ATTENTION: Although Maximum PSI has discontinued the private labeling of this product, we still offer an updated style of 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 an updated keyed style solution 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 four “keys” or “pins” for which 4 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! Please note, YouTube video displays 2 pin hub for reference.

Welcome the new and improved 4 pin design! As can be seen in the photo above, the latest revision of the crank hub has been upgraded to 4 pins as opposed to the previous design which had 2. The new design is meant only to further decrease the chance of failure and not by any means was it changed due to any failures.

As it stands there is still a 100% success rate of the previous 2 piece 2 pin crank hub since we took over on the distribution of them, however that doesn't mean there wasn't room for improvement. The engineering / machining facility that is in charge of the manufacturing of this product was given the opportunity to improve on the previous design and did so based on their extensive knowledge of materials science and machining.

As mentioned above, based on the physical characteristics of this system, this new 4 pin design will only further guarantee the integrity of the product and ultimately offer our customers an even greater peace of mind!


  • 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.

Local Southern California customers please contact us today to schedule your appointment (800) 438-2808 (all in house installations come with a 1 year / 10,000 mile warranty).


  • BMW F80 M3 (2015 +)
  • BMW F82 M4 (2015 +)
  • 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

    SUPPLEMENTAL KIT INSTRUCTIONS (To use as a guideline)

    Despite updated design, the general install procedure remains unchanged other than drilling for pins.

    Part availability is subject to manufacturers on hand quantities. If ordered, the product may not ship till items are back in stock as per manufacturers timelines. All sales are final, no returns on this product. Please allow 5 - 7 days for shipping.



    Items listed with an ETA posted are subject to our PREORDER POLICY. Pre order sales will be subject to a 15% cancellation fee in the event the customer no longer wants to wait for the item.

    Items listed on sale and on pre order are not subject to cancellation. ALL SALES FINAL. 


    Rush Customs will only handle returns for the direct purchaser. If the purchase was made from a retailer other than, please contact the place of purchase for further assistance.

    You must open and inspect items within 48hrs to confirm no damage and or correct product in order to qualify for a refund or exchange. 

    Returns on ‘new’ merchandise for exchange or refund will be allowed within 30 days from the date of shipment. ‘New’ merchandise cannot be used or show signs of damage from installation or mounting. If you install or modify parts ordered in any way, you automatically waive your right to returns, refunds or exchanges. Exchange shipping costs is the responsibility of the customer.

    All returns must be accompanied with a ‘return merchandise authorization’ (RMA). To receive an RMA, you must contact Rush Customs at When requesting an RMA, please provide the following details: Name, Order Number, Date of Purchase, and Phone Number. Returns will not be processed without an RMA. Returns must also be received within 14 days from the issuance of the RMA. A RMA does not guarantee a refund or replacement.

    All returns will be inspected upon return to Rush Customs for return eligibility. Returns must be shipped prepaid by the customers. Please maintain all shipping and tracking information until your return is processed since Rush Customs is not responsible for items lost in shipment. Shipping charges are not refundable. Please include a copy of your original invoice and contact information with all returns.

    Eligible returns will be exchanged or refunded less a 20% restocking fee. Refunds will be issued by check or to the credit card used for the original purchase.

    Purchases may be cancelled for a full refund before the order ships. Please contact Rush Customs immediately at to stop the processing of an order. Once cancellation is confirmed, a credit will be issued.

    Orders already shipped from Rush Customs facility or drop-shipped vendor's place of business cannot be cancelled and will fall under the Returns for Refund or Exchange guidelines.

    Special order or customized items cannot be cancelled, returned or exchanged.

    It is the responsibility of the customer/installer to verify the proper size and application of all parts before installation.

    We will not be responsible for packages marked as delivered. It is the customers responsibility to file a lost or stolen package claim with the shipping company used for shipping. 



    You will be responsible for paying any customs or duty fees related to your shipment. Rush Customs will not be held liable for items that have been refused delivery due to customs fees and duties. Please email us is you have any questions or concerns. 



    We now offer price matching for major brands.

    Price Match Guarantee

    What qualifies?

    Your product may be eligible for price matching if it is:

    Identical to the competitor's product.

    The product must be a matching brand, model number and color to qualify.

    Immediately available at a qualifying online retailer, or a local competitor.

    Only applies to advertised listed price from large websites. Does not include private message or private email deals.

    EXCLUDED WEBSITES: We will not price match amazon, eBay, alibaba,begood,aliexpress, or any direct to China websites. 

    Exclusions apply including, but not limited to, items sold by Marketplace vendors, competitors’ service prices, special daily or hourly sales, and items for sale the Sunday before Thanksgiving Day through the Monday after Thanksgiving.

    Product brands may be disqualified at our discretion. 

    Must include link to product and website in your email.

    Send all price match requests to