MMX BMW S55 & N55 Single Piece Crank Hub Upgrade
Description
The MMX Single Piece Crank Hub Upgrade is the ultimate solution to the well-documented crank hub failures affecting BMW’s S55 and N55 engines. Designed with a 4-pin dowelled single-piece design, this upgrade eliminates the risk of the factory three-piece hub slipping – a known cause of catastrophic engine failure in M2, M3, M4, and N55-powered models.
CNC-machined in the UK from heat-treated billet EN36 steel with 0.75mm case hardening, the hub offers exceptional strength and durability. Four aerospace-grade precision dowels mechanically lock the hub to the crankshaft, preventing any possibility of movement. The kit also includes a brand new OE crank bolt for complete security.
To simplify installation, the MMX kit comes complete with a bolt-on drilling guide jig, location bolt, and HSS rolled drill bit – ensuring professional fitment is accurate, safe, and straightforward. For those seeking the ultimate level of security, the hub is also available with an optional capture plate.
Key Features:
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Part Number: MMR20-1004
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Single-piece design – eliminates OE crank hub slip issues
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4 aerospace-grade precision dowels for a secure mechanical lock
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Machined from heat-treated billet EN36 steel with case hardening
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Supplied with a new OE crank bolt
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Includes full installation jig, drilling guide, and HSS drill bit
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Optional capture plate for additional protection
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Designed and manufactured in the UK
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The ultimate reliability upgrade for BMW S55 and N55 engines
Compatibility:
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BMW 1 Series (F20/F21) – M135i (N55)
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BMW 2 Series (F22/F23, F87) – M235i, OG M2 (N55), M2 Competition (S55)
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BMW 3 Series (F30/F31, F80) – 335i (N55), M3 (S55)
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BMW 4 Series (F32/F33, F82) – 435i (N55), M4 (S55)
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Model Years: 2011–2021
Protect your BMW from crank hub failure with the MMX S55 & N55 Single Piece Crank Hub Upgrade – precision-engineered for strength, durability, and complete peace of mind.
Will it fit my car?
We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.
Shipping
All orders made through MOD Central will be passed immediately to the supplier (R44 Performance) that has ships the item. You will get an email from them on the point of sale about processing and dispatch time.
Shipping Costs:
The cost of shipping will be calculated at checkout based on the destination, weight of the product and which vendor/vendors you are buying from.
Shipping Providers:
All our vendors work with trusted shipping partners to ensure your products are delivered safely. However, we are not responsible for any shipping delays, damages, or losses.
International Shipping:
Many of our vendors offer international shipping, but please be aware that additional customs fees or import taxes may apply. These charges are the responsibility of the buyer.
Tracking Information:
Once your order has been dispatched, you will receive a confirmation email with tracking details from the vendor your product was purchased from. If you have not received your tracking information, please contact the vendor with your order number.
Returns/Warranty
Eligibility:
All return eligibility will be specific to the vendor.
Return & Refund Process:
To initiate a return, please contact the vendor you purchased the product from with your order number and reason for return. Their team will provide further instructions.