MMX Four-Pin One-Piece Crank Hub – BMW N55 & S55

Product Description

The MMX four-pin hub replaces the original multi-piece crank hub with a one-piece steel assembly and four locating dowels. It is designed to reduce the risk of rotational slip between the original hub parts; a separate capture-plate option secures the crank-bolt head.

Further information below.

Key Features

Heat-treated EN36 billet steel.
Four precision dowels.
Drilling jig and drill bit included.
Optional MMR20-1002 capture plate.
MMX’s fitting note specifies an initial crank-bolt torque of 100Nm followed by 270°; installation must follow the complete current procedure.

Vehicle Compatibility

BMW N55 and S55 applications listed by MMX: M135i, M235i, 335i, 435i, original M2, M2 Competition, M3 and M4, 2011–2021.
Confirm engine and installation requirements.

What's Included

MMX four-pin one-piece crank hub kit.
Four dowels, drilling jig and drill bit.
Capture plate only with the MMR20-1004FK option.

FAQs

Which option includes the capture plate?

MMR20-1004FK includes it; MMR20-1004 does not.

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.