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- Part Number: MMR20-1004
- Brand:

- EC Approved: NO
Stocked and shipped from the EU
E.U. BENEFITS
All products are shipped from the European Union, thus if shipping destination is within the E.U. no extra charges (such as tax import) will be applied.
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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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