Protect your BMW’s timing with the MMX 4-pin one-piece crank hub. The factory multi-piece friction hub on S55 and N55 engines can rotate under shock loads, which may cause cam timing to drift. This keyed and pinned conversion creates a positive mechanical drive between the crankshaft and timing gear to help prevent timing slip during hard launches, rapid shifts and increased torque. For extra security, an optional Capture Plate is available to keep the crank bolt firmly in place.
- Four-pin keyed and pinned design for positive location and drive
- Single-piece replacement for the OE friction-based hub that can slip under load
- Helps keep cam timing stable and reduces the risk of costly top-end issues
- Great preventative upgrade for remapped cars, hybrid turbos, fast road, drag and track use
- Optional Capture Plate available for added crank bolt security
- Engine compatibility: BMW S55 and N55 platforms including M2 Competition, M3, M4 and selected 35i models
Nforcd knows this MMX crank hub upgrade well and it continues to be a popular reliability modification with our BMW customers looking for a keyed hub conversion or 4-pin pinned hub solution. Ideal as an aftermarket replacement for owners who want confidence to push on without timing slip concerns.
Professional installation is strongly recommended. Fitting is available through Nforcd in Warwickshire. Request a quote at Sales@nforcd.com.
Common search terms include BMW S55 crank hub fix, N55 35i crank hub upgrade, keyed crank hub conversion, pinned crank hub kit, 4 pin crankshaft hub, timing slip solution, crank sprocket upgrade and crank bolt capture plate for F80 F82 F83 F87 M2 Competition, M3 and M4.