Engine security and reliability are everything when you’re pushing the limits of BMW’s S55 and N55 engines - and the MMX Performance 4-Pinned Single-Piece Crank Hub Upgrade delivers the ultimate peace of mind. Available now through Eurowerke Sydney, this precision-engineered solution addresses one of the most common and costly failure points in high-performance BMW engines.
The standard three-piece OEM crank hub is known to allow rotational slip under load, which can cause the timing to shift and, in severe cases, lead to piston-to-valve contact and major engine damage. The MMX 4-Pinned Single-Piece Crank Hub completely eliminates this weakness. Machined in the UK from billet EN36 steel, the hub features four aerospace-grade dowels that mechanically lock it to the end of the crankshaft, ensuring there is no possibility of movement. A brand-new OE crank bolt is supplied with every kit, alongside a full professional installation jig that includes a bolt-on drilling guide, locating bolt, and precision drill bit - making this a true workshop-ready solution rather than a DIY job.
For most standard or Stage 1-tuned BMW S55 and N55 engines, MMX’s unpinned Single-Piece Crank Hub provides ample strength and straightforward installation. But for owners running high-power or high-torque builds - such as tuned M2 Competition, M3, M4, M135i, M235i, 335i and 435i models - this 4-Pinned version is the definitive choice for long-term reliability. Combined with the optional MMX Capture Plate, which prevents crank-bolt movement entirely, this upgrade delivers complete engine-security confidence under any load or RPM.
At Eurowerke, we’ve seen first-hand the damage caused by crank-hub slip - and we recommend the MMX Performance 4-Pinned Crank Hub as essential protection for any serious S55 or N55 build. Don’t run big power without it.
BMW Service Sydney
From BMW logbook servicing to advanced diagnostics with ISTA software, Eurowerke is Sydney’s home for BMW maintenance, repairs, and tuning. With deep experience across everything from 3 Series to M models, your BMW is in trusted hands.
Looking for trusted European car service in Sydney? At Eurowerke Castle Hill, we specialise in BMW, Audi, Mercedes-Benz, Volkswagen, and Porsche. Our independent workshop offers dealer-level diagnostics, logbook servicing, and performance upgrades - trusted by enthusiasts across Sydney’s Hills District for more than 15 years.
