S55 4-Pin Crank hub

The S55 engine found in the F80 M3, F82/F83 M4, and F87 M2 Competition is known in the BMW performance world for potential crank hub issues, especially on modified or aggressively driven cars. A 4-pin crank hub upgrade replaces the factory crank hub system with a more secure pinned solution designed to help prevent crank hub slip and timing-related failures.

At 1010 Performance, we install a Heat treated & Zinc plated 8620 Steel 4-pin crank hub upgrade with proper timing procedure, new supporting hardware, gaskets, fluids, and related components needed for the job. This service is especially important for S55 owners who are tuned, running more boost, tracking the car, or planning to push more power. It is one of the best preventative upgrades for long-term S55 reliability.