PMC Motorsport flywheel / adapter BMW M50 S50 M52 S52 M54 S54 – 6-speed manual BMW N54 ZF GS6-53BZ (135i / 335i / 535i) – Ø215mm / 8.46" – Twin disc clutch

The custom PMC Motorsport flywheel allows you to mate inline BMW M50, M52, M54 and S50, S52, S54 engines with the manual 6-speed ZF GS6-53BZ transmission used in N54-powered BMWs (E8x 135i, E9x 335i, E60 535i, Z4 35i). The flywheel is designed for a 215 mm twin disc clutch kit from the BMW E9x M3 V8. The transmission bellhousing fits these engine blocks directly, so no additional gearbox adapter plate is required – installation is virtually plug & play.

Planning to replace the 5-speed transmission in your BMW E30, E36, E46, E34, E39, or Z3 with a stronger 6-speed GS6-53BZ transmission from an N54? Want to build a high-power drift, track, or daily driver car with an M50 / M52 / M54 or S50 / S52 / S54 engine? Our twin disc clutch flywheel is the perfect solution for high-power builds, allowing you to utilize the durable 335i gearbox in your project.

The PMC Motorsport flywheel is made of aluminum and features a replaceable steel friction face. Every flywheel is inspected and balanced before shipment. It is designed for the twin disc clutch kit SACHS XTend 3000 950 709 (215 mm / 8.46") from the BMW E9x M3 V8. Twin friction discs can transmit significantly higher torque than a single disc clutch of the same diameter, making this setup ideal for turbocharged, drift, and track cars.

PMC Motorsport parts are synonymous with precision and premium quality. A design process based on 3D scanning and inspection using a coordinate measuring arm ensure a perfect fit. Production on modern CNC machines guarantees ideal concentricity between the engine and transmission, which is crucial for the longevity of the drivetrain.

Additional information

Installation Instructions

To join a BMW M50 / M52 / M54 / S50 / S52 / S54 engine with a ZF GS6-53BZ transmission, no adapter plate is needed. The two top bolt holes of the GS6-53BZ gearbox must be clearanced slightly for proper alignment – this modification does not affect the centering of the engine and transmission.

The flywheel is bolted to the crankshaft using the included bolts, and the twin disc pressure plate is secured with the provided pressure plate bolts. The OEM starter motor is retained (BMW OE). When installing the twin disc kit, the release bearing must be shortened as shown in the diagram below.

Frequently Asked Questions

Which engines fit this flywheel?

It fits BMW inline engines: M50 (M50B20, M50TUB20, M50B25, M50TUB25), M52 (M52B20, M52B25, M52B28 and TU versions), M54 (M54B22, M54B25, M54B30), S50 (S50B30, S50B32), S52 (S52B32), and S54 (S54B32).

Which gearboxes fit this flywheel?

It fits 6-speed manual ZF GS6-53BZ gearboxes from N54 BMW models in HGX (THGX), JGD (TJGD), JGF (TJGF), JGK (TJGK), and GS6X53BZ HGY (THGY) variants – found in BMW E8x 135i, E9x 335i, E60 535i, and Z4 35i.

Is a gearbox adapter plate required?

No. Connecting a BMW M50 / M52 / M54 / S50 / S52 / S54 engine to a GS6-53BZ transmission from an N54 does not require an adapter plate. Installation is virtually plug & play – you only need to trim/clearance the two top mounting holes on the gearbox, which does not affect engine-to-transmission centering.

Which starter motor should be used?

With the PMC Motorsport flywheel, you keep the factory BMW OE starter motor from your M50 / M52 / M54 / S50 / S52 / S54 engine, e.g., BMW OE 12 41 2 354 709, 12 41 1 740 379, 12 41 2 344 247, 12 41 1 740 378, 12 41 1 740 375, 12 41 1 738 602, 12 41 1 466 102, 12 41 1 712 937, 12 41 1 735 524, 12 41 1 738 604 or 12 41 1 715 238. The starter motor is not included in the kit.

Which clutch kit fits the PMC flywheel?

The flywheel is designed for the 215 mm (8.46") twin disc clutch kit from the BMW E9x M3 V8 – SACHS XTend 3000 950 709 (3000.950.709-S). The clutch discs must have splines that match your transmission – for the ZF GS6-53BZ, it is 32.5x35-26N.

What additional parts do I need to purchase for installation?

You need the twin disc clutch kit SACHS XTend 3000 950 709 (which includes the release bearing) and a clutch slave cylinder specific to your transmission. These components are not included in the kit.

Do I need to modify the release bearing or transmission?

Yes. When installing the twin disc kit, you must shorten the release bearing and clearance the two top holes of the GS6-53BZ gearbox. The required modifications are shown in the graphics in the "Installation Instructions" section.

What is included in the kit?

A custom PMC Motorsport flywheel with a replaceable friction surface, crankshaft bolts, and pressure plate mounting bolts.

Can I purchase only the flywheel or individual components separately?

Yes. Every component of our kits can be purchased individually.

Does the price include customs duty for shipments outside the European Union?

No. Product prices and shipping quotes do not include customs duties or import fees that may apply in the destination country.

Can I buy with 0% VAT?

Yes, if you are a B2B customer outside Poland with an active EU VAT number (verified via VIES) or if the order is exported outside the EU.

Are the included instructions sufficient for complete installation?

The manual covers mating the engine to the transmission outside the vehicle. Depending on the car, extra modifications may be required (mounts, bushings, firewall, transmission tunnel, driveshaft length). We recommend installation by professional technicians.

Please note that a rigid single-mass flywheel delivers uncompromised throttle response at the expense of factory dampening elements. This results in a more direct drivetrain connection, which may naturally increase gear noise transmission from the gearbox. This is an expected and desirable characteristic in performance vehicles resulting from a solid engine-drivetrain link.