Home
Engine Parts
Drive Belts, Pulleys, Tensioners

BMW Drive Belts & V-Belts for BMW Z Series E85/6 (2003-2008)

Clear BMW chassis

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.

Sub-Categories

Sort By:

Turner Motorsport Power Pulley Upgrade Kit - Z4 M Roadster & Coupe ...

T#:3465

Part#: PPK-MZ4

In Stock

Sale - Save 25% $ 354.99

This product was last offered at the strikethrough price on
06-13-2026

$ 266.24 USD

Add to Wish List

Qty

Sale - Save 25%

$ 354.99

This product was last offered at the strikethrough price on
06-13-2026

$ 266.24 USD

Add to Wish List

Underdrive Power Pulleys work to 'free up' horsepower. Any accessory that spins from the main drive belt is using up power. That's power that could otherwise be used to move the car. By giving some of that power back to the engine, you can make the car faster! It's like FREE HORSEPOWER !

Underdrive pulleys for your BMW will slow down engine-mounted accessories - the water pump, power steering pump, and alternator*. These systems contribute to 'parasitic losses' - power lost from what the engine could produce if it did not have these systems. Since less energy is used to move them, that power is transferred back to the engine and used to propel the car. Our pulleys give a 10-20% reduction in rotation, releasing up to 11hp on most BMW six-cylinder engines. There's also a small but noticeable improvement in throttle response too! We have done extensive testing and development work, both on and off the track, to ensure that the accessory systems function as they should. On our Racing pulley kits we actually underdrive certain components more so we feel our Street pulleys are an ideal compromise between power/torque gains, reliability, and system performance. Our pulley kits have been on the market for over ten years, and used in all of our own cars, with zero component failures related to their use.

Our pulleys are made from T-6061 aluminum and finished in a durable black hard anodize that is very resistant to wear, chemical exposure, and heat. We designed our pulleys to look similar to the factory parts but also to be stronger and, in most cases, slightly lighter too. For example, With our hardcoat aluminum you will never have to worry about a serious failure of a stock plastic pulley. A 'stealth' approach to aesthetics was our goal and we let the results speak for the pulley design. Installation is straight forward and easy with simple hand tools. Removal of the fan is required for access to the front of the engine. Total install time for a 3-piece pulley set should be around 1.5 hours. A new longer belt is included and we also recommend replacing the separate A/C belt, belt tensioners, and the guide and deflection pulleys at the same time.

Additional Info

Clickhere for example dyno graph

Click here for installation instructions.

Turner Pulley Kit contents:

Turner water pump pulley

Turner power steering pump pulley

new extended length belt

instructions

This underdrive pulley kit fits the following BMW:
2006-2008 MZ4 Z4 M Coupe / Z4 M Roadster

Show More Show Less

Genuine BMW Hydraulic Alternator Belt Tensioner Assembly

T#:360630

Part#: 11287838797

Ships in 4 Business Days

6% off MSRP $ 304.99

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

$ 286.99 USD

Add to Wish List

Qty

6% off MSRP

$ 304.99

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

$ 286.99 USD

Add to Wish List

Genuine BMW Water Pump Pulley

T#:4472

Part#: 11511436590

In Stock

Sale - Save 6% $ 73.99

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

$ 69.65 USD

Add to Wish List

Qty

Sale - Save 6%

$ 73.99

This product was last offered at the strikethrough price on
06-25-2026

$ 69.65 USD

Add to Wish List

SEE T#337981

Genuine BMW Power Steering Pulley - S54

T#:19787

Part#: 32427830838

In Stock at Vendor

$ 167.99

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

$ 136.99 USD

Add to Wish List

Qty

$ 136.99 USD

Add to Wish List

Genuine BMW Pulley
This item fits the following BMW Chassis:
E46 M3,E85 Z4M,E46,E85 Z4,E86 Z4

Genuine BMW Mechanical A/C Belt Tensioner Assembly

T#:360602

Part#: 11281433571

Ships in 3 Business Days

3% off MSRP $ 229.99

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

$ 221.99 USD

Add to Wish List

Qty

3% off MSRP

$ 229.99

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

$ 221.99 USD

Add to Wish List

Genuine BMW Water Pump Pulley - S54 3.2L

T#:19288

Part#: 11517840403

Ships in 4 Business Days

$ 208.99 USD

Add to Wish List

Qty

$ 208.99 USD

Add to Wish List

Genuine BMW Pulley
This item fits the following BMW Chassis:
E46 M3,E85 Z4M,E46,E85 Z4,E86 Z4

Fits BMW Engines including:
S54

Genuine BMW Alternator Pulley

T#:38953

Part#: 12317501754

Ships in 4 Business Days

3% off MSRP $ 122.99

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

$ 118.99 USD

Add to Wish List

Qty

3% off MSRP

$ 122.99

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

$ 118.99 USD

Add to Wish List

Genuine BMW Pulley Alternator - D=55Mm
This item fits the following BMW Chassis:
E39,E46,E53 X5,E83 X3,E85

Fits BMW Engines including:
M54

Genuine BMW Mechanical A/C Belt Tensioner Assembly

T#:360614

Part#: 11287512758

Ships in 4 Business Days

3% off MSRP $ 229.99

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

$ 221.99 USD

Add to Wish List

Qty

3% off MSRP

$ 229.99

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

$ 221.99 USD

Add to Wish List

Genuine BMW Belt tensioner pitman arm

T#:33617

Part#: 11281726773

Ships in 4 Business Days

2% off MSRP $ 60.99

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

$ 59.99 USD

Add to Wish List

Qty

2% off MSRP

$ 60.99

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

$ 59.99 USD

Add to Wish List

Genuine BMW Pitman Arm
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E34,E36,E39,E46,E53 X5 X5,E83 X3,E85 Z4,E86 Z4

Fits BMW Engines including:
M50,M52,M54,M56,S50,S52,S54

Show More Show Less

Genuine BMW Crankshaft Pulley With Vibration Damper

T#:32895

Part#: 11237564969

Ships in 4 Business Days

8% off MSRP $ 789.99

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

$ 723.99 USD

Add to Wish List

Qty

8% off MSRP

$ 789.99

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

$ 723.99 USD

Add to Wish List

Genuine BMW Vibration Damper -
This item fits the following BMW Chassis:
E70 X5,E82,E83 X3,E85,E86,E89 Z4,E90,E92,E93

Fits BMW Engines including:
N51,N52,N52N

Show More Show Less

Genuine BMW Hydraulic Alternator Belt Tensioner

T#:360606

Part#: 11281717188

Ships in 4 Business Days

6% off MSRP $ 165.99

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

$ 155.99 USD

Add to Wish List

Qty

6% off MSRP

$ 165.99

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

$ 155.99 USD

Add to Wish List

Genuine BMW Belt tensioner base plate

T#:14460

Part#: 11281726774

Ships in 6 Business Days

$ 67.99 USD

Add to Wish List

Qty

$ 67.99 USD

Add to Wish List

Genuine BMW Base Plate
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E34,E36,E39,E46,E53 X5 X5,E83 X3,E85 Z4,E86 Z4

Fits BMW Engines including:
M50,M52,M54,M56,S50,S52,S54

Show More Show Less

Select Vehicle

Purpose

Category

Drive Belts, Pulleys, Tensioners

Brand

Price

Special Offers

On Sale (2)

Shipping