Performance Clutch Kits

E36, E46 JB Racing Ultra-Light Racing Clutch/Flywheel Assembly ...

T#:340509

Part#: WCCLUTCH

Ships in 5 Business Days

Starting at $ 1,999.00 USD

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Starting at $ 1,999.00 USD

Add to Wish List

The ultimate in a racing flywheel and clutch! This was developed for use in our E36 and E46 World Challenge Touring Cars. The combined weight of the clutch and flywheel is only 11lbs!!!

This multi-disc (2 or 3 disc setups) offer a minimal flywheel mass (enough to include a factory ring gear for the starter) and a small 5.5" clutch assembly rated to 500hp. By saving as much weight as possible less energy is used in simply spinning the flywheel/clutch assembly and that means a lot more power and torque is available at the drive wheels. The flywheel and clutch is one of the first areas that engine builders address when making the rotating assembly lighter for race engines and this is among the most advanced and lightest racing clutch kits available for your BMW race car.

The JB Ultra-Light Performance racing clutch is available in 2-disc or 3-disc setups. We used the 5.5"/140mm size in our Touring Cars but larger sizes are available too. This is a turn-key racing clutch and flywheel kit that you don't have to engineer or spec yourself. This is the same clutch setup we used when winning the 2003 and 2004 Touring Car Championships - the quality and performance is unquestionable. That series also employed standing starts at each race and this clutch setup performed flawlessly with nearly a full season of racing on them before needing a change.

JB Ultra-Light flywheels include:

precision CNC machined aluminum flywheel

zero-balanced up to 10,000 RPM

replaceable hardened steel clutch friction surface

Helicoil threaded inserts

high-strength grade 10.9 hardware

multi-disc racing clutch with Performance racing pressure plate

JB Racing throw-out bearing with custom bobbin
This is a true racing clutch and will not function as a street-able clutch at all. It behaves as an on/off switch with no slippage allowed. Extreme care must be used when driving on to trailers and around the paddock. But when driven correctly the life span of this clutch is amazing - we could get a full season of racing a 300hp M54 from this clutch setup including standing starts at every race! Replacement clutch components and flywheel rebuilding are available.

A properly adjusted clutch stop is required for use with this clutch kit.

Stock Flywheel + Clutch Weight = 45+lbs
JB Ultra-Light Flywheel & Clutch Weight = 11lbs

This item fits the following BMWs:
1992-1999 E36 BMW 325i 325is 328i 328is M3
1999-2006 E46 BMW 323i 323ci 325i 325ci 328i 328ci 330i 330ci (5-speed)
1997-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Roadster M Coupe
2003-2005 E85 BMW Z4 2.5i (5-speed)

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E30 325e JB Racing Lightweight Aluminum Flywheel (Replaces Dual-Mass ...

T#:3749

Part#: 520-120-228

In Stock

$ 854.00 USD

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$ 854.00 USD

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Aluminum flywheels are much lighter than the stock steel flywheel and that produces better throttle response and more available horsepower to the wheels for faster acceleration. The JB Racing aluminum flywheels are a direct replacement for the stock flywheel and work with stock clutch components for an easy upgrade with very little downside.

Modern flywheels are built with additional components and features that are designed to dampen and minimize vibrations from the engine and transmission. As a result they have become bloated in weight and that means more energy is used up just making the flywheel spin. The weight difference between an aluminum and steel flywheel is huge - sometimes more than 50% less. Without the additional mass, more energy can be diverted to where it counts most - moving the car. The flywheel and clutch is one of the first areas that engine builders address when making the rotating assembly lighter for race engines. The dampening effect is just not needed on cars that are focused on performance.

In addition to releasing more power to the wheels, the lighter flywheel allows the engine to spin more freely, which improves throttle response. Again, the difference is huge as you watch the revs build faster than before. With the engine spinning easier the power band comes up much sooner. The stock steel flywheel feels lazy in comparison. There is a driving adjustment required to get used to how much faster the engine revs but that's not really a downside.

The JB lightweight flywheel is designed to be used with a factory organic clutch - the same clutch kit that you would get from any BMW dealer. This makes replacement clutch components easy to source and inexpensive when compared to specialized racing clutches. By using the factory BMW clutch, JB has also made the whole assembly easy to live with when used on the street. The clutch behaves the same as it originally did - just with better throttle response and more power! The JB flywheel can also be rebuilt with a new clutch contact surface - you don't have to buy a new flywheel.

Aluminum flywheels are considered 'single-mass' flywheels because they do not have the same dampening designs as an original 'dual-mass' flywheel. With a single-mass design more noise and vibration may be noticeable. There are steps you can take to minimize the noise - heavier weight transmission oil and clutch discs with anti-rattle springs (sprung-hub clutch).

The JB flywheel includes ignition trigger wheel.

This flywheel replaces the stock original dual-mass flywheel and should only be used with the corresponding 'dual-mass' clutch kit. According to BMW the dual mass flywheel was installed in all 325/325e from 5/86 on but we have seen some later cars with a single-mass flywheel. The age of the car almost guarantees one or more clutch replacements and possibly a change to the original flywheel as well. You may not know which flywheel is currently installed until the flywheel cover or the transmission is removed.

Stock Flywheel Weight = 27.5lbs
JB Flywheel Weight = 10.0lbs

This item fits the following BMWs:
1984-1988 E30 BMW 325e 325es (with dual mass flywheel)

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E30 325e JB Racing Lightweight Aluminum Flywheel (Replaces Single-Mas...

T#:3763

Part#: 520-070-228

Ships in 5 Business Days

$ 630.00 USD

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Qty

$ 630.00 USD

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Aluminum flywheels are much lighter than the stock steel flywheel and that produces better throttle response and more available horsepower to the wheels for faster acceleration. The JB Racing aluminum flywheels are a direct replacement for the stock flywheel and work with stock clutch components for an easy upgrade with very little downside.

Modern flywheels are built with additional components and features that are designed to dampen and minimize vibrations from the engine and transmission. As a result they have become bloated in weight and that means more energy is used up just making the flywheel spin. The weight difference between an aluminum and steel flywheel is huge - sometimes more than 50% less. Without the additional mass, more energy can be diverted to where it counts most - moving the car. The flywheel and clutch is one of the first areas that engine builders address when making the rotating assembly lighter for race engines. The dampening effect is just not needed on cars that are focused on performance.

In addition to releasing more power to the wheels, the lighter flywheel allows the engine to spin more freely, which improves throttle response. Again, the difference is huge as you watch the revs build faster than before. With the engine spinning easier the power band comes up much sooner. The stock steel flywheel feels lazy in comparison. There is a driving adjustment required to get used to how much faster the engine revs but that's not really a downside.

The JB lightweight flywheel is designed to be used with a factory organic clutch - the same clutch kit that you would get from any BMW dealer. This makes replacement clutch components easy to source and inexpensive when compared to specialized racing clutches. By using the factory BMW clutch, JB has also made the whole assembly easy to live with when used on the street. The clutch behaves the same as it originally did - just with better throttle response and more power! The JB flywheel can also be rebuilt with a new clutch contact surface - you don't have to buy a new flywheel.

Aluminum flywheels are considered 'single-mass' flywheels because they do not have the same dampening designs as an original 'dual-mass' flywheel. With a single-mass design more noise and vibration may be noticeable. There are steps you can take to minimize the noise - heavier weight transmission oil and clutch discs with anti-rattle springs (sprung-hub clutch).

The JB flywheel includes ignition trigger wheel.

This flywheel replaces the stock original single-mass flywheel and should only be used with the corresponding 'single-mass' clutch kit. According to BMW the single mass flywheel was installed in all 325e up to 5/86 production date but we have seen some later cars with a single-mass flywheel. The age of the car almost guarantees one or more clutch replacements and possibly a change to the original flywheel as well. You may not know which flywheel is currently installed until the flywheel cover or the transmission is removed.

Stock Flywheel Weight = 24.0lbs
JB Flywheel Weight = 8.5lbs

This item fits the following BMWs:
1984-1988 E30 BMW 325e 325es (with single mass flywheel)

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OS Giken E9X M3 Clutch Overhaul Kit (for Grand Am Legal Racing Flywhe...

T#:2209

Part#: BM533-BF6EA

Ships in 2 Business Days

$ 999.99 USD

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$ 999.99 USD

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This kit includes parts needed to overhaul the OS Giken E90/E92 M3 Grand Am legal clutch kit, including clutch discs (2), center plates, and cover bolts (all). As used in the Grand Am KONI Challenge GS class V8 M3s, including both Turner Motorsport E92 M3 race cars.

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JB Racing Aluminum Lightweight Flywheel - E9X M3

T#:5774218

Part#: 520-210-215

Ships in 5 Business Days

$ 1,106.00 USD

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Qty

$ 1,106.00 USD

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Aluminum flywheels are much lighter than the stock steel flywheel and that produces better throttle response and more available horsepower to the wheels for faster acceleration. The JB Racing aluminum flywheels are a direct replacement for the stock flywheel and work with stock clutch components for an easy upgrade with very little downside.

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MINI R Chassis OS Giken Clutch Kit - STR Series

T#:30164597

Part#: MN023-BJ5

Back Ordered

$ 1,920.00 USD

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Qty

$ 1,920.00 USD

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MINI R Chassis OS Giken Clutch Kit - STR Series enhances performance and durability for your BMW or MINI. This high-performance clutch kit from OS Giken is designed specifically for MINI R chassis models, offering improved torque capacity and durability. With its STR series design, it ensures smooth engagement and precise control, perfect for both street and track applications. Engineered with high-quality materials, this clutch kit provides reliable performance under demanding conditions.

Enhances performance and durability
Designed specifically for MINI R chassis models
Improved torque capacity for enhanced power transfer
STR series design ensures smooth engagement
Suitable for both street and track use

Upgrade your BMW or MINI R chassis with the MINI R Chassis OS Giken Clutch Kit - STR Series for superior clutch performance and reliability.

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OS Giken Clutch Kit - Grand Touring Series - Mini R5X

T#:23383349

Part#: MN023-AQ6

Ships in 2 Business Days

$ 1,680.00 USD

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Qty

$ 1,680.00 USD

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Introducing the Mini Grand Touring Clutch, a revolutionary addition to the clutch lineup. This clutch incorporates cutting-edge technology from our Racing Multi-plate Clutches, enhanced further by our exclusive "floating pressure system." Say goodbye to rough and noisy drives - experience a seamless and chatter-free driving sensation. The Mini Grand Touring Clutch is offered in both single and twin plate configurations, with options for soft or hard clutch covers to cater to various engine outputs. Achieve a maximum torque of 315 FT/LBS with this innovative clutch.

Incorporates advanced "floating pressure system" for a smooth driving experience
Retains technology from Racing Multi-plate Clutches
Available in single and twin plate configurations
Options for soft or hard clutch covers to suit engine output

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E46 M3 JB Racing Ultra-Light Racing Clutch/Flywheel Assembly ...

T#:340510

Part#: WCCLUTCH-E46M3

Ships in 5 Business Days

Starting at $ 2,015.99 USD

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Starting at $ 2,015.99 USD

Add to Wish List

The ultimate in a racing flywheel and clutch! This was developed for use in our E36 and E46 World Challenge Touring Cars. The combined weight of the clutch and flywheel is only 11lbs!!!

This multi-disc (2 or 3 disc setups) offer a minimal flywheel mass (enough to include a factory ring gear for the starter) and a small 5.5" clutch assembly rated to 500ft-lbs. By saving as much weight as possible less energy is used in simply spinning the flywheel/clutch assembly and that means a lot more power and torque is available at the drive wheels. The flywheel and clutch is one of the first areas that engine builders address when making the rotating assembly lighter for race engines and this is among the most advanced and lightest racing clutch kits available for your BMW race car.

The JB Ultra-Light Performance racing clutch is available in 2-disc or 3-disc setups. A 3-disc setup is less susceptible to heat and will have a higher torque capacity. On our M54-powered 325i Touring Cars (approximately 300hp) we used the 5.5"/140mm 2-disc configuration. The 5.5" clutch was a perfect blend of performance and durability. It wasn't too small to suffer from high temperatures and wasn't too large that it couldn't be slipped (slipping prevents damage to other components). This is a turn-key racing clutch and flywheel kit that you don't have to engineer or spec yourself. This is the same clutch setup we used when winning the 2003 and 2004 Touring Car Championships - the quality and performance is unquestionable. That series also employed standing starts at each race and this clutch setup performed flawlessly with nearly a full season of racing on them before needing a change.

JB Ultra-Light flywheels include:

precision CNC machined aluminum flywheel

zero-balanced

replaceable hardened steel clutch friction surface

Helicoil threaded inserts

high-strength grade 10.9 hardware

multi-disc Sachs or Powertrain Technology racing clutch with racing pressure plate

JB Racing throw-out bearing with custom bobbin
This is a true racing clutch and will not function as a street-able clutch at all. It behaves as an on/off switch with no slippage allowed. Extreme care must be used when driving on to trailers and around the paddock. But when driven correctly the life span of this clutch is amazing - we could get a full season of racing a 300hp M54 from this clutch setup including standing starts at every race! Replacement clutch components and flywheel rebuilding are available.

A properly adjusted clutch stop is required for use with this clutch kit.

Stock Flywheel + Clutch Weight = 45+lbs
JB Ultra-Light Flywheel & Clutch Weight = 11lbs

This item fits the following BMWs:
2001-2006 E46 BMW M3

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OS Giken Clutch Kit - STR Series - R52, R53

T#:54388380

Part#: MN021-BJ5

Ships in 2 Business Days

$ 1,920.00 USD

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Qty

$ 1,920.00 USD

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Upgrade your drivetrain and experience the perfect balance of track performance and street drivability.

Lightweight Aluminum Flywheel - BMW E30 325i/x M20

T#:5774217

Part#: 520-065-228

Ships on Sep 8, 2026

$ 630.00 USD

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Qty

$ 630.00 USD

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Aluminum flywheels are much lighter than the stock steel flywheel and that produces better throttle response and more available horsepower to the wheels for faster acceleration. The JB Racing aluminum flywheels are a direct replacement for the stock flywheel and work with stock clutch components for an easy upgrade with very little downside.

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OS Giken Clutch Kit - STR Series - R55 to R61

T#:22756718

Part#: MN023-AJ6

Back Ordered

$ 1,490.00 USD

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Qty

$ 1,490.00 USD

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Upgrade Your Clutch for Spirited Driving with STR Clutch

Elevate your driving experience with the STR Clutch, perfect for those who enjoy spirited driving and require a balance between street and occasional race performance. While it may differ from a Factory Dual Mass Clutch, the STR Clutch comes in single and twin plate configurations, paired with a unique clutch cover to maintain a factory clutch pedal feel. This ensures a race-ready clutch that's also easy to handle in everyday driving situations.

Key Features:

Available in single and twin plate configurations
Unique clutch cover for a factory-like pedal feel
Suitable for spirited driving and occasional racing
Dampened Single Plate with Soft Diaphragm
Release Assembly included
Maximum capacity: 285 FT/LBS TORQUE

Upgrade your clutch and enjoy the performance and versatility of the STR Clutch.

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Project Cars

SELECT YOUR BMW

E36, E46 JB Racing Ultra-Light Racing Clutch/Flywheel Assembly ...

E30 325e JB Racing Lightweight Aluminum Flywheel (Replaces Dual-Mass ...

E30 325e JB Racing Lightweight Aluminum Flywheel (Replaces Single-Mas...

OS Giken E9X M3 Clutch Overhaul Kit (for Grand Am Legal Racing Flywhe...

JB Racing Aluminum Lightweight Flywheel - E9X M3

MINI R Chassis OS Giken Clutch Kit - STR Series

OS Giken Clutch Kit - Grand Touring Series - Mini R5X

E46 M3 JB Racing Ultra-Light Racing Clutch/Flywheel Assembly ...

OS Giken Clutch Kit - STR Series - R52, R53

Lightweight Aluminum Flywheel - BMW E30 325i/x M20

OS Giken Clutch Kit - STR Series - R55 to R61

Upgrade Your Clutch for Spirited Driving with STR Clutch

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