performance driving.
Optimal Performance: Ensures smooth operation and reliable power delivery.
Easy Replacement: Simple to install, making maintenance straightforward.

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Replacement Belt For Underdrive Pulley Kit D560-0003 & D560-0004 ...

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T#:586065

Part#: D561-0007

Ships in 6 Business Days

Sale - Save 10% $ 95.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 86.30 USD

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$ 95.99

This product was last offered at the strikethrough price on
07-31-2026

$ 86.30 USD

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Water Pump/Alternator Accessory Belt Service Kit w/ Kevlar Reinforced...

T#:22097556

Part#: 6PK1548TKT

Ships on Aug 28, 2026

$ 129.99 USD

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$ 129.99 USD

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Eliminate your squeaking accessory belt pulley and cracked drive belt with this upgraded accessory belt service kit! This kit includes the ECS Kevlar Reinforced Accessory Belt, tensioner assembly, and your idler pulley. ECS Tuning's Red Kevlar Accessory Belts are both an aesthetic improvement and a performance alternative to a traditional belt. Kevlar-reinforced belts experience less elongation over time minimizing the amount of belt adjustment needed as well as offering a higher shock and impact resistance compared to OEM-style belts. Refreshing the rollers and/or tensioners simultaneously is a great way to ensure all vital components of your drive belt system are functioning optimally for years to come!

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M7 Lightweight Crank Pulley - Stock Size

T#:12774050

Part#: 53-3M7101-0

In Stock

$ 159.99 USD

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$ 159.99 USD

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M7 Lightweight Crank Pulley - 4% Overdrive - R52 / R53

T#:584439

Part#: 53-3M7101-4

In Stock

$ 159.99 USD

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$ 159.99 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 Ki...

T#:1150752

Part#: 53-3M7700-1

Back Ordered

$ 368.99 USD

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$ 368.99 USD

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Hex Bolt - N52, N54

T#:19792190

Part#: 11211439395

In Stock

Sale - Save 20% $ 18.99

This product was last offered at the strikethrough price on
05-03-2026

$ 15.19 USD

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$ 18.99

This product was last offered at the strikethrough price on
05-03-2026

$ 15.19 USD

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Replacement center bolt for the engine crank pulley.

Replacement Belt For Underdrive Pulley Kit D560-0003

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T#:586063

Part#: D561-0003

Ships in 6 Business Days

Sale - Save 10% $ 63.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 57.56 USD

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Sale - Save 10%

$ 63.99

This product was last offered at the strikethrough price on
07-31-2026

$ 57.56 USD

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High Performance Engine Power Kit For Gen 1 MINI S

T#:50276469

Part#: 53-3M7702-10

Ships in 3 Business Days

$ 440.99 USD

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$ 440.99 USD

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No Longer Available.

T#:396369

Part#: 12311311449KT

Ships on Sep 16, 2026

$ 1,696.99 USD

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$ 1,696.99 USD

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Group A racecars were the top of their class in both touring car and rally racing. Heavily modified and extremely fast these cars set out to demonstrate the best of what a manufacturer could do on the racetrack. It was the predecessor to the current DTM class racing and set a standard for many other divisions of motorsport to follow.

One of the weaker points of the S14 engine, when speaking from a racing standpoint is the belt drive system. While fine for a street going car, a V-belt is not suitable for high RPM applications. On the track, most of your time will be spent in the higher rev range which puts extreme amounts of stress on the factory setup. BMW realised this and came up with a solution that involved doing away with the V belt system and using a 6 rib serpentine style instead.

Extremely resistant to slippage and failure this design holds up much better the abuse of track duty and won't leave you stranded and waiting for tow back to the pit. Additionally, this kit does not accommodate and a/c compressor and the alternator and waterpump are underdriven by way of slightly larger pulleys. Combined, this puts less of a load on the crankshaft which leads to more efficient power delivery to the ground. If you track you E30 M3, this is an essential upgrade and until now was extremely difficult to source. Do not skip this pivotal step in your engine build or overhaul and get a leg up on the competition the Group A way.
Please note this kit is special order and in non-returnable

Features:

Kit replaces all engine pulleys and crank damper
Includes 6 rib serpentine belt
Underdriven waterpump and alternator pulleys
Recommended for off road and racing use only

This kit fits the following BMWs:
1986-1992 BMW M3 All

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BMW Drive Belts & V-Belts

Sub-Categories

E9X M3 Performance Underdrive Pulley Kit

Dinan Replacement Underdrive Pulley Belt For D560-0001 - Power Steeri...

ARP Harmonic Damper Bolt Set - BMW S58

Dinan Replacement Underdrive Pulley Belt For D560-0001 - Alternator/W...

E9X M3 6/2008+ Dinan Underdrive Pulley Kit

Dinan Underdrive Crankshaft Pulley Kit - E60 M5, E63/64 M6 S85 5.0L ...

BMW E9X M3 Replacement Belt For Underdrive Pulley Kit - (D560-0004) ...

Replacement Belt For Underdrive Pulley Kit D560-0003 & D560-0004 ...

Water Pump/Alternator Accessory Belt Service Kit w/ Kevlar Reinforced...

M7 Lightweight Crank Pulley - Stock Size

M7 Lightweight Crank Pulley - 4% Overdrive - R52 / R53

M7 Speed 4% Oversize Crankshaft Pulley for MINI Cooper

Unlocking Performance

Performance Boost:

Lightweight Advantage:

Advanced Design

Materials:

Precision Machining:

Optimal Fit:

Reliable Performance

Interference Fit:

Features at a Glance:

Unleash Your MINI's Potential

MINI R52 R53 M7 Gen 1 Power Up Kit - Supercharger Overdrive Pulley Ki...

Hex Bolt - N52, N54

Replacement Belt For Underdrive Pulley Kit D560-0003

High Performance Engine Power Kit For Gen 1 MINI S

No Longer Available.

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