BMW S55 and N55 Crank Hub Upgrade – MMR Performance Single Piece Billet Hub
Stop S55 and N55 crank hub slip before it happens. The MMR Performance one-piece billet crank hub is the proven S55 crank hub upgrade and N55 crank hub fix for BMW owners who want reliability and peace of mind on the road and track. Replace the problematic OEM three-piece crank hub assembly and eliminate timing slip that can lead to piston-to-valve contact and catastrophic engine damage. This is the go-to BMW S55 crank hub solution and BMW N55 crank hub upgrade for F80 M3, F82 F83 M4, F87 M2 and N55-powered F2x and F3x models.
We run this MMR one-piece crank hub on our own builds and our customers’ cars, and the feedback has been consistently excellent. If you are searching for BMW S55 crank hub fix, BMW N55 crank hub replacement, F80 M3 crank hub upgrade or F82 M4 crank hub solution, this is the bulletproof answer.
Why upgrade the S55 and N55 crank hub
The factory BMW three-piece crank hub relies on friction plates that can slip under load, causing timing shift. Even on standard cars, timing movement can trigger severe engine issues. On tuned vehicles with increased torque, the risk increases further. The MMR Performance single piece crank hub removes the multi-piece friction interface entirely, locking timing and delivering dependable reliability for both stock and tuned engines.
Engineered for strength and long-term reliability
- One-piece design eliminates the OEM multi-piece friction plate interface and prevents timing slip
- Billet EN36 steel construction with 0.75 mm case hardening for exceptional strength and durability
- Designed for BMW S55 and N55 engines – ideal for daily road use, spirited driving and track days
- Optional MMR Capture Plate further safeguards the crank bolt from loosening due to vibration and harmonics
Pinned or unpinned – which version is right for you
MMR Performance offer two versions of the single piece crank hub. For standard to Stage 1 tuned S55 and N55 engines, the unpinned single piece hub is typically the right choice and keeps installation straightforward. For higher power or higher torque builds beyond this level, choose the pinned 4-pin dowel version for ultimate security.
Part number for the pinned 4-pin version: MMR20-1004.
Optional MMR Capture Plate
Add the billet aluminium Capture Plate to lock over the crank bolt head and remove the possibility of the bolt loosening. For maximum peace of mind on your BMW S55 or N55, we strongly recommend pairing the single piece crank hub with the Capture Plate. Select the Capture Plate option when ordering.
Torque specification
S55 and N55 crank bolt torque: 100 Nm initial torque plus 270 degrees.
Vehicle compatibility – BMW S55 and N55 models
- BMW M2 F87 2015–2018 – N55 crank hub upgrade and fix
- BMW M2 Competition F87 2018–2021 – S55 crank hub upgrade and solution
- BMW M3 F80 2014–2019 – S55 crank hub replacement and reliability upgrade
- BMW M4 F82 F83 2014–2020 – S55 crank hub fix and upgrade
- BMW M135i F2x 2011–2019 – N55 crank hub solution
- BMW M235i F2x 2013–2020 – N55 crank hub upgrade
- BMW 335i F3x 2011–2019 – N55 crank hub replacement
- BMW 435i F3x 2013–2020 – N55 crank hub fix
Key search terms
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Professional fitting available
We recommend professional installation. Nforcd offer fitting at our Warwickshire workshop. For a tailored quote and availability, contact Sales@nforcd.com.
Further reading
Learn more about S55 and N55 crank hub slip and why this upgrade matters: Read the MMR Performance crank hub article.
Choose the MMR Performance Single Piece Crank Hub to protect your BMW S55 or N55 engine, lock timing and drive with confidence. Order today from Nforcd.