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Spec Clutch SB53S Steel Flywheel SFI Certified CNC Billet

(2005-2006 Acura RSX Type-S; 1986-2001 Acura Integra; 2007-2009 BMW 335i; 2007-2009 BMW 535i; 2007-2009 BMW 535i xDrive; 2007-2009 BMW 135i; 2011-2012 BMW 335is)

Manufacturer

Picture for manufacturer Spec Clutch

Part Number

SB53S
18 reviews
Sale Price

$577.50

Estimated ship date Friday, November 27

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Fitment guaranteed

Fitment guaranteed

Product Details

The Spec Clutch SB53S is a high carbon billet steel flywheel CNC machined to an industry-leading .001" tolerance — ten times tighter than the industry standard of .010". This precision manufacturing delivers perfect rotational balance and a perfectly flat clutch disc bedding surface, both critical for consistent clutch performance and safety in competitive driving environments. The SB53S carries SFI certification, making it suitable for sanctioned racing applications.

This steel flywheel is compatible with stock or stock-style self-ratcheting pressure plates, offering a direct-fit upgrade path without requiring a full clutch system overhaul.

Key Features:

  • CNC machined to .001" tolerance for superior balance and surface flatness
  • High carbon billet steel construction for durability and optimized inertia
  • Replaceable steel friction plate made from friction-enhancing alloy for optimal clutch bedding and holding power
  • Rebuildable design extends service life and reduces long-term cost
  • SFI certified for use in sanctioned racing environments
  • Compatible with stock or stock-style self-ratcheting pressure plates
  • Engineered moment of inertia (MOI) optimized by Spec's in-house R&D program

The flywheel plays a three-part role in drivetrain performance: it provides a consistent friction surface for the clutch disc, contributes the correct rotational inertia to balance power delivery against acceleration, and maintains true dimensional balance at all RPM levels to eliminate vibration and protect engine components. Spec engineers each flywheel's weight and dimensions specifically to maximize Moment of Inertia (MOI) for the intended application — whether street performance or competitive racing.

Products specifications

Fits

2005-2006 Acura RSX Type-S; 1986-2001 Acura Integra; 2007-2009 BMW 335i; 2007-2009 BMW 535i; 2007-2009 BMW 535i xDrive; 2007-2009 BMW 135i; 2011-2012 BMW 335is

FW Weight

25lbs

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Great job

easy so far.. now we'll see if it get here 2 days.... thank you

I did enjoy shopping and ordering the items from this place , ordering it was quick and easy,thank you.

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Good as expected

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beating rockauto

Incredibly low prices and fast shipping. I bought shocks and struts for my truck and saved more than 35% over what my local parts store wanted!!! I made the mistake of not setting up my account before placing my order so I didn't get confirmation right away, but one quick phone call fixed that. Great customer service.

Easy and fast

Autoplicity was plenty cheaper than competitors for the springs I needed. I was shopping around and left the website after beginning a transaction and they sent me a coupon for 25% off shipping if I would return and purchase from them, which was cool. Unfortunately the coupon code didn't change the price and I didn't receive 25% off, but it was still cheaper than others.

great pricing

Cheapest price on Eibach springs on the internet! Close to 50-75 dollars cheaper than the rest who have similar user ratings. Fast shipping! Good email communication from order start, shipping to delivery. Would recommend to anyone.

I like that I could use my Amazon account.

quick, easy

good so far

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