MMR BMW S55 Crank Hub Kit (M2 Comp/M3/M4)
MMR BMW S55 Crank Hub Kit is an essential modification for the S55 engine. It's no secret that the S55 is prone to spinning it's crank hub resulting in quite a hefty repair bill. Once the crank hub spins, the engines timing is completely thrown off resulting in pistons hitting the valves and complete engine failure. Investing in preventative maintenance could make all the difference!
As a preventative measure, MMR have developed this crank hub upgrade kit to ensure the friction plates can't slip and with a new crank bolt tightened appropriately, this delivers a substantial improvement in reliability versus the OE version. It offers the most comprehensive solution on the market at one of the most compelling price points.
Careful design has also allowed MMR to develop a solution that's easy to install compared to some other products as there's no drilling or modification required to the OE crankshaft, saving you time and money.
The MMR Performance one-piece crank hub is machined from billet EN36 that's been heat-treated with a 0.75mm case hardening, making it incredibly strong and durable. Combine this product with the MMR S55 crank hub capture plate for the ultimate solution.
All in stock products ship the same day if ordered before 2pm GMT
For out of stock items we will contact you with an estimated wait time if not otherwise specified above.
We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy
All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.