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- Part Number: MMR20-1004
- Brand:

- EC Approved: NO
Stocked and shipped from the EU
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This MMR single-piece crank hub features a 4-pin dowel locking system that mechanically secures the hub to the crankshaft, eliminating the risk of hub slip. CNC-machined in the UK from billet EN36 steel and case-hardened for maximum strength, it delivers a major reliability upgrade over the OEM design. Supplied as a complete kit, it includes precision dowels, a new OEM crank bolt, and a dedicated installation jig to ensure accurate and safe professional fitment.
Single-piece CNC-machined crank hub
Billet EN36 steel construction
0.75 mm case-hardened for extreme durability
4-pin dowelled mechanical locking system
Prevents crank hub slip
Installation jig included (drill guide + HSS drill bit)
New OEM crank bolt included
Professional installation required
Made in the UK
2026 - This material is exclusively copyrighted and reserved

| Manufacturer | Model | Type | Version |
|---|---|---|---|
| BMW | 1 Series | E8x - 08-13 | 135i - 306 |
| BMW | 1 Series | E8x - 08-13 | 1M - 340 |
| BMW | 1 Series | F2x - 11-20 | 135i - 320 / 326 |
| BMW | 2 Series | Fxx -13-20 | 235i - 326 |
| BMW | 2 Series | Fxx -13-20 | M2 - 370 |
| BMW | 2 Series | Fxx -13-20 | M2C - 410 / 450 |
| BMW | 3 Series | E46 - 01-06 | M3 - 343 / 360 |
| BMW | 3 Series | Fxx - 13-19 | 335i -306 |
| BMW | 3 Series | Fxx - 13-19 | M3 - 431 / 450 / 460 |
| BMW | 4 Series | Fxx - 13-19 | 435i - 306 |
| BMW | 4 Series | Fxx - 13-19 | M4 - 431 / 450 / 460 |


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Reviews Over MMR 4-pinned single piece crank hub BMW 135i - 235i - 335i - M2 - M3 - M4 - M5 / N54, N55, S55, S54
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