Spec 07-10 BMW 335i/135i Aluminum Flywheel *For Use With Spec SB53x-2 Clutch Kits Only*
The SPEC SB53A-2 is a billet aluminum flywheel for early N54 twin-turbo BMWs with the six-speed manual: the E9x 335i and E8x 135i built through January 2009, plus the E60 535i and Z4 35i from the same production window. Owners usually land here because the factory dual-mass flywheel is rattling at idle or shuddering on takeoff, or because they are installing a SPEC SB53x-2 clutch kit, which requires a SPEC billet flywheel. It ships same business day from the USA.
The flywheel bolts to the crankshaft and gives the clutch disc its friction face. BMW fitted these cars with a dual-mass flywheel that has internal springs to soak up engine pulses. Those springs wear, and once they do, the flywheel knocks at idle and lets the drivetrain shunt. SPEC replaces it with a one-piece billet flywheel, so there is nothing inside to wear out. SPEC lists the SB53A-2 at 16 lb.
The trade-off is honest: a solid flywheel passes more gear rattle and vibration into the cabin than a healthy dual-mass unit, and the lighter aluminum mass lets revs rise and fall faster. Most tuned N54 owners accept that for the sharper response and the end of dual-mass failures. If you would rather have a heavier steel wheel, SPEC also makes the SB53S-2 steel flywheel for the same cars.
Listen at idle in neutral, then press the pedal. If the rattle stops or changes, the dual-mass flywheel is the likely source. Check clutch slip with a load test in fourth gear near 2,500 rpm; our slipping diagnosis guide covers the details. With the gearbox out, a dual-mass flywheel that rocks or turns freely between its two halves is worn.
SPEC splits the N54 cars at the January 2009 production date. The SB53A-2 is for:
Cars built from February 2009, and the 2011-2013 335is, use the SB53A-3 flywheel. Our listing title reads 2007-2010, so check the production date on the door jamb sticker, not just the model year. This flywheel works only with SPEC's non-ratcheting -2 clutch kits, not the factory self-adjusting clutch. Send us your VIN if you are unsure.
| Brand | SPEC |
| Part number | SB53A-2 |
| Fits | Spec 07-10 BMW 335i/135i Aluminum Flywheel *For Use With Spec SB53x-2 Clutch Kits Only* |
| Vehicle fitment | BMW 335I/135I Aluminum (2007-2010) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
It depends on production date. SPEC lists SB53A-2 for N54 cars built through January 2009 and SB53A-3 for cars built from February 2009 plus the 2011-2013 335is. Check the build date on the driver door jamb or send us your VIN.
No. SPEC lists it for its non-ratcheting -2 clutch kits only, such as SB531-2, SB532-2 and SB533-2. The factory self-adjusting clutch is not meant for it.
SPEC lists the SB53A-2 at 16 lb. It is a one-piece billet flywheel with no internal springs.
Expect more gear rattle at idle and more drivetrain vibration than a healthy dual-mass flywheel. That is normal with a solid flywheel.
A matching SPEC -2 clutch kit, new flywheel bolts, and usually the rear main seal if it shows any leak. Bleed the clutch hydraulics with fresh fluid when you finish.
