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MMR 4-Pinned crank hub | BMW S55 | N55

Engine failures caused by the standard three-piece crank hub on the S55 and N55 engine are well known, but fully addressed with the MMR Performance 4-pinned single-piece crank hub. The OE friction plate is known to slip rotationally, causing timing to alter enough for piston-to-valve contact. Our 4-pin version is the ultimate solution for high horsepower engines.

* Single-piece design
* X4 aerospace precision machined dowels
* Machined from heat-treated billet EN36 steel
* Available to purchase with capture plate
* Complete kit including drilling jig and drill bit
* The ultimate solution to preventing crank hub failure

BMW M3 F80
Onderdeelnummer: MMR20-1004
990,98 € 990,98 € (Inclusief btw)

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Product specificaties
Merk: MMX

MMX Performance


British Engineering, BMW and MINI Specialists

MMX Performance is a UK-based manufacturer dedicated exclusively to performance modifications for BMW and MINI platforms. Formerly known as MMR Performance, the brand has evolved with a sharpened focus on precision engineering, developing a range of upgrades that enhance power, handling, and aesthetics across the full BMW and MINI model range. Every product is designed, tested, and manufactured entirely in-house in the UK, giving MMX complete control over quality, tolerances, and lead times at every stage of the process.

From Concept to Production, All Under One Roof

What sets MMX apart is the depth of their in-house capability. Using advanced 3D scanning and CAD software, the team designs every component from scratch before bringing prototypes to life with state-of-the-art 3D printing, all without outsourcing a single step. This fully integrated process allows for rapid iteration, exceptional precision, and a level of quality control that off-the-shelf or outsourced manufacturing simply cannot match. No shortcuts, no compromise, just thorough British engineering applied to every part before it reaches the customer.

Pushed to the Limit Before It Reaches Yours

Every MMX product is subjected to rigorous in-house testing before it enters production. This commitment to validation, not just design, ensures that what arrives fits perfectly, performs as intended, and holds up under real-world and performance driving conditions. For BMW and MINI owners who want modifications developed with genuine engineering depth rather than generic fitments, MMX Performance represents a specialist choice backed by a clear and uncompromising development process.