Keyed Crank Hub Fix Kit- M3 / M4 / M2C S55 (DESIGNED BY MAXIMUM PSI)

SSR Performance

  • $1,199.00
    Unit price per 
  • Save $100

ATTENTION: Although Maximum PSI has discontinued the private labeling of this product, we still offer this kit direct 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 being offered by Maximum PSI and will perform exactly the same. Maximum PSI and SSR Performance assume no liability on the use of this product. Product is for off-road / racing use only.

There are thousands of reported cases on the internet of "spun crank hubs" on stock and modified cars with the S55 engine. The keyed crank hub upgrade is a replacement of your stock crank hub unit with a unit that has two “keys” or “pins” for which 2 holes are drilled into the S55 crankshaft so that upon installation of the crankshaft bolt the new keyed crank hub can be locked into place permanently without a chance of relative rotation to the crankshaft. This allows further insurance against the chance of the crank hub “slipping” or “spinning” and un-syncing the relative angles between the crankshaft and camshafts (this can mean engine failure which will cost upwards of $20,000 to replace or at the very least leave you stranded and un-driveable until the crank hub is replaced and engine is retimed). This SCH failure has been seen on both modified and stock S55 engines. If you are modifying your car, tracking your car, or even driving spiritedly, then upgrading your crank hub is highly recommended.

Watch our YouTube video above for a full demonstration!


  • Two Piece Keyed Crank Hub
  • OEM Crank Bolt
  • Specialty Drill Bit
  • Drill Fixture Tool
  • Drill Fixture Bolt

We suggest that this Crank Hub Kit ONLY be installed by a highly qualified technician. BMW specialty tools are required in order to complete this procedure.

Improper installation may cause irreversible engine damage.


  • BMW F80 M3 (2015 - 2018)
  • BMW F82 M4 (2015 - 2018)
  • BMW F87 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

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