MMR Performance Single Piece Billet Crank Hub Upgrade for BMW S55 & N55 - Fits F80 M3, F82/F83 M4, F87 M2 & F2x/F3x 135i/235i/335i/435i - Pinned 4-Pin Option & Capture Plate Available - Prevents Crank Hub Slip

MMR One Piece Billet Timing Hub for BMW S55 and N55 Engines

Protect your straight six by eliminating timing drift at the source. This MMR solid billet timing hub replaces the factory three-piece arrangement that is known to rotate under load, bringing reliable cam timing control for fast-road, track day and daily-driven cars. It is the proven way to stop hub movement on S55 and N55 powerplants found in F80 M3, F82 and F83 M4, F87 M2 plus F2x and F3x 135i, 235i, 335i and 435i.

We run this hardware on our own builds and on many customer cars with outstanding results. Owners report confidence at high RPM, consistent timing on tuned applications and peace of mind when pushing hard. If you are chasing a long-term remedy for timing slippage on your BMW M car or N55-powered F series, this is the part that delivers.

Why choose a solid timing hub

• Removes the multi-piece friction washer interface that can rotate under torque spikes
• Keeps valve timing locked even on calibrated and higher torque setups
• Prevents the chain drive from shifting, helping avoid valve and piston contact
• Ideal for stock power through to aggressive software calibrations

Engineered for strength

• Billet EN36 steel with 0.75 mm case hardening for exceptional surface durability
• Precision machined one piece design for consistent engagement with the crank nose and chain drive
• Optional billet aluminium Capture Plate clamps the crank bolt head to resist loosening from vibration and harmonics

Choose your specification

Two hub variants are available to suit your build.

• Unpinned one piece hub for standard to mild performance increases and straightforward installation
• Pinned 4 dowel version for higher torque cars that demand maximum security
  Part number for the pinned 4 pin model: MMR20-1004

Fitment

• BMW M3 F80 with S55
• BMW M4 F82 and F83 with S55
• BMW M2 F87 with N55
• BMW M2 Competition F87 with S55
• BMW M135i F20 and F21 with N55
• BMW M235i F22 and F23 with N55
• BMW 335i F30 and F31 with N55
• BMW 435i F32, F33 and F36 with N55

Torque setting

Crank fastener torque: 100 Nm initial torque plus 270 degrees.

Real world confidence

We have installed this MMR hub package on numerous S55 and N55 builds and the feedback has been consistently positive. Customers report stable timing on road and circuit use, smoother high RPM running and a welcome end to timing hub worries.

Professional fitting by MJ Modifications

For installation of the hub and optional Capture Plate we recommend booking in with us at MJ Modifications in Warwickshire. Request a tailored quote and availability at info@mjmodifications.co.uk.

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Order your MMR one piece hub today and safeguard the timing on your S55 or N55 for confident performance driving.