S55 Upgraded SSR M3/M4 4-Pin Keyed Crank Hub Kit

SSR performance


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ATTENTION: Although Maximum PSI has discontinued the private labeling of this product, we still offer this kit directly from the facility that designed and still currently manufactures it. It can no longer be purchased from Maximum PSI, however, we still offer this solution with express consent from the owners of Maximum PSI. This is the exact kit that was previously offered by Maximum PSI and will perform exactly the same. Maximum PSI, Mashimarho, and SSR Performance assume no liability for the use of this product. The product is for off-road / racing use only.

This kit includes all recommended components necessary in order to successfully remove and replace your stock S55 crank hub with an upgraded 2-piece Maximum PSI keyed crank hub. Professional installer discretion is highly advised in deciding if any other components need replacing during the process of replacing the crank hub.

We highly suggest that this Crank Hub Kit ONLY be installed by qualified personnel. Timing tools are required to complete this procedure. Improper installation may cause irreversible engine damage.

Allow 5-7 business days for shipping after date of crank hub purchase


  • BMW F80 M3 (2015 - 2018)
  • BMW F82 M4 (2015 - 2018)
  • BMW F82 M2 Competition (2019+)
  • The items in this kit are compiled specifically for the BMW S55 engine and, therefore will fit any other unlisted models that use a BMW S55 engine


    • Crankshaft Alignment S55 Timing Tool Kit

    Part availability is subject to manufacturers on-hand quantities. If ordered, the product may not ship till items are back in stock as per manufacturer's timelines.