MMR Performance | 4-pinned single piece crank hub | BMW N55 & S55

At PERON Automotive, we've seen firsthand the damage that crank hub failure can cause on S55 and N55-powered BMWs. That’s why we trust and supply the MMR Performance 4-Pin Single-Piece Crank Hub—the most robust and effective solution on the market for eliminating the well-known issues with the OE three-piece design.

The standard OEM crank hub uses a friction-based interface between components, which is highly susceptible to rotational slip—especially under high-revving or high-horsepower conditions. This can result in engine timing shifting just enough to cause catastrophic piston-to-valve contact, often leading to complete engine failure and costly repairs.

MMR’s 4-pin single-piece design locks the crank gear in place, eliminating the possibility of rotational slip. For maximum peace of mind, the kit is also compatible with the MMR Capture Plate, which physically locks the crank bolt in position to prevent it from backing out due to vibrations or harmonics.

Key Features:

• 4-pin locking system eliminates crank hub slip entirely

• One-piece billet construction for unmatched strength and reliability

• Designed for high-performance & track-driven S55 / N55 engines

• Prevents catastrophic timing shift and engine failure

• Compatible with MMR Capture Plate for added security

• A must-have for high-power builds and peace of mind

Protect your investment before it’s too late. This is the ultimate crank hub solution, trusted by performance specialists and track-focused enthusiasts across the world—and by us at PERON.