{"product_id":"act-xact-flywheel-promass-2009-2016-bmw-135i-335i-435i-535i-z4-601030","title":"ACT XACT Flywheel ProMass, 2009-2016 BMW 135i\/335i\/435i\/535i\/Z4 (N54\/N55) | 601030","description":"\u003cp\u003eThe ACT XACT Flywheel ProMass is a one-piece forged flywheel engineered as a single-mass conversion for BMW's 6-bolt N54\/N55 dual-mass crankshaft, delivering improved engine response and acceleration while keeping gear rattle to a minimum for a more daily-driveable feel than a Streetlite flywheel. The forging is heat-treated for strength and toughness, and the ring gear is induction-hardened for maximum service life. One-piece construction eliminates the failure points found in multi-piece flywheels and provides uniform, efficient heat transfer away from the clutch disc, so there are no warped inserts or loose ring gears to deal with. Each flywheel is forged, CNC-machined, and dynamically computer-balanced for smooth, reliable operation at high RPM, and is SFI 1.1 certified.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/d32vzsop7y1h3k.cloudfront.net\/9aea4a88ee91500c37a766fcb5c28a21.PDF\"\u003eWarranty\u003c\/a\u003e\u003cbr\u003e\u003ca href=\"https:\/\/d32vzsop7y1h3k.cloudfront.net\/d856e10aab4787d29e6c192d62ac3288.PDF\"\u003eInstallation Instructions\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003eBacked by ACT's one-year \"Excellence in Performance\" warranty.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: XACT Flywheel ProMass\u003c\/li\u003e\n\u003cli\u003eConstruction: One-piece forged, CNC-machined, dynamically computer-balanced single-mass conversion\u003c\/li\u003e\n\u003cli\u003eCrankshaft Fitment: 6-bolt N54\/N55 crankshaft\u003c\/li\u003e\n\u003cli\u003eRing Gear: Induction-hardened for extended service life\u003c\/li\u003e\n\u003cli\u003eSFI Rating: SFI 1.1 certified\u003c\/li\u003e\n\u003cli\u003eRecommended Use: Street and race, reduced gear rattle vs. Streetlite\u003c\/li\u003e\n\u003cli\u003ePart Number: 601030\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eVehicle Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2009 BMW 135i\u003c\/li\u003e\n\u003cli\u003e2010 BMW 135i\u003c\/li\u003e\n\u003cli\u003e2011 BMW 135i\u003c\/li\u003e\n\u003cli\u003e2012 BMW 135i\u003c\/li\u003e\n\u003cli\u003e2013 BMW 135i\u003c\/li\u003e\n\u003cli\u003e2009 BMW 335i\u003c\/li\u003e\n\u003cli\u003e2010 BMW 335i\u003c\/li\u003e\n\u003cli\u003e2011 BMW 335i\u003c\/li\u003e\n\u003cli\u003e2012 BMW 335i\u003c\/li\u003e\n\u003cli\u003e2013 BMW 335i\u003c\/li\u003e\n\u003cli\u003e2014 BMW 335i\u003c\/li\u003e\n\u003cli\u003e2015 BMW 335i\u003c\/li\u003e\n\u003cli\u003e2009 BMW 335i xDrive\u003c\/li\u003e\n\u003cli\u003e2010 BMW 335i xDrive\u003c\/li\u003e\n\u003cli\u003e2011 BMW 335i xDrive\u003c\/li\u003e\n\u003cli\u003e2012 BMW 335i xDrive\u003c\/li\u003e\n\u003cli\u003e2013 BMW 335i xDrive\u003c\/li\u003e\n\u003cli\u003e2014 BMW 335i xDrive\u003c\/li\u003e\n\u003cli\u003e2015 BMW 335i xDrive\u003c\/li\u003e\n\u003cli\u003e2011 BMW 335is\u003c\/li\u003e\n\u003cli\u003e2012 BMW 335is\u003c\/li\u003e\n\u003cli\u003e2013 BMW 335is\u003c\/li\u003e\n\u003cli\u003e2014 BMW 435i\u003c\/li\u003e\n\u003cli\u003e2015 BMW 435i\u003c\/li\u003e\n\u003cli\u003e2016 BMW 435i\u003c\/li\u003e\n\u003cli\u003e2014 BMW 435i xDrive\u003c\/li\u003e\n\u003cli\u003e2015 BMW 435i xDrive\u003c\/li\u003e\n\u003cli\u003e2016 BMW 435i xDrive\u003c\/li\u003e\n\u003cli\u003e2009 BMW 535i\u003c\/li\u003e\n\u003cli\u003e2010 BMW 535i\u003c\/li\u003e\n\u003cli\u003e2011 BMW 535i\u003c\/li\u003e\n\u003cli\u003e2012 BMW 535i\u003c\/li\u003e\n\u003cli\u003e2013 BMW 535i\u003c\/li\u003e\n\u003cli\u003e2014 BMW 535i\u003c\/li\u003e\n\u003cli\u003e2009 BMW 535i xDrive\u003c\/li\u003e\n\u003cli\u003e2010 BMW 535i xDrive\u003c\/li\u003e\n\u003cli\u003e2009 BMW Z4 sDrive35i\u003c\/li\u003e\n\u003cli\u003e2010 BMW Z4 sDrive35i\u003c\/li\u003e\n\u003cli\u003e2011 BMW Z4 sDrive35i\u003c\/li\u003e\n\u003cli\u003e2012 BMW Z4 sDrive35i\u003c\/li\u003e\n\u003cli\u003e2013 BMW Z4 sDrive35i\u003c\/li\u003e\n\u003cli\u003e2014 BMW Z4 sDrive35i\u003c\/li\u003e\n\u003cli\u003e2015 BMW Z4 sDrive35i\u003c\/li\u003e\n\u003cli\u003e2016 BMW Z4 sDrive35i\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003ch5\u003eWhat does the ACT 601030 flywheel fit?\u003c\/h5\u003e\u003cp\u003eThe 601030 fits BMW's N54\/N55-powered 135i, 335i, 335i xDrive, 335is, 435i, 435i xDrive, 535i, 535i xDrive, and Z4 sDrive35i across the 2009-2016 model years. See the full Vehicle Applications list above to confirm your specific year and trim.\u003c\/p\u003e\u003ch5\u003eWhat is a ProMass flywheel and how is it different from a Streetlite flywheel?\u003c\/h5\u003e\u003cp\u003eThe ProMass is a single-mass flywheel conversion engineered specifically for BMW's 6-bolt N54\/N55 dual-mass crankshaft, tuned to keep gear rattle to a minimum for a smoother, more daily-driveable feel than a Streetlite flywheel while still shedding rotating mass compared to the stock dual-mass unit.\u003c\/p\u003e\u003ch5\u003eDoes the 601030 flywheel include a pressure plate and disc?\u003c\/h5\u003e\u003cp\u003eNo. The 601030 is a flywheel only. ACT recommends pairing it with an ACT pressure plate and disc for a complete, matched clutch system.\u003c\/p\u003e\u003ch5\u003eWhat warranty comes with the ACT 601030?\u003c\/h5\u003e\u003cp\u003eACT backs the 601030 flywheel with a one-year warranty.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the ACT 601030 flywheel fit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The 601030 fits BMW's N54\/N55-powered 135i, 335i, 335i xDrive, 335is, 435i, 435i xDrive, 535i, 535i xDrive, and Z4 sDrive35i across the 2009-2016 model years. 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