MMX Crank hub & capture plate BMW F8X S55 N55
Product Description
The Ultimate Fix for S55 & N55 Crank Hub Failure – Proven Reliability
The factory three-piece crank hub used on the S55 & N55 engines (F80 M3, F82/F83 M4, F87 M2 etc.) is a well-known weak point. Under load, the OE hub’s friction plates can slip, causing the timing to jump. When this happens, piston-to-valve contact is highly likely — often resulting in catastrophic engine damage and a repair bill into the thousands.
The MMX Performance One-Piece Billet Crank Hub eliminates this risk completely. Whether your engine is stock or running increased power and torque, this is the most complete and robust crank hub solution available.
Why Upgrade?
OE Hub Failure — A Known S55/N55 Weakness
The standard BMW crank hub uses a multi-piece friction design. Under higher torque (even from factory), the friction plates can slip, resulting in:
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Timing jump
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Potential piston-to-valve contact
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Total engine failure
BMW’s only solution? Replace the entire assembly — and often deny warranty on modified vehicles.
One-Piece Billet Hub = No More Slip
MMX’s redesigned hub is a single, solid billet EN36 steel component, heat-treated and case-hardened. There are no friction plates to slip, meaning the hub and timing gear remain permanently locked together.
Key Features
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One-piece billet EN36 steel hub – case hardened (0.75mm surface)
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Eliminates slip from friction-plate design on OE hub
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Straightforward install (no drilling for dowels required on unpinned version)
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Optional Capture Plate prevents crank bolt loosening
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Engine-safe solution for stock & tuned cars
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Suitable for road, track and high-power builds
Capture Plate
The Capture Plate is bolted over the crank bolt head and physically prevents bolt loosening from vibration or harmonics.
Benefits:
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Locks the crank bolt in place – zero chance of it backing out
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Ideal for high-RPM track or drift environments
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Adds a second layer of security over the one-piece hub
Pinned vs Unpinned Version — Which Should You Choose?
MMX offers two versions of the crank hub:
| Version | Recommended For | Notes |
|---|---|---|
| Unpinned Hub (this product) | Stock to Stage 1 tuned cars | No drilling into the crank needed. |
| Pinned Hub (upgrade option) | High-power builds / drag / track cars | Requires crankshaft drilling for 4 dowel pins. |
For most customers, the unpinned version is more than sufficient.
Installation & Torque Specs
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Follows BMW OE procedure
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No special tools required (for unpinned hub)
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Crank bolt torque: 100 Nm + 270° rotation (S55/N55)
Professional installation recommended.
Compatibility
BMW S55 & N55 Engines:
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F87 M2 / M2 Competition (N55/S55)
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F80 M3
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F82 / F83 M4
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Also fits other BMW models using N55 engines
Shipping & Delivery
Dispatch Times
Most stocked items dispatch within 1–2 business days. Some products may have longer lead times due to special ordering, availability, or build times. If your order contains multiple items, they may be shipped together once all items are ready unless otherwise agreed.
UK & International Shipping
We ship worldwide. Transit times vary depending on destination and courier. Tracking details are provided once your order is dispatched.
Import Duties & International Orders
International customers are responsible for all import duties, taxes, and clearance fees. These are not included in our prices and are outside of our control. Refusal or non-payment of import charges may result in return shipping, handling fees, and customs charges being deducted from any refund.
Damaged Shipments
If your parcel arrives visibly damaged, please refuse delivery or note the damage with the courier. If damage is discovered after opening, contact us immediately with photos. Do not install damaged items, as installation voids courier claims and return eligibility.
Returns
Returns must be authorised before sending anything back. Returns must be requested within 14 days of delivery and returned within 14 days of approval, in unused/uninstalled condition and in original packaging. Some items, including special-order, built-to-order, used, installed, or modified parts, are non-returnable.
Full details are available in our Shipping Policy and Returns & Refund Policy.
Warranty & Disclaimer
Warranty
Most products include a manufacturer’s warranty covering manufacturing defects only. Warranties do not cover wear and tear, improper installation, misuse or neglect, track use, competition or racing environments, labour costs, vehicle damage, downtime, or consequential loss. Warranty outcomes are determined by the manufacturer, not Clubsport Garage. Items must be returned for inspection at the customer’s cost unless agreed otherwise.
Fitment & Installation
Many products are aftermarket components and may require professional installation or minor adjustment. Perfect OEM-level fitment cannot be guaranteed. Professional installation by an experienced workshop is strongly recommended. Installed or used items cannot be returned.
Motorsport Use Disclaimer
Some products are intended for off-road, track, or motorsport use only and may not be legal for road use, for example non-TÜV/DOT-approved parts. It is the customer’s responsibility to ensure compliance with local laws, insurance requirements, and vehicle regulations. By purchasing and installing aftermarket parts, you accept all responsibility for ensuring compatibility, legal compliance, proper installation, and any resulting wear, damage, or failure.
Product Images & Descriptions
Product photos are illustrative and may differ slightly from the item supplied. If specific details are important, please contact us before purchasing.
Full details are available in our Terms of Service and related policy pages.
