Spun Crank Hubs (SCH) are becoming an issue on S55s, failures have been reported on both modified and stock platforms. If you are modding, seeing regular track use or planning to keep your M2C/M3/M4 after your warranty expires, this solution (or any other that bonds the hub to the crank) is highly recommended. The VTT Spline Lock kit is a great way to affix the hub to the crank, rather than depending solely on the tension from the hub bolt to hold the hub/gears securely, which has proven to be unreliable in some cases.
The VTT S55 crank bolt capture. slips over the head of the crank bolt fully encapsulating it, and locks it to the crank hub, meaning it cannot back out no matter what.
For those who are local to us and are looking to keep their vehicles for extended use, our Crank Hub Service is a must. Don't let your BMW engine become a casualty.
