MMR S55 One-Piece Crankshaft Hub Kit for BMW F80 M3, F82/F83 M4 & F87 M2 Competition - Crankshaft/Timing Hub Upgrade & Slip Fix - EN36 Billet Steel - Optional Crank Bolt Capture Plate - No-Drill Installation

MMR S55 Single Piece Crankshaft Hub Conversion for BMW F80 M3, F82 F83 M4, F87 M2 Competition with Optional Bolt Capture Plate

Protect your S55 engine from timing drift and hub slip with the proven MMR one piece crankshaft hub conversion. Designed for the BMW F80 M3, F82 and F83 M4, and F87 M2 Competition, this precision engineered solution replaces the factory multi piece arrangement that can allow movement under load. Ideal for standard and tuned cars, fast road and track day use, and anyone who wants confidence from their M power 3.0 twin turbo.

Why this upgrade matters

The original three piece arrangement can allow the friction interfaces to move, which risks cam timing misalignment and costly engine damage. The MMR single piece hub removes the slip points, delivering a robust, long term fix for the S55 timing drive. Add the optional billet aluminium capture plate to positively retain the crank bolt for ultimate security.

Engineered strength you can trust

• One piece design eliminates friction plate movement for dependable timing stability.
• Machined from EN36 billet steel, case hardened to approximately 0.75 mm for exceptional surface hardness and core toughness.
• Fresh crank bolt, correctly torqued, dramatically improves reliability over the factory arrangement.
• Optional billet aluminium capture plate locks the crank bolt head in place to prevent loosening.
• No drilling or modification of the original crankshaft required, reducing installation time and complexity.

Real world results

We have installed this conversion in house and seen superb results. Our customers consistently report peace of mind, repeatable performance and trouble free running on both stock and higher power S55 builds.

Benefits at a glance

• Prevents timing drift and protects against valve to piston contact.
• Suitable for daily driving, spirited B road use and circuit work.
• Ideal foundation for further performance upgrades and remaps.
• Clear, straightforward installation with no crank drilling.

Choose your kit

• MMR20-1003FK - Single Piece Crankshaft Hub Kit with Capture Plate.
• MMR20-1001 - Single Piece Crankshaft Hub only.

Vehicle compatibility

• BMW F80 M3 S55 engine 2012 to 2018.
• BMW F82 and F83 M4 S55 engine 2013 to 2018.
• BMW F87 LCI M2 Competition S55 engine 2016 to 2018.

Fitting and support

Professional installation is recommended. Book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Before dispatch we run a compatibility check using your UK registration or the last 7 digits of your VIN. Add your vehicle details at checkout and our team will confirm fitment.

Manufactured by

MMR

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