OEM Accessory Belt Service Kit - F3X F22/23 N55 3.0L

T#:587391

Part#: 11287628661ABKT

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$ 171.99

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06-09-2026

$ 153.99 USD

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This kit includes the basic components recommended to replace when it comes time to swap out your accessory belt.

E9X M3 Performance Underdrive Pulley Kit

T#:593749

Part#: 10.00.011

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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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Accessory Belt Service Kit w/ Kevlar Reinforced Belt - BMW N55 F-Chas...

T#:22097553

Part#: 11287628661TKT

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06-16-2026

$ 101.98 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 Drive Belt, tensioner assembly, and 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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OEM Accessory Belt Service Kit - N54 3.0L

T#:554448

Part#: N54ACCKT

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04-15-2026

$ 169.24 USD

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Over time, accessory belts begin to wear out and crack. This can lead to the belt slipping, squeaking, or even snapping. Replace your belts and tensioners on a regular basis to ensure you don't end up stranded on the side of the road with a dead battery or overheated engine due to a bit of simple overlooked maintenance. This kit includes all of the items that will need replaced such as the belts, tensioners, and hardware.

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OEM Accessory Belt Service Kit - F3X F10 N20 2.0L

T#:587390

Part#: 11287594969ABKT

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06-29-2026

$ 62.94 USD

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This kit includes the basic components recommended to replace when it comes time to swap out your accessory belt.

OEM Accessory Belt Service Kit - E82/88 E9X N55

T#:567679

Part#: 11287582946KT4

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03-19-2026

$ 205.16 USD

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Over time, accessory belts begin to wear out and crack. This can lead to the belt slipping, squeaking, or even snapping. Replace your belts and tensioners on a regular basis to ensure you don't end up stranded on the side of the road with a dead battery or overheated engine due to a bit of simple overlooked maintenance. This kit includes all of the items that will need to be replaced such as the belts, tensioners, and hardware.

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Accessory Belt Service Kit w/ Kevlar Reinforced Belt - BMW E82/88 E9X...

T#:22163422

Part#: 11287568247TKT

Ships on Nov 12, 2026

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$ 178.94 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 Drive Belt, tensioner assembly, and idler pulleys. 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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OEM Accessory Belt Service Kit - N52 3.0L

T#:593693

Part#: N52ABKT

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This product was last offered at the strikethrough price on
07-08-2026

$ 105.43 USD

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Over time, accessory belts begin to wear out and crack. This can lead to the belt slipping, squeaking, or even snapping. Replace your belts and tensioners on a regular basis to ensure you don't end up stranded on the side of the road with a dead battery or overheated engine due to a bit of simple overlooked maintenance. This kit includes all of the items that will need replaced such as the belts, tensioners, and hardware.

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Hydraulic Alternator Belt Tensioner Assembly

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T#:396757

Part#: 11287838797

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$ 53.99 USD

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Lower Idler Pulley

T#:32350850

Part#: 11287557851

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$ 23.79 USD

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Accessory Belt Tensioner Assembly

T#:32350851

Part#: 11288604266

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$ 48.59 USD

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Friction Wheel N12 N14 N16 N18 1.6L Engine

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T#:591689

Part#: 11287598833

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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

T#:50066851

Part#: 11288088632

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$ 60.99

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08-13-2026

$ 60.97 USD

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Replaces broken or damaged drive belt tensioner.

Accessory Belt Service Kit w/ Kevlar Reinforced Belt - BMW N52 ...

T#:22130432

Part#: 11287530314TKT

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$ 104.71 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 Drive Belt, tensioner assembly, and 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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Mechanical A/C Belt Tensioner Assembly

T#:26305100

Part#: 11281433571

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05-03-2026

$ 47.32 USD

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Upper Idler Pulley

T#:26305073

Part#: 11287556251

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07-14-2026

$ 23.99 USD

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Accessory Belt Tensioner - Mechanical

T#:32450133

Part#: 11288570439

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$ 75.06 USD

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Accessory Belt Tensioner Assembly

T#:29101657

Part#: 11287563927

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$ 57.79 USD

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URO Crankshaft Vibration Damper - 11237573655

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T#:28171559

Part#: 11237573655

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$ 341.99 USD

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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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N54 AC Delete Accessory Belt Kit - BMW N54 3.0L

T#:26771665

Part#: 7PK1660KT

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$ 66.28 USD

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This AC Delete Accessory Belt Kit includes a new idler pulley and a shorter ECS Kevlar belt for deleting your AC compressor. ECS Tuning Performance Kevlar reinforced belts give you that extra piece of mind! 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. Tensile strength Elongation Hardness Temperature and oil resistance per standard JASO E 109-94 Flex testing per SAE J2432

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Deflection Pulley

T#:32450136

Part#: 11288673720

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05-03-2026

$ 25.19 USD

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Accessory Belt Service Kit w/ Kevlar Reinforced Belt - F3X F10 N20 2....

T#:22097555

Part#: 11287618848TKT

In Stock

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This product was last offered at the strikethrough price on
06-01-2026

$ 70.48 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 Drive Belt and an OEM tensioner assembly. 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 tensioner and upgrading your accessory belt 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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OEM Accessory Belt Service Kit - E30 M20

T#:554430

Part#: 64521706826KT1

In Stock

$ 201.62

This product was last offered at the strikethrough price on
05-26-2026

$ 194.08 USD

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Over time, accessory belts begin to wear out and crack. This can lead to the belt slipping, squeaking, or even snapping. Replace your belts and tensioners on a regular basis to ensure you don't end up stranded on the side of the road with a dead battery or over heated engine due to a bit of simple overlooked maintenance. This kit includes all of the items that will need replaced such as the belts, tensioners, and hardware.

Fits the following BMWs:
1984-1991 E30 BWM 325, 325i/is/ix, 325e/es

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Deflection Pulley

T#:34080699

Part#: 11287578674

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05-03-2026

$ 22.84 USD

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URO Aluminum Water Pump Pulley - E39, E46, E53, E60, E83, Z3, Z4 ...

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T#:340641

Part#: 11511436590

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$ 45.99 USD

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An upgrade over commonly failing plastic pulley

Crankshaft Pulley

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T#:591616

Part#: 11281735358

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$ 98.99 USD

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Reduces vibrations and connects accessories

Accessory Belt Tensioner Assembly

T#:32350878

Part#: 11287594969

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06-18-2026

$ 40.79 USD

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Accessory Belt Service Kit - E39 E46 M54 (2002+)

T#:401685

Part#: 11287512762KT3

In Stock

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This product was last offered at the strikethrough price on
06-23-2026

$ 222.24 USD

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This product was last offered at the strikethrough price on
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$ 222.24 USD

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This kit covers many of the common wear items that should be changed any time the serpentine belt is being replaced. As these cars gain years and mileage the belt tensioners will also need to be replaced along with the actual belts. It won't do any good to replace the belt if the tensioners are worn. This kit will save you time and money over buying these pieces individually. This kit includes an updated hydraulic alternator tensioner for added reliability and longevity.

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Mechanical A/C Belt Tensioner Assembly

T#:32350880

Part#: 11287512758

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05-03-2026

$ 40.79 USD

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Idler Pulley

T#:34080698

Part#: 11287578675

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05-03-2026

$ 22.02 USD

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$ 27.99

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Belt Tensioner

T#:32450132

Part#: 11287549873

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05-03-2026

$ 68.54 USD

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Bremmen Belt Tensioner Assembly -- E60 E61 E70 E82 E88 E9X Z4 ...

T#:39497969

Part#: 11287530314

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$ 43.24 USD

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This tensioner keeps the belt for the alternator, power steering, and air conditioning taut to provide maximum performance of each system.

A/C Belt Tensioner - 11281717210

T#:36913367

Part#: 11281717210

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05-03-2026

$ 53.03 USD

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Also known as a shock damper, the accessory belt tensioner is used to tension the air conditioning compressor belt. This ensures proper contact with the belt drive pulleys and prevents premature wear from improper tension.

If your belt is wearing prematurely or has excess slack, your belt tensioner may be to blame. Replace it with this high-quality Bremmen Parts tensioner to ensure proper tension and air conditioning functionality.

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URO Hydraulic Belt Tensioner - BMW E9X M3, E60 M5, E63 M6

T#:48573724

Part#: 11287835417

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$ 120.11 USD

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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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Power Steering Pump Pulley

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T#:592383

Part#: 32421722555

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$ 90.99 USD

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Driven by serpentine accessory belt

OEM Accessory Belt Service Kit - F10 F12 F13 F15 F16 F01 F02 ...

T#:554454

Part#: N55BMWKT

Ships in 2 Business Days

Sale - Save 8% $ 200.99

This product was last offered at the strikethrough price on
06-09-2026

$ 185.68 USD

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Over time, accessory belts begin to wear out and crack. This can lead to the belt slipping, squeaking, or even snapping. Replace your belts and tensioners on a regular basis to ensure you don't end up stranded on the side of the road with a dead battery or over heated engine due to a bit of simple overlooked maintenance. This kit includes all of the items that will need replaced such as the belts, tensioners, and hardware.

For vehicles with dynamic or adaptive drive

Fits the following BMWs:
F01/02 BMW 740i/Li/Li xDrive
F10 BMW 535i/i xDrive
F12/3 BMW 640i/i xDrive
F15 BMW X5 s/xDrive35i
F16 BMW X6 s/xDrive35i

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Accessory Belt Service Kit w/ Kevlar Reinforced Belt - F8X S55 ...

T#:22163426

Part#: 11287848605TKT

In Stock

$ 414.99

This product was last offered at the strikethrough price on
08-07-2026

$ 380.99 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 ECS Kevlar Reinforced Drive Belts, tensioner assembly, and idler pulleys. 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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Idler Pulley

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T#:26271781

Part#: 11288673720

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$ 29.99 USD

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Performance Accessory Belt Kit - Kevlar Reinforced - BMW B46TU/B48TU...

T#:29798952

Part#: 11288650740T1KT

Ships on Nov 12, 2026

Sale - Save 24% $ 137.99

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

$ 105.35 USD

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Having your accessory belt fail is a major inconvenience and can leave you on the side of the road if the alternator isn't charging and the mechanical water pump isn't turning. Over time the tensioner and the belt itself wears out and will eventually fail. This kit includes everything you need to service the belt drive system and keep everything in check. Included: ECS Tuning Kevlar Reinforced Performance Accessory Belt - Designed to resist OEM Febi Belt Tensioner Genuine BMW Tensioner Hardware

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Accessory Belt Service Kit w/ Kevlar Reinforced Belt - F22/23 F3X B58...

T#:22097533

Part#: 11288613707TKT

Ships on Nov 12, 2026

Sale - Save 24% $ 137.99

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

$ 105.35 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 Drive Belt, tensioner assembly, and the hardware required to install the new tensioner. 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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Drive Wheel For Water Pump

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T#:5760271

Part#: 11517619020

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$ 42.01 USD

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Accessory Belt Service Kit w/ Kevlar Reinforced Belt - BMW E82/88 E9X...

T#:22163417

Part#: 11287582946TKT

Ships on Nov 12, 2026

$ 221.92 USD

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$ 221.92 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 Drive Belt, belt tensioner, and idler pullies. 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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Accessory Belt Tensioner Assembly

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T#:591622

Part#: 11287563927

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$ 60.99 USD

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This is the main belt tensioner for A/C, Alternator, and power steering.

Mechanical Belt Tensioner - NTN/NSK Bearings

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T#:591687

Part#: 11287571015

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Crankshaft Pulley With Vibration Damper

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:593668

Part#: 11237564969

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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

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T#:638798

Part#: 11517840403

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S54 Turner Motorsport Ultimate Power Pulley And Drive Belt Overhaul S...

T#:15710772

Part#: 11281730349-KT

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Sale - Save 1% $ 499.99

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

$ 494.69 USD

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05-03-2026

$ 494.69 USD

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The idea of power pulleys is simple. The less effort the engine puts into running accessories such as the water pump, power steering, pump alternator etc., the more of that power can be used elsewhere - your wheels! The way this is done by reducing the rotation of the pulleys by as much as 10-20%! The end result is more horsepower at your disposal. Turner has done extensive testing (on and off the track), to ensure that the accessory systems still function as intended and without failure. These pulleys offer an excellent compromise of power gains, reliability and performance. All Turner pulleys are constructed of high quality T-6061 aluminum for durability and longevity. They are also finished in a black hard anodizing, which is highly resistant to wear including chemical and heat exposure. They have been designed to carry stock-like aesthetics, but with increased strength properties and lighter weight. Because of the durable aluminum construction, you can also put the worries of a serious plastic failure to rest. These pulleys will last, all the while increasing horsepower too! While you're installing your Power Pulley Kit, it makes sense to overhaul your Accessory Belt System as well, so this kit includes our Accessory Belt Kit as well.

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OEM Accessory Belt Service Kit - E9X M3 S65

T#:391554

Part#: 11287837898

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Starting at $ 964.99 USD

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Starting at $ 964.99 USD

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This comprehensive kit includes both belts, belt tensioners, upper and lower deflection pulleys, and the adjusting pulley. Select from all Genuine BMW parts or a combination of OEM/OE BMW parts. Staying on top of your belt maintenance is the smart move. Cracked or worn belts are a recipe for a headache or worse. The main drive belt runs critical components - the alternator, water pump, and power steering pump. The pulleys contain bearings that may be worn when it comes time to replace the belts. You can check the pulleys by relieving tension on the belt and feeling each pulley for play or grinding. The tensioner also sees similar wear. If your pulleys are new or don't need replacement, you can pick up the belts on their own.

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OEM Accessory Belt Service Kit - B46/48 B58

T#:587399

Part#: 112886137071ABKT

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

$ 98.77 USD

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Over time, accessory belts begin to wear out and crack. This can lead to the belt slipping, squeaking, or even snapping. Replace your belts and tensioners on a regular basis to ensure you don't end up stranded on the side of the road with a dead battery or overheated engine due to a bit of simple overlooked maintenance. This kit includes all of the items that will need to be replaced such as the belts, tensioners, and hardware.

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N54 "Bulletproof" Crank Hub & Serpentine Kit - BMW E82/88 E9X N54 3.0...

T#:1241396

Part#: TMSN54BPKT

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

$ 512.27 USD

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$ 512.27 USD

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BMW has a seemingly endless number of fans of the N54/N55/S55 engines, three straight-six turbo engines that are each capable of 750+ horsepower, but that doesn't mean they were without their faults! BMW's N54 had a notoriously rocky start with reliability due to multiple issues such as fuel injectors failing, turbos failing, serpentine belt failure, crank hubs coming loose, and more... BMW made multiple attempts to fix the issues plaguing the N54, but they could only do so much and the fixes rolled out seemed temporary at best. Following the N54, BMW released their updated N55 and S55 engines, giving many people hope that these engines would address the previous issues. Unfortunately, this was only some-what the case. Crank hubs and crank bolts continued to loosen over time and serpentine belts continued to shred themselves and get pulled into the oil pan through the front main seal. For all three engines, this meant a single failure could effectively turn your engine into an oversized paperweight. Luckily for us, the BMW community is full of skilled enthusiasts who have gladly taken up the task to offer solutions! The first headache to be addressed was the Crank Hub and Bolt. Using a simple plate that fits perfectly over your crank hub's hex-head bolt and mounts up against the damper, the crank bolt is effectively locked in place, preventing it from being able to back out until the plate is fully removed. Next up was the serpentine belt failures. It's not known what exactly causes the serpentine belt to split, but once it does, the pieces hanging off of the belt wrap around and behind the damper. This leads to the belt breaking up into smaller pieces and eventually getting pushed between the crank hub and rear main seal into the oil pan. These small pieces of debris get caught in and block the oil pickup, preventing oil flow and leading to engine failure. To prevent this, multiple aftermarket companies came up with their own versions of Crank Seal Plates. This plate is installed behind the front damper, blocking the opening that allows the serpentine belt to pass between the crank hub and seal, keeping debris out of your oil pan! Also included in this kit are the components to service your front Oil Cooler/Filter Housing gaskets, refresh your drive belt system, and install the aftermarket upgrades. Kit Features and Contents: Vargas Turbo Crank Bolt Capture Vargas Turbo Crank Seal Plate OEM Accessory Belt OEM Belt Tensioner & Idler Pullies Liqui-Moly Longtime High Tech Engine Oil (5w-30) - 7 Liters OEM Hengst Oil Filter OEM Oil Filter/Cooler Housing Gaskets TMS Oil Change Sticker Genuine BMW Full-Strength Coolant - 1 Liter Looking to go even further and upgrade your Crank Hub as well? Check out T#558924

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