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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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Vargas N54/55 Billet Crank Seal Guard - BMW N54 N55 3.0L
2X Entries Into Our F80 M3 Sweepstakes
Vargas Turbo Technologies - Corporate Logo
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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Macht Schnell - Corporate Logo
T#:593749
Part#: 10.00.011
Ships in 4 Business Days
$ 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 Turbo Technologies - Corporate Logo
T#:558795
Part#: VTT-CRANKHUB-1
Ships in 1-2 days
$ 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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VAC Motorsports - Corporate Logo
T#:8076765
Part#: VAC-HPCD-M50-ACP
Ships in 3 Business Days
$ 149.99 USD
Free Shipping on orders $49 and up
If you are planning on keeping your Air Conditioning system in your street or track car, then you will need to combine VAC's ATI AC Pulley with the ATI Harmonic Damper.

Hydraulic Alternator Belt Tensioner Assembly
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:396757
Part#: 11287838797
In Stock
$ 53.99 USD
Free Shipping on orders $49 and up
Friction Wheel N12 N14 N16 N18 1.6L Engine
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:591689
Part#: 11287598833
In Stock
$ 84.99 USD
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$ 84.99 USD
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Friction Wheel for MINI N12 N14 N16 N18 1.6L Engine - URO

Upgrade your MINI's engine with the Friction Wheel for N12 N14 N16 N18 1.6L engine from URO. This friction wheel serves as a vital link between two pulleys, driving the water pump for optimal engine performance. Over time, the bearings in this unit may begin to squeak and fail, making it essential to replace when changing the serpentine belt.

Benefits:

  • Ensures smooth operation of the water pump
  • Prevents squeaking bearings for quieter engine performance
  • Designed for compatibility with N12 N14 N16 N18 1.6L engines
  • Easy replacement during serpentine belt changes
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URO Drive Belt Tensioner W/ Pulley - BMW F8X M2 M3 M4
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URO - Corporate Logo
T#:50066851
Part#: 11288088632
In Stock
$ 60.99 USD
Free Shipping on orders $49 and up
Replaces broken or damaged drive belt tensioner.
VTT Billet Power Steering Pulley - N54
2X Entries Into Our F80 M3 Sweepstakes
Vargas Turbo Technologies - Corporate Logo
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
Free Shipping on orders $49 and up
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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URO - Corporate Logo
T#:340641
Part#: 11511436590
In Stock
$ 45.99 USD
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$ 45.99 USD
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An upgrade over commonly failing plastic pulley

VAC Motorsports - Corporate Logo
T#:27905092
Part#: VAC-HPCD-M50
Ships in 7 Business Days
$ 799.99 USD
Free Shipping on orders $49 and up

If you're grappling with issues like crankshaft failures and oil pump breakdowns in your BMW 6-cylinder engines, you're not alone. Even seasoned mechanics can overlook the critical aspect of harmonic resonance control in these inline-6 motors, despite their optimal configuration.

Enter ATI Performance Products in collaboration with VAC Motorsports, presenting a solution in the form of new dampers tailored for BMW 2.5L, 2.8L, 3.0L, and 3.2L straight-6 engines found in various models like the E36 and E46 M3, E9X, and E6X, as well as newer Z3s and Z4s. These dampers effectively nullify crankshaft harmonic vibrations, paving the way for enhanced horsepower and torque output, alongside a reduction in internal engine wear. Say goodbye to issues like fractured oil pumps and timing chain mishaps! By pairing these dampers with a VAC accessory pulley, you seamlessly replace the OEM balancer. Featuring a 7” outer diameter and OEM-style timing alignment tabs, these ATI Super Dampers boast SFI 18.1 Safety Certification, ensuring they're competition-ready.

What sets the ATI SuperDamper apart? It's the remedy for vibration woes in inline 6 engines, especially those equipped with lightweight clutch and flywheel setups. Expect diminished wear on bearings, engine accessories, and oil pumps, all while being compatible with underdrive pulleys.

Included in the kit are the damper itself, a lightweight VAC Billet Crankshaft Pulley, along with all necessary mounting and installation hardware. Note that it's not compatible with S50B30 & S50B32 Euro Engines. For street/track vehicles with air conditioning, opting for the Additional A/C Pulley Option is imperative, given that the OE A/C pulley isn't compatible. Rest assured, all required mounting and installation hardware is included, and the entire package is proudly Made in the USA.

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URO Crankshaft Vibration Damper - 11237573655
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URO - Corporate Logo
T#:28171559
Part#: 11237573655
In Stock
$ 341.99 USD
Free Shipping on orders $49 and up
A vibration damper is crucial for preventing shock load factors that could damage the crankshaft. If your damper is faulty, opt for this quality replacement from URO Parts for a lasting and comprehensive fix.
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URO - Corporate Logo
T#:48573724
Part#: 11287835417
Ships in 1 Business Day
$ 120.11 USD
Free Shipping on orders $49 and up
Hydraulic Belt Tensioner for E9x M3 with S65 engine and E60 M5, E63 M6 with S85 engine. This oil-filled tensioner keeps the main drive belt in the proper tension. Over time, the seals wear, allowing fluid to leak out and the tensioner then becomes frozen or inoperable. Replacement is the best corrective action to take. This can be done during any belt or pulley service or anytime the fan is off the engine.
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Crankshaft Pulley
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URO - Corporate Logo
T#:591616
Part#: 11281735358
Ships in 1 Business Day
$ 98.99 USD
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$ 98.99 USD
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Reduces vibrations and connects accessories
Power Steering Pump Pulley
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:592383
Part#: 32421722555
In Stock
$ 90.99 USD
Free Shipping
$ 90.99 USD
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Driven by serpentine accessory belt
VAC Motorsports - Corporate Logo
T#:12610319
Part#: VAC-HPCD-S14
Ships in 6 Business Days
$ 699.99 USD
Free Shipping on orders $49 and up
NOTE: Due to space limitations, the design of this damper will overdrive your components (water pump, power steering, and alternator) by approximately 10-13%; we highly recommend using underdrive pulleys in your setup Controlling the harmonic resonance of the BMW S14 engine is highly important as RPMs rise, but the ideal configuration of the 4-cylinder motor makes even the most experienced engine builders overlook some fundamental principles of engine harmonics that can be destructive. Harmonics destroy these motors by causing extensive oil pump and crankshaft damage, but the addition of VAC’s Harmonic Damper eliminates the unstable crankshaft harmonic vibrations that cause internal engine wear. By eliminating harmonic vibrations, your S14 engine will be able to produce more horsepower and torque with increased reliability. The VAC/ATI Harmonic Damper is made with an integral pulley, eliminating the need for the additional pulley other models require. Exceeds SFI 18.1 Safety Certification Eliminates problems with lightweight clutch and flywheel assemblies Controls destructive harmonic forces Reduces instances of bearing wear, accessory failure and oil pump failure Includes lightweight VAC Billet Crankshaft Pulley Made in USA ATI Performance Products, Inc. is located in Baltimore, MD, and specializes in producing and maintaining high performance products for street and track applications. Over the years ATI has earned a reputation for its cutting edge technology, attention to detail and rigorous testing under race conditions.
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Drive Wheel For Water Pump
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URO - Corporate Logo
T#:5760271
Part#: 11517619020
In Stock
$ 42.01

This product was last offered at the strikethrough price on
09-08-2026

$ 41.99 USD
Free Shipping on orders $49 and up
$ 41.99 USD
Free Shipping on orders $49 and up

Mechanical Belt Tensioner - NTN/NSK Bearings
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:591687
Part#: 11287571015
In Stock
$ 53.99 USD
Free Shipping on orders $49 and up
Accessory Belt Tensioner Assembly
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:591622
Part#: 11287563927
In Stock
$ 60.99 USD
Free Shipping on orders $49 and up
This is the main belt tensioner for A/C, Alternator, and power steering.

Mechanical Alternator Belt Tensioner Assembly
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:371980
Part#: 11281427252
Ships in 1 Business Day
$ 50.99 USD
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$ 50.99 USD
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Tensions the belt connecting the water pump, alternator, and power steering pump. Includes roller.
Crankshaft Pulley With Vibration Damper
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URO - Corporate Logo
T#:593668
Part#: 11237564969
Ships in 1 Business Day
$ 234.99 USD
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$ 234.99 USD
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Every time the cylinders fire, torque is transferred into the crankshaft. The crankshaft deflects under this torque, which sets up vibrations when the torque is released. At certain engine speeds the torque imparted by the cylinders are in synch with the vibrations in the crankshaft, which results in a phenomenon called resonance This resonance causes stress beyond what the crankshaft can withstand, resulting in crankshaft failure. The accessory pulley acts as a balancer and prevents these vibrations from destroying your crankshaft.
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Water Pump Pulley
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:638798
Part#: 11517840403
Ships in 1 Business Day
$ 57.99 USD
Free Shipping on orders $49 and up

VAC Motorsports - Corporate Logo
T#:27705420
Part#: VACUPPSS542ULG
Ships on Oct 27, 2026
$ 294.99 USD
Free Shipping on orders $49 and up

Crafted from high-grade domestic USA 6061-T6 Billet Aluminum, these pulleys are a testament to precision engineering. Rigorously tested through extensive hours of racing and street use, they've proven their reliability and performance excellence.

Each pulley is meticulously zero-balanced and thoroughly inspected to ensure zero-runout, guaranteeing optimal performance without compromising on reliability, noise, or vibration.

This comprehensive kit comprises a precision power steering pulley, water pump pulley, and an OE Contitech Brand drive belt. Experience a notable boost of 8hp and 7 ft/lbs. of torque to the wheels, making it ideal for stock vehicles, track cars, and even those with upgraded audio systems seeking consistent voltage output from their alternators.

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Idler Pulley
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URO - Corporate Logo
T#:37892100
Part#: 11287578675
Ships in 1 Business Day
$ 28.54 USD
Free Shipping on orders $49 and up
The idler pulley serves as a guide and support for the serpentine belt, ensuring it runs smoothly over the entire system.
Idler Pulley
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:26271781
Part#: 11288673720
In Stock
$ 29.99 USD
Free Shipping on orders $49 and up


Belt Tensioner Conversion Kit
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URO - Corporate Logo
T#:600039
Part#: 11287838797K
Back Ordered
$ 82.99 USD
Free Shipping on orders $49 and up
Update from a mechanical tensioner to a hydraulic style tensioner
Crank Pulley With Dampener for MINI R5X R6X
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:591628
Part#: 11237562801
In Stock
$ 72.00

This product was last offered at the strikethrough price on
07-28-2026

$ 49.78 USD
Free Shipping on orders $49 and up
$ 49.78 USD
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Enhance your Mini's engine performance with this essential Engine Harmonic Balancer/Vibration Dampener. Designed to smooth out rotational vibrations from the crankshaft, this pulley-driven unit ensures optimal engine operation. When worn, it may produce unusual noises near the passenger's side oil pan, signaling the need for replacement. For comprehensive maintenance, it's advisable to change the hex bolts along with the unit. Benefit from:

  • Improved engine performance.
  • Reduction of rotational vibrations.
  • Prevention of unusual noises.
  • Compatibility with Mini vehicles.
  • Easy replacement process.
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URO Upper Idler Pulley - BMW N54 3.0L
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:591621
Part#: 11287556251
In Stock
$ 28.89

This product was last offered at the strikethrough price on
10-08-2026

$ 23.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
$ 28.89

This product was last offered at the strikethrough price on
10-08-2026

$ 23.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
The higher idler pulley

A/C Tensioner Pulley
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URO - Corporate Logo
T#:373241
Part#: 11282245087
In Stock
$ 26.99

This product was last offered at the strikethrough price on
09-29-2026

$ 22.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
$ 26.99

This product was last offered at the strikethrough price on
09-29-2026

$ 22.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
The A/C drive belt is tightened buy a separate belt tension.

Idler Pulley
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URO - Corporate Logo
T#:373226
Part#: 11281731220
Ships in 1 Business Day
$ 22.99 USD
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$ 22.99 USD
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Runs on water pump and alternator belt
Mechanical A/C Belt Tensioner Assembly
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URO - Corporate Logo
T#:361998
Part#: 11281433571
Ships in 1 Business Day
$ 53.99 USD
Free Shipping on orders $49 and up
$ 53.99 USD
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Complete tensioner assembly with roller

URO - Corporate Logo
T#:591618
Part#: 11287530314
Ships in 1 Business Day
$ 48.99 USD
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Complete tensioner assembly
Accessory Belt Tensioner Assembly
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URO - Corporate Logo
T#:583971
Part#: 11287582946
Ships in 1 Business Day
$ 46.99 USD
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A/C Tensioner Pulley
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URO - Corporate Logo
T#:384307
Part#: 11281742859
Ships in 1 Business Day
$ 43.99 USD
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$ 43.99 USD
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Keep your A/C belt tight and turning

Active Autowerke Power Pulley Kit - E9x M3
For vehicles with production date 2007-5/2008
Active Autowerke - Corporate Logo
T#:397285
Part#: 13-001
Ships in 3 Business Days
5% off MSRP $ 399.00

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

$ 379.99 USD
Free Shipping
5% off MSRP
$ 399.00

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

$ 379.99 USD
Free Shipping
Easy to install - reduces parasitic losses from belt driven auxiliary components. Engine crankshaft pulley remains the same, this modification simply unleashes untapped potential from your vehicle. Expect to see gains around 10 RWHP from your S65. All BMW power pulleys included, including alternator, water pump, and power steering pulleys.
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URO A/C Belt Tensioner Assembly With Pulley - E31, E38
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URO - Corporate Logo
T#:592822
Part#: 11281720039
Ships in 1 Business Day
$ 29.99 USD
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$ 29.99 USD
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Complete with pulley
Lower Idler Pulley
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URO - Corporate Logo
T#:384427
Part#: 11287557851
Ships in 1 Business Day
$ 23.99 USD
Free Shipping on orders $49 and up
The lowest of the idler pulleys on the accessory drive belt. Featuring NTN/NSK bearing.


URO - Corporate Logo
T#:37993420
Part#: 11281745545
In Stock
$ 36.99 USD
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$ 36.99 USD
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URO A/C Belt Tensioner Pulley W/ Lever - E60, E63, E64
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URO - Corporate Logo
T#:591647
Part#: 11287839135
Ships in 1 Business Day
$ 164.99 USD
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$ 164.99 USD
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Includes belt tensioner pulley & lever
VAC Motorsports - Corporate Logo
T#:928436
Part#: VAC-UPPS-M62-99
Ships in 8 Business Days
$ 329.99 USD
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$ 329.99 USD
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VAC Underdrive Power Pulley Sets for the M60 release 8.5 horsepower @ 5800 RPM and 8 lb/ft of torque @ 4500 RPM (measured @ the wheels.) Always made using only virgin billet 6061 T6 aluminum, an anodized finish, and the tightest tolerances; VAC's pulleys are used on some of the fastest BMWs on the planet. A lightweight design optimizes performance and response while under-driving components just the right amount for proper function at all RPMs.
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VAC Motorsports - Corporate Logo
T#:29533361
Part#: VACUPPSS543ULG
Ships on Oct 27, 2026
$ 349.99 USD
Free Shipping on orders $49 and up
These pulleys are precision made from domestic USA 6061-T6 Billet Aluminum. They have undergone thousands of hours in testing, race use, and street miles accumulated to show these pulleys work great and give you the edge. Each is precision zero-balanced and inspected for zero-runout for the best performance and to have no adverse effects on reliability, noise, or vibration. This 3 Pulley Race Set is a very popular choice: just like the 2 pulley set, a precision power steering pulley and water pump pulley are included, but VAC includes an additional underdriven alternator pulley for maximum power output on the track. We have seen 11hp and 9 ftlbs to the wheels on otherwise stock racing cars with this kit.
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VAC Motorsports - Corporate Logo
T#:598754
Part#: VAC-UPPS-S14-3-G
Ships on Oct 27, 2026
$ 334.99 USD
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$ 334.99 USD
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Made using only virgin billet aluminum, a hard anodized finish, and the tightest tolerances, VAC's pulley sets are used on some of the fastest S14s on the planet. This lightweight design optimizes performance and response while under-driving components just the right amount for proper function. Perfect for track cars, they can also be used on a street car without any problems. Features: Reduces pump cavitation at higher rpm's Saves weight when every bit counts Includes new, correct length, labeled Contitech belts for WP, ALT, P/S
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Drive Belt Pulley Cap
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URO - Corporate Logo
T#:639224
Part#: 11281727159
In Stock
$ 3.99 USD
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Replace that missing protective cap and protect your belt tensioner bearing from debris.

Mechanical A/C Belt Tensioner Assembly
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URO - Corporate Logo
T#:384308
Part#: 11287512758
In Stock
$ 43.99 USD
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Complete tensioner assembly with roller
Deflection Pulley
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URO - Corporate Logo
T#:591619
Part#: 11287535860
Back Ordered
$ 17.99 USD
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Commonly replaced when servicing belts or cooling system, or when it begins to make noise.

Hydraulic Belt Tensioner Damper Only
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URO - Corporate Logo
T#:584487
Part#: 11288620210
In Stock
$ 40.99 USD
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$ 40.99 USD
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URO A/C Idler Pulley - BMW E82/88 E84 E9X N55 3.0L
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:43446142
Part#: 11287578674
Ships in 1 Business Day
$ 25.99 USD
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Commonly replaced when servicing belts or the cooling system, or when it begins to make noise.
Hydraulic Alternator Belt Tensioner Roller
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URO - Corporate Logo
T#:362028
Part#: 11281748131
In Stock
$ 13.99 USD
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Replacement is recommend with every belt service
URO Accessory Belt Tensioner w/ Pulley for G05, E70, F01
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URO - Corporate Logo
T#:37993415
Part#: 11287549873
Ships in 1 Business Day
$ 133.99 USD
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Reduces strain on engine components by maintaining proper tension, helping to avoid costly repairs.


Accessory Belt Idler Pully
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URO - Corporate Logo
T#:15445582
Part#: 11287549557
Back Ordered
$ 19.99 USD
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Commonly replaced when servicing belts or cooling systems, or when it begins to make noise.
Deflection Pulley
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URO - Corporate Logo
T#:592842
Part#: 11287542887
Ships in 1 Business Day
$ 46.99 USD
Free Shipping on orders $49 and up
Commonly replaced when servicing belts or cooling system, or when it begins to make noise.