PMC Motorsport Lightweight aluminum (rigid / stiff /  / single-mass) custom flywheel for BMW B58 - 6,34kg / 13,98lb

PMC Clutch – precise solutions for mechanical tuning and motorsport. Lightweight aluminum rigid flywheel with replaceable friction surface for BMW B58 engines.

The lower inertia of a lightweight flywheel results in significantly better and faster throttle response, improving the car's acceleration. Although it does not increase engine power, it reduces losses in the drivetrain, which translates to slightly higher power at the wheels. Lightweight flywheels perform exceptionally well on twisty tracks, as the car regains speed lost in corners much faster.

Applications:

• Drift / Time Attack: Where precise control over engine RPM and rapid reduction of unsprung mass are crucial.
• Street Tuning: For enthusiasts looking to eliminate the failure-prone dual-mass flywheel and experience a sportier vehicle character.
• Motorsport: Wherever every second and every kilogram of weight reduction matters for the final result.

Advantages of a lightweight flywheel:

• Instant throttle response: Reducing rotating mass allows the engine to rev up much faster, improving dynamics during gear changes and overtaking.
• Increased durability in sports: Made from the highest quality aerospace aluminum alloy, the wheel is resistant to extreme temperatures and loads that could damage a factory dual-mass flywheel.
• Serviceability (Replaceable disc): Thanks to the replaceable steel friction surface, this wheel is a long-term solution – when worn, you only replace the friction plate, not the entire element.
• Ease of installation (Bolt-on): Designed for factory mounting points, ensuring full compatibility with the stock pressure plate and starter without modifications.

>Weight

When designing our flywheels, we pay great attention to their weight – PMC flywheels are created for both tuning enthusiasts and motorsport builders, which is why selecting the right mass is so important.

Inertia vs. Acceleration

A flywheel stores kinetic energy. The heavier it is, the more energy is required to set it in motion.

• Too light: The engine revs up instantly, which is desirable in sports, but drops just as quickly. This can make smooth gear changes difficult in daily driving.
• Correctly balanced: Allows for faster throttle response while retaining enough energy for the engine to operate properly after letting off the accelerator pedal.

Idle Stability

A lightweight flywheel has a lower capacity to dampen engine irregularities (especially in 3- or 4-cylinder units).

• If the weight is too low, the engine may idle roughly, jerk, or even stall during sudden declutching (e.g., when approaching traffic lights).
• Appropriate mass provides an "inertia buffer" that maintains crankshaft rotation between the power strokes of individual pistons.

Ease of Starting (Torque)

A heavy wheel helps "set the mass" of the entire vehicle in motion from a standstill.

• With an extremely light wheel, the driver must apply more throttle and operate the clutch more precisely to avoid stalling the engine when starting.
• The right choice of weight allows the car to maintain its civilized character, enabling smooth starts on hills or in traffic jams.

Specification

!! 61,11% Lighter than the OE flywheel !! Only 6,34kg / 13,98lb, which is approx. 9,96kg / 21,96lb less than the factory wheel

• Compatibility: PMC custom flywheels are designed to work with OE BMW clutch kits or their replacements fitting the OE flywheel.
• Clutch Disc: Designed for use with factory clutch discs compatible with your gearbox.
• Replaceable friction surface: The PMC flywheel friction surface ensures durability and long-term operation. In case of wear, it is easy to disassemble, and replacement parts are available in our offer.
• Original starter ring gear: Galvanized ring gear, with hardness identical to OE flywheels, ensuring reliability and full cooperation with the OE starter.
• Balanced before shipping: Every PMC flywheel is checked and precisely balanced before shipping. If you are using a used or custom clutch kit, we recommend rebalancing the entire set.

Please note that a lightweight flywheel provides uncompromising throttle response at the cost of eliminating factory damping elements. This translates into more direct drivetrain operation, which may result in a natural increase in the audibility of gearbox mechanisms. This is a desired characteristic in sports vehicles, resulting from the rigid connection of the engine to the drive.

 

Professionalism

From design to implementation, our parts go a long way. Every component for which we produce parts has been measured by us using a measuring arm and a 3D scanner. The prototype undergoes numerous tests to eliminate all possible problems in its use. For our production, we only use certified materials from proven suppliers. We have a modern CNC machine park and experienced employees.

Perfect Coaxiality

Our adapters guarantee a perfect fit between the engine and the gearbox.

 

Made in Poland

Our entire production and design department are located in Poland. More than 90% of the elements are manufactured by us.

Assistance in selection and after-sales support

The PMC Motorsport team will help you choose the right set for you. In case of any doubts during installation, we provide technical support. You can contact us via Facebook, Instagram, and the contact form.

Purchase of individual components

We offer every element of our kits separately. If you need a replacement part, write to us through the contact form.

Fast worldwide shipping

We ship our products to almost all countries in the world. Shipping costs for European Union countries (excluding islands) and the UK are calculated automatically. For countries not on the list, after placing an order, our team will calculate the shipping cost and add it to the order. You will receive an email with the total cost.
!!! ATTENTION: The provided shipping quote with the product price does not include additional fees / customs duties that may occur depending on the destination country. !!!

0% VAT

0% VAT for customers with an active European VAT number (option for B2B customers from outside Poland). After positive verification in the VIES system, we modify the order by removing the calculated VAT.

 

Experience

Thousands of manufactured adapters and satisfied customers worldwide. PMC Motorsport adapters are used in daily cars as well as in professional projects intended for competitive motorsport.

Quality confirmed by certificate

From the beginning, we have focused on the quality of the parts we manufacture. After each production stage, the component is inspected. Every component we produce is engraved with a production serial number. We confirm quality with the ISO PN-EN ISO 9001:2015 certificate.