18/10/2026
Some upgrades you do for power. This one you do for peace of mind. โ๏ธ
The BMW S55 engine is known for its performance potential, but also for one critical weak point: the stock crank hub.
From factory, the crank hub relies on a friction fit design to keep the timing sprocket in place on the crankshaft. Under increased torque, higher boost and repeated load, that friction can be overcome, which may lead to timing movement and in worst cases serious internal engine damage.
That is exactly why we developed the Mosselman S55 Upgrade Crank Hub.
This upgraded solution replaces the factory design with a precision engineered pinned system that mechanically locks the timing sprocket to the crankshaft. No reliance on friction alone, but a secure and stable connection designed for high performance use.
The result is simple. A much stronger foundation for your engine. Especially important for tuned S55 setups running Stage 2 or Stage 3 power levels, track use or repeated high load driving.
If you are increasing power, this is not an optional upgrade anymore. It is preventative protection that helps ensure your engine stays in time, even under extreme stress.
Because when it comes to crank hub issues, prevention is always the only correct timing.
๐ Secure your S55 before problems start
๐ www.mosselmanturbo.com
๐ง [email protected]
๐ +31 (0) 318 457832
๐ Harskamp, Gelderland
Mosselman