Product Description
The MMX Single Piece Crank Hub Upgrade is the definitive fix for the widely known crank hub issues affecting BMW S55 and N55 engines. The factory three-piece crank hub design can slip under high load, leading to incorrect timing and potentially catastrophic engine failure. This MMX solution replaces the OEM setup with a mechanically locked, single-piece hub that completely eliminates the risk of hub rotation.
Manufactured in the UK from heat-treated billet EN36 steel, the crank hub features a precision-engineered single-piece construction with four aerospace-grade dowels. These dowels physically lock the hub to the crankshaft, ensuring absolute positional stability even under extreme torque and high-RPM conditions. With a 0.75mm case-hardened surface, the hub delivers exceptional strength, wear resistance, and long-term reliability.
To ensure accurate and repeatable installation, the kit includes a comprehensive bolt-on drilling guide system. This allows precise dowel hole alignment directly on the engine, making professional installation straightforward and safe. A brand-new OEM crank bolt is included for complete peace of mind, and for those seeking maximum protection, an optional capture plate is available as an additional safeguard.
KEY FEATURES
- PART NUMBER: MMR20-1004
- Single-piece crank hub design eliminates factory slip issues
- Four aerospace-grade precision dowels provide a positive mechanical lock
- Machined from heat-treated billet EN36 steel with case hardening
- Supplied with a brand-new OEM crank bolt
- Complete installation kit including drilling jig, guide, and HSS drill bit
- Optional capture plate available for additional security
- Designed and manufactured in the United Kingdom
- Ultimate reliability upgrade for BMW S55 and N55 engines
COMPATIBILITY
- BMW 1 SERIES (F20 / F21) – M135i (N55)
- BMW 2 SERIES (F22 / F23 / F87) – M235i (N55), M2 (N55), M2 Competition (S55)
- BMW 3 SERIES (F30 / F31 / F80) – 335i (N55), M3 (S55)
- BMW 4 SERIES (F32 / F33 / F82) – 435i (N55), M4 (S55)
- MODEL YEARS: 2011 – 2021
Safeguard your engine and drive with confidence by upgrading to the MMX S55 & N55 Single Piece Crank Hub. Precision engineered for strength, reliability, and long-term peace of mind, this is a must-have upgrade for any performance-focused BMW.
The MMX Single Piece Crank Hub Upgrade is the definitive fix for the widely known crank hub issues affecting BMW S55 and N55 engines. The factory three-piece crank hub design can slip under high load, leading to incorrect timing and potentially catastrophic engine failure. This MMX solution replaces the OEM setup with a mechanically locked, single-piece hub that completely eliminates the risk of hub rotation.
Manufactured in the UK from heat-treated billet EN36 steel, the crank hub features a precision-engineered single-piece construction with four aerospace-grade dowels. These dowels physically lock the hub to the crankshaft, ensuring absolute positional stability even under extreme torque and high-RPM conditions. With a 0.75mm case-hardened surface, the hub delivers exceptional strength, wear resistance, and long-term reliability.
To ensure accurate and repeatable installation, the kit includes a comprehensive bolt-on drilling guide system. This allows precise dowel hole alignment directly on the engine, making professional installation straightforward and safe. A brand-new OEM crank bolt is included for complete peace of mind, and for those seeking maximum protection, an optional capture plate is available as an additional safeguard.
KEY FEATURES
- PART NUMBER: MMR20-1004
- Single-piece crank hub design eliminates factory slip issues
- Four aerospace-grade precision dowels provide a positive mechanical lock
- Machined from heat-treated billet EN36 steel with case hardening
- Supplied with a brand-new OEM crank bolt
- Complete installation kit including drilling jig, guide, and HSS drill bit
- Optional capture plate available for additional security
- Designed and manufactured in the United Kingdom
- Ultimate reliability upgrade for BMW S55 and N55 engines
COMPATIBILITY
- BMW 1 SERIES (F20 / F21) – M135i (N55)
- BMW 2 SERIES (F22 / F23 / F87) – M235i (N55), M2 (N55), M2 Competition (S55)
- BMW 3 SERIES (F30 / F31 / F80) – 335i (N55), M3 (S55)
- BMW 4 SERIES (F32 / F33 / F82) – 435i (N55), M4 (S55)
- MODEL YEARS: 2011 – 2021
Safeguard your engine and drive with confidence by upgrading to the MMX S55 & N55 Single Piece Crank Hub. Precision engineered for strength, reliability, and long-term peace of mind, this is a must-have upgrade for any performance-focused BMW.
MMX
par
MMX
MMX BMW S55 & N55 Single Piece Crank Hub Upgrade
- Prix habituel
- £818.99
- Prix soldé
- £818.99
- Prix habituel
-
Taxe inclu.
Frais de port calculés à la caisse.
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Returns
Return Policy
At Race Haus, we aim to make returns simple. If you’ve received a damaged, incorrect, or faulty item, or simply changed your mind, contact us within 48 hours of delivery. We have a 14-day return policy; items must be unused, in original packaging, with proof of purchase. Returns must be authorised by contacting info@racehaus.co.uk or calling 0191 6941237. Custom, personalised, or sale items are non-returnable. Return postage is the customer’s responsibility unless the item is faulty. For full details, including exceptions and refund processing, please visit our refund policy. https://racehaus.co.uk/policies/refund-policy
14-Day Return Policy
Return Policy
At Race Haus, we aim to make returns simple. If you’ve received a damaged, incorrect, or faulty item, or simply changed your mind, contact us within 48 hours of delivery. We have a 14-day return policy; items must be unused, in original packaging, with proof of purchase. Returns must be authorised by contacting info@racehaus.co.uk or calling 0191 6941237. Custom, personalised, or sale items are non-returnable. Return postage is the customer’s responsibility unless the item is faulty. For full details, including exceptions and refund processing, please visit our refund policy. https://racehaus.co.uk/policies/refund-policy
Shipping
Shipping Policy
At Race Haus, we aim to ship orders quickly and efficiently. UK deliveries usually take 3–7 working days, with Next Day Delivery available for orders placed before 2PM (Monday–Friday). International shipping typically takes 7–10 working days, with costs calculated at checkout; additional customs fees may apply. Due to Brexit, some EU customers may incur import duties—VAT is removed at checkout, but Race Haus is not liable for any customs charges. Some products are made to order or sourced from overseas, and lead times may vary. We advise checking stock availability or contacting us before urgent purchases. Delivery times are estimates, and Race Haus cannot be held responsible for courier delays. Full details: https://racehaus.co.uk/pages/shipping-polices
Worldwide shipping
Shipping Policy
At Race Haus, we aim to ship orders quickly and efficiently. UK deliveries usually take 3–7 working days, with Next Day Delivery available for orders placed before 2PM (Monday–Friday). International shipping typically takes 7–10 working days, with costs calculated at checkout; additional customs fees may apply. Due to Brexit, some EU customers may incur import duties—VAT is removed at checkout, but Race Haus is not liable for any customs charges. Some products are made to order or sourced from overseas, and lead times may vary. We advise checking stock availability or contacting us before urgent purchases. Delivery times are estimates, and Race Haus cannot be held responsible for courier delays. Full details: https://racehaus.co.uk/pages/shipping-polices
Rated
4.6
Availabilty
Please note that this timeframe may be subject to supplier availability. We take pride in being transparent about lead times, and if a product has a longer lead time, we will personally contact you to provide updates on the shipping process
