EAS Crank Hub Service - BMW F8X M2C/M3/M4 (S55)

We are happy to offer the only complete S55 crank hub solution that does NOT require the crank to be drilled for pins. VTT uses their proprietary "SplineLock" technology on their SplineLock Crank Hub Solutions that uses high tolerance machined splines which press into the crank, and positively lock the hub to the crank to prevent slippage. The splines are machined in such a way that rotational forces drive the hub, and splines deeper into the crank meaning when the hub encounters a situation that would normally slip a stock hub the splined hub is driven into the crank to keep it in place (much like a splined extractor). VTT has spent many months testing, and retesting this design, utilizing well over 10 different samples to come to their final production version. During testing, VTT's final hub managed to break their testing rig before slipping. These have been bench tested, and real-world tested on the VTT N54 race car spinning 8K RPM, and making well over 900whp. This technology means VTT's hub installs the same as a stock hub, no drilling of the crank, which means less labor is involved and is reversible is ever wanting to be uninstalled leaving no holes in the crank.

VTT SplineLock Crank hubs are CNC manufactured from Hardened 17-4SS for the ultimate in durability, and toughness. The VTT "Spline Lock" Crank hub is a very involved and complex installation, which will require a good portion of the S55 being torn down to access the crank hub. Unfortunately, this is not an 8 hour job as previously claimed. However, labor is much less than keyway-based solutions.

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.