SPEC BMW N54 Single Mass Flywheel (SMF) - OEM Fitment Lightweight Billet Aluminium or Steel Upgrade for 135i, 335i & 335d (2007-2012)

Direct-fit one piece flywheel upgrade for BMW 135i, 335i and 335d

Unlock faster revs, cleaner shifts and a crisper pedal with this SPEC solid flywheel for BMW E8x and E9x models. Machined from billet alloy or billet steel, this driveline upgrade replaces the heavy dual mass unit with a precise, responsive setup that works with the factory-style self-adjusting pressure plate and SPEC factory-type clutch kits. Ideal for fast road and track use, yet refined enough for daily driving when paired with the right clutch.

Key benefits

• Factory-fit installation on manual BMW N54 platforms and compatible 3 Series diesel applications listed below
• Solid mass design reduces rotational inertia for quicker engine response and sharper acceleration
• Billet aluminium option around 15 lb for maximum pick-up and rev-happy feel
• Billet steel option around 25 lb for added momentum and smooth drivability between gears
• Alloy version includes a heat-treated wear plate for durability
• Works with the original self-adjusting pressure plate design and SPEC OEM-type clutch kits
• Supplied with a billet pilot pin and high-strength fasteners for a hassle-free install

We have fitted and run these on our own projects and the transformation in response and gear engagement is outstanding. Customers consistently report a more connected driving experience and improved confidence under hard use.

What you receive

• SPEC one piece flywheel in your choice of billet aluminium or billet steel
• Billet pilot pin
• Race bolt kit

Note: Not compatible with E82 1M, which uses an N55-type gearbox.

Vehicle applications

• BMW 135i 3.0 N54 2007 to 2009
• BMW 135i 3.0 N54 2009 to 2012
• BMW 335i 3.0 2007 to 2009
• BMW 335i 3.0 2009 to 2012
• BMW 335d 3.0 2007 to 2009
• BMW 335d 3.0 2009 to 2012

Part numbers

• SB53S 2007 to 2009 Steel
• SB53A
• SB53S-4
• SB53A-4

Recommended pairings

Combine with a SPEC factory-style clutch kit for a cohesive, direct-fit clutch and flywheel package. Seeking an even more linear pedal feel at higher power levels? Consider the SPEC non-SAC Cup kit with flywheel from our range for 335i and 335d.

Professional fitting and support

For installation, speak to MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk. Our team has extensive hands-on experience with BMW N54 driveline upgrades.

Fitment check before dispatch

We verify compatibility before shipping. Add your UK registration or the last 7 of your VIN at checkout and we will confirm the correct application for your 135i, 335i or 335d.

Search terms to help you find the right part

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Manufactured by: SPEC