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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

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$ 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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Vargas "Spline Lock" Crank Hub Solution - Includes Crank Bolt Capture...

T#:558795

Part#: VTT-CRANKHUB-1

In Stock

$ 889.99 USD

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$ 889.99 USD

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Under certain conditions, the N55 crank hub likes to spin, without warning and even when the engine is in perfect health. The engineers at Vargas saw and dealt with this problem time and again, and they saw fit to do something about it. This hub uses a proprietary "Spline Lock" technology that uses high tolerance machined splines which press into the crank, and positively lock the hub to the crank. The splines are machined in such a way that rotational forces drive the hub, and splines deeper into the crank meaning when the hub encounters a situation that would normally slip a stock hub the splined hub is driven into the crank to keep it in place (much like a splined extractor). Features: Installs the same as a stock hub Does NOT require the crank to be drilled for pins Manufactured from Harndered 17-4SS We suggest the Crank Hub System ONLY be installed by a qualified shop or technician. Timing tools are 100% REQUIRED if installed improperly engine damage may occur. DISCLAIMER: VTT and ECS are not responsible for any engine damage caused by improper installation, or misuse of the crank hub solution.

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Vargas N54/55 Billet Crank Seal Guard - BMW N54 N55 3.0L

T#:638889

Part#: VTT-CRANKGUARD

In Stock

Starting at $ 89.99 USD

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Starting at $ 89.99 USD

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It is a well-known issue on the BMW N54/55 platforms that your serpentine belt can fail for various reasons. When this happens, there is a high chance of the belt getting sucked behind the front damper pulley and then being pushed past the crank seal into your oil pan. From there it can get sucked into the oil pick up causing total engine failure. Even if you do not lose the engine, it is a COSTLY repair to remove the sub-frame and drop the oil pan to remove the belt. The best way to combat this is to watch for oil leaks and keep up on your maintenance. BUT, even with those preventative measures, pre-mature belt failure can occur. This crank seal guard installs over your front crank seal and will keep the belt from being sucked in if a belt failure does occur. This is a cheap way to ensure you do not end up having to replace your motor from oil starvation due to an ingested belt. Vargas' seal is different from those already on market in two major ways. Firstly, it is not offensively priced. Secondly, it is 100% billet with no welds on the tabs to break, no cheap bent thin steel pieces. 100% Billet 6061-T6 aluminum, anodized black for long-term corrosion resistance. Crank Seal Guard includes: One VTT Billet N54/55 Crank Seal Guard Two extended 12.9 Grade bolts, and two stainless washers We highly recommend you install WITH a crank bolt capture at the same time, as you have to remove the damper anyway. Then you will get the benefit of helping eliminate the dreaded spun crank hub and the crank seal issue

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VTT Billet Power Steering Pulley - N54

T#:7292042

Part#: VTT-N54-PSN54

Ships in 2 Business Days

Starting at $ 56.99 USD

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Starting at $ 56.99 USD

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Vargas has introduced their new Billet Power Steering pulleys for the N54 engine! A well-known issue with the N54 with Hydraulic power steering is the plastic pulley either hitting the subframe, or breaking on its own. This can result in the belt to be ejected from the pulley, and leave you stranded with no serpentine belt. This also increases the chance of sucking the belt into the engine through the front seal. Put an end to the dreaded plastic PS pulley issues with the VTT 100% Billet Aluminum PS pulley. These are constructed from 6061-T6 aluminum and anodize in one of 4 colors (Black, Red, Blue, and Clear) for a great look, and long-lasting finish. These weigh 11oz, very close to the weight of a stock pulley, and are lighter than the cast aluminum versions on the market.

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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.

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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$ 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.

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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Sale - Save 10%

$ 95.99

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

$ 86.30 USD

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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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$ 126.99

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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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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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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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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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.

Hex Bolt - MINI

T#:16940487

Part#: 11217616164

In Stock

Sale - Save 23% $ 12.99

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

$ 9.99 USD

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Sale - Save 23%

$ 12.99

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

$ 9.99 USD

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Used to attach the crank pulley / vibration dampener

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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Qty

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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No Longer Available.

T#:396369

Part#: 12311311449KT

Ships on Sep 17, 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

Vargas "Spline Lock" Crank Hub Solution - Includes Crank Bolt Capture...

Vargas N54/55 Billet Crank Seal Guard - BMW N54 N55 3.0L

VTT Billet Power Steering Pulley - N54

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

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

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

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

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

E9X M3 6/2008+ Dinan Underdrive Pulley Kit

Hex Bolt - N52, N54

Hex Bolt - MINI

Replacement Belt For Underdrive Pulley Kit D560-0003

No Longer Available.

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