RK BMW S55 4-Pin Billet 4130 Chromoly Pinned Crank Hub Upgrade Kit - F80 F82 F83 F87 (M2 Competition, M3, M4) - Anti-Spin S55 Crank Hub Fix

RK S55 Four-Pin Crankshaft Hub Solution for F8x M2C, M3, M4

Eliminate timing slip worries on your S55. This RK pinned crankshaft hub locks the hub to the crank for rock-solid cam timing under hard launches, high-boost mapping and relentless track sessions. Precision made from heat treated 4130 chromoly billet and engineered for an exact OE interface, it is the dependable no-slip timing drive upgrade serious F8x owners choose.

• Four-pin locking design for positive crank-to-hub location under extreme torque
• Billet 4130 chromoly steel for outstanding strength and fatigue resistance
• OEM geometry laser scanned then CNC machined for precise, repeatable fitment
• Direct fit for S55 engines in F80, F82, F83 and F87 platforms
• Machined in-house on HAAS 4-axis equipment for tight tolerances and perfect alignment
• Professional drill bits included to complete the pinning process

Real-world proven on high-power S55 builds. We have installed this kit on customer cars and our own vehicles with excellent feedback for timing stability and long-term reliability. It has endured repeated Dragy passes and VMAX events without any timing drift. In short, the clutch will give up before this hub does.

Why choose a pinned hub on the S55

The factory friction-based hub can rotate under shock loads, causing timing misalignment and expensive engine repairs. This pinned solution mechanically locates the hub to the crankshaft to prevent rotation, protecting your investment on fast-road cars, track day builds and drag setups. Ideal for tuned M2 Competition, F80 M3 and F82 or F83 M4 owners seeking a permanent timing drive fix with peace of mind.

Vehicle compatibility

Fits all BMW S55 models in the F8x range:

• F87 LCI M2 Competition
• F80 M3 Saloon including LCI, Competition and CS
• F82 M4 Coupe including LCI, CS and GTS
• F83 M4 Convertible including LCI

What you need to know

• New OEM BMW crank bolt is required and not included
• Professional installation strongly recommended
• Drill bits included in the kit

Fitting service

For a hassle-free install, book your car with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote and availability.

Part number

RKS55CRANKHUB

Buy with confidence

Supplied by enthusiasts, fitted by enthusiasts. We have used this RK hub on our own projects and customer cars with superb results. If you are running a remap, hybrid turbos, sticky tyres or simply want bulletproof timing security, this is the upgrade that keeps your S55 safe and consistent.

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