MMR Performance BMW N55 S55 CRANK HUB SINGLE PIECE UPGRADE
669.99€
In Stock - Available from Supplier
Dispatch between 14 September - 21 September.
The MMR Performance BMW N55 S55 Crank Hub Single Piece Upgrade is an essential solution for preventing the notorious crank hub slippage issue found in N55 and S55 engines. Precision-machined from high-strength billet material, this single-piece design eliminates the risk of the crank bolt loosening under high RPM and tuned applications. Perfect for track or high-power builds, this upgrade ensures long-term reliability and peace of mind for your BMW M2, M3, M4, and other N55-powered models.
Issues relating to the standard three-piece crank hub on the N55 & S55 engine are (unfortunately) widely known, but these are fully addressed with the installation of the MMR Performance one-piece billet Crank Hub, together with the option to add our Capture Plate for ultimate security.
The OE crank hub unit’s friction plate are known to slip, causing the timing to alter enough that piston-to-valve contact can occur and, if not totally standard and within the warranty period, leaves owners with a very expensive repair bill!
We have developed this Single-Piece N55 S55 Crank Hub together with our optional Capture Plate to ensure owners have complete peace of mind, whether on an untuned factory car or equally for those that wish to increase the power and torque output without ever having to worry again; MMR have engineered the most comprehensive solution on the market and at one of the most compelling price points.
OE Multi-Piece Crank Hub (L) compared to MMR Single Piece Crank Hub (R)
The crank hub is machined from billet EN36 steel that’s been heat-treated with a 0.75mm case hardening, making it incredibly strong and durable. The one-piece design ensures the friction plates can no longer slip and with a new crank bolt tightened appropriately, this alone delivers the transformational improvement in reliability versus the OE version.
Single-Piece Crank Hub (L) with Capture Plate (R)
As MMR Performance offers two versions of the Single-Piece Crank Hub, which is best for you, pinned or unpinned? For most standard to Stage 1 tuned N55 & S55 engines, this unpinned MMR Single-Piece Crank Hub is more than sufficient. Installation is more straightforward as the end of the crankshaft does not need to be precision drilled to mount the four locating dowels. However, for high power/torque engines tuned beyond this level, we recommend the upgraded pinned version of the Crank Hub that incorporates the 4-pin dowel drive mounting for the ultimate engine security. The 4-pin version is part number MMR20-1004.
Finally. alongside the Crank Hub, the optional MMR Capture Plate ensures that owners have complete peace of mind.
This Capture Plate removes the possibility for the crank bolt to be able to loosen with the engine’s vibrations or harmonics. The Capture Plate is an additional billet aluminium hat that securely bolts over the entire head of the crank bolt, making it literally impossible for the bolt to come undone. Please select from the product option below at point of ordering to include a Capture Plate with your order.
N55 and S55 bolt torque – 100Nm initial torque plus 270 degrees.
ADDITIONAL INFORMATION:
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PREPREG is a common term for a reinforcing fabric such carbon which has been pre-impregnated with a resin system. This resin system (typically epoxy) already includes the proper curing agent. As a result, the prepreg is ready to be laid into the mold without the addition of any more resin. In order for the laminate to cure, an autoclave production process is used, a combination of high pressure and heat.
- Maximum strength and performance characterictics. In a hand layup production process, it is difficult to achieve 50% fabric and 50% resin content. Typical hand laminates, even when vacuum bagged, end up with a significant amount of excess resin. Excess resin increases brittleness and reduces overall strength properties. On the other hand, most prepregs contain around 35% resin. This is ideal for maximum cured properties and generally impossible to achieve in normal hand lamination.
- Uniformity and repeatability. The prepreg is of uniform thickness and each part coming out of the mold may theoretically be the same. Vacuum bagging technology may have some errors in processing, but prepreg ensures production consistency.
- Reduce curing time. After the thermal curing cycle, no need to wait for the standard 48 hours can be fully cured.
- Aesthetics. Although prepreg processing still requires mold preparation and demoulding, prepreg processing eliminates air bubbles, makes it easier to obtain a smooth, glossy surface as well as eliminates any seaming lines.
We offer free tracked shipping on all orders within mainland EU. Orders to remote areas such as Malta, Cyprus, and Iceland may incur a surcharge. Worldwide shipping is also available—please contact us for a quote.
Most orders dispatch within one business day (Monday to Friday). EU delivery takes 3–5 working days from dispatch, and tracking details will be provided via email once your order has shipped.
Please note that import taxes may apply outside the EU, and these are the responsibility of the buyer. Some items may ship directly from our suppliers and may have varying delivery times. If an item is out of stock, we will contact you to discuss the available options.
RETURNS
Changed your mind? You can return unused, uninstalled items in original packaging within 30 days of delivery. Return shipping is the customer’s responsibility unless the item is faulty.
Custom, used, or built-to-order items are non-returnable.
Once we receive and inspect your return, refunds are typically processed within 10 business days.
If your item is damaged or incorrect, contact us within 48 hours with photos and order details.
WARRANTY
All VA and VA Motorsports products come with a 1-year limited warranty covering manufacturing defects and fitment issues. For third-party items, warranty terms vary by brand—please check the product listing or contact us for details.
This warranty does not cover wear and tear, incorrect installation, cosmetic damage, labor, or third-party costs.
To start a claim, email us with your order number, issue description, and photos. If the claim is approved, we’ll offer a replacement, store credit, or a refund.
FREQUENTLY ASKED QUESTIONS (Faq)
Do you ship worldwide?
Yes, we do ship worldwide. However, we recommend contacting us before placing your order, as the price only covers the product and does not include shipping costs
How can I determine if a part will fit my vehicle?
Each product listing includes detailed compatibility information. Please review it carefully to ensure the part fits your specific vehicle model and year. If you’re unsure, feel free to contact us with your vehicle details, and we’ll be happy to assist you.
Do you offer installation service?
Yes, we do provide this service in our workshop. Our skilled technicians can professionally install your body styling and performance parts to ensure a perfect fit and optimal performance. Please contact us to schedule an appointment or for more information.
Do you provide free shipping?
Yes, customers within mainland EU can enjoy free shipping on all orders. However, in rare cases, customers from non-EU or remote areas may be contacted about an additional shipping fee. For further questions, feel free to contact us.
How long does shipping take?
Shipping times vary based on your location and the product ordered.
Take note, that in-stock products will be shipped the next working day. Otherwise, your order will be dispatched as stated on its product information.
For customers within the EU, delivery typically takes 3-5 working days from the dispatch date.
For international customers, orders are generally delivered within 5-10 working days from the dispatch date.
What is your return policy?
We accept returns on unused and uninstalled items within 14 days of purchase. The product must be in its original packaging and condition. Shipping fees are non-refundable, and return shipping costs are the buyer's responsibility.
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