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Spec Clutch SB53S-4 Steel Flywheel SFI Certified CNC Billet

(2002-2003 Acura TL Type-S; 2009-2012 BMW 335i; 2010-2012 BMW 535i; 2010-2012 BMW 535i xDrive; 2010-2012 BMW 135i)

Manufacturer

Picture for manufacturer Spec Clutch

Part Number

SB53S-4
17 reviews
Sale Price

$579.27

Estimated ship date Tuesday, November 24

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Fitment guaranteed

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Product Details

The SPEC SB53S-4 Steel Flywheel is a high-performance, CNC-machined billet steel flywheel engineered to deliver superior clutch performance in both street and competition applications. Compatible with stock or stock-style self-ratcheting pressure plates, this flywheel is a direct-fit upgrade designed to maximize clutch life, power transfer, and drivetrain reliability.

Precision CNC Manufacturing:

SPEC flywheels are CNC manufactured to an industry-leading .001-inch tolerance — ten times tighter than the industry-standard .010 tolerance. This exceptional precision ensures perfect rotational balance and a perfectly flat friction surface for the clutch disc, reducing vibration, improving clutch engagement consistency, and enhancing safety in high-performance and competitive environments.

Key Features:

  • SFI Certified — meets rigorous safety standards for competition use
  • CNC machined to .001-inch tolerance for perfect balance and flatness
  • High carbon billet steel construction for durability and optimal inertia
  • Rebuildable design with replaceable steel friction plate for extended service life
  • Friction-enhancing steel friction surface specially formulated for optimum clutch bedding and holding power
  • Compatible with stock or stock-style self-ratcheting pressure plates
  • Engineered for optimized Moment of Inertia (MOI) to maximize vehicle performance

Why the Flywheel Matters:

The flywheel plays three critical roles in drivetrain performance: providing a consistent, friction-enhancing surface for the clutch disc; contributing the correct rotational inertia to balance power delivery and acceleration; and maintaining true dimensional balance at all RPM levels to eliminate harmful vibration and power loss. SPEC invests heavily in research and development to optimize flywheel weight and dimensions across all performance and racing applications.

The SPEC SB53S-4 steel flywheel offers a medium-weight inertia option suited for a wide range of driving styles and racing disciplines, delivering the precise MOI tuning needed to get the most from your engine's powerband.

Products specifications

Fits

2002-2003 Acura TL Type-S; 2009-2012 BMW 335i; 2010-2012 BMW 535i; 2010-2012 BMW 535i xDrive; 2010-2012 BMW 135i

FW Weight

25lbs

product was as shown

Found the part quickly, ordered in minutes without getting the run around.

Super fast shipping, good tire. Will order again.

Exactly what I ordered and quick

Easy to use

I had never heard of Autoplicity until I started shopping for an exhaust. I didn't think I was going to find the one I wanted at a decent price. Not only did they have my exhaust at a screaming deal, they had it to my door in perfect shape in 6 days including the evening of purchase and a weekend. I'll definitely look at buying from them again.

I found what I was in need of thank you for making the search easy and done.

Autoplicity had my hard to find parts for my 67 ford in stock.

Very easy so far.

It was very fast and easy to get around. Good Job with you site.

Best price I found online, I ordered it late Friday and they shipped it on Monday. I would definitely use this site again for future automobile and Motorcycle purchases.

WAS QUICK & EASY

So far, so good.

Haven't installed item yet so this rating is based on the service as of now.

Super Low Prices Fast shipping and they have all kinds of mods parts. I am a bargain shopper and i am super satisfied with price and shipping cost take that FLEE BAY!!!!

the amazon payment did not work; hope I don't get double billed since I went with paypal afterwards. Meanwhile, I could not verify that my amazon order is cancelled/never placed.

This caliper paint green and cool.

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