SKU: 9600141933

MMR Crank Hub 4-Pinned Single Piece Upgrade - BMW / S55 / N55

Sale price$484.20 Regular price$538.00
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Description

MMR Crank Hub 4-Pinned Single Piece Upgrade - BMW / S55 / N55Engine failures caused by the standard three piece crank hub on the S55 & N55 engine are (unfortunately) well known, but these are fully addressed with the installation of the MMR Performance 4 Pinned Single Piece billet Crank Hub, together with the option of adding our Capture Plate for ultimate security. MMR Performance now offers this uprated version of our popular Single Piece Crank Hub, with a 4 Pin dowelled location that locks onto the end of


Engine failures caused by the standard three-piece crank hub on the S55 & N55 engine are (unfortunately) well known, but these are fully addressed with the installation of the MMR Performance 4-Pinned Single-Piece billet Crank Hub, together with the option of adding our Capture Plate for ultimate security.



MMR Performance now offers this uprated version of our popular Single-Piece Crank Hub, with a 4-Pin dowelled location that locks onto the end of the crankshaft.

The OE crank hub unit's friction plate are known to slip rotationally, causing the timing to alter enough that piston-to-valve contact can occur, leaving owners with a very expensive repair bill.

This 4-pin version of our Single-Piece Crank Hub kit is simply the ultimate solution to preventing this problem before it happens on high horsepower & torque engines.

The centerpiece of the MMR kit is the UK made CNC-machined one-piece crank hub, created from billet EN36 steel that's been heat-treated with a 0.75mm case hardening, making it incredibly strong and durable. Along with this comes four aerospace precision machined dowels that mechanically lock the hub to end of the crank itself, plus a brand new OE bolt.

Installation of these dowels is certainly not a DIY job. But to make the job easier for the professionals, ensuring that the required crank modifications are made safely and accurately, the MMR kit also includes a full installation jig that includes a bolt-on drilling guide, a location bolt for this guide, plus an HSS rolled high speed Drill Bit.



Together, the Single-Piece design combined with the 4-Pin location ensures that there is now no way that the friction plates can ever slip. With the new OE crank bolt tightened appropriately, this delivers a transformational improvement in reliability versus the OE version.

As MMR Performance offers two versions of the Single-Piece Crank Hub, which is best for you, pinned or unpinned?  For most standard to Stage 1 tuned S55 & N55 engines, the unpinned MMR Single-Piece Crank Hub (MMR20-1003) is more than sufficient. Installation is more straightforward as the end of the crankshaft does not need to be precision drilled to mount the four locating dowels. However, for high power/torque engines tuned beyond this level, we recommend this upgraded pinned version of the Crank Hub that incorporates the 4-pin dowel drive mounting for the ultimate engine security.



OE Multi-Piece Crank Hub (L) compared to MMR Single Piece Crank Hub (R) 

Finally. as another option alongside the 4-Pinned Crank Hub, adding the MMR Capture Plate ensures that owners have complete peace of mind.

The Capture Plate removes the possibility for the crank bolt to be able to loosen with the engine's vibrations or harmonics. The Capture Plate is an additional billet aluminum hat that securely bolts over the entire head of the crank bolt, making it literally impossible for the bolt to come undone. Please select from the product option below at point of ordering to include a Capture Plate with your order.



Single-Piece Crank Hub (L) with Capture Plate (R)

S55 and N55 bolt torque – 100Nm initial torque plus 270 degrees.

For BMW M2C, M3 and M4 S55-engined cars running high power and torque tuning setups, and N55-powered M2, M135i, M235i, 335i & 435i cars, MMR have engineered the most comprehensive solution on the market and at one of the most compelling price points. Don't run high power without one!


Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 9600141933

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Serina Anthony
Lexington, US
★★★★★ 1
Do not buy Epson if you expect it to last.
Style: WF-3820 (Renewed)
I had previously had HP printers and they worked extremely well, honestly I had them for years and years at a time, much longer than would probably be typical for an at-home printer that gets a lot of use. I bought an Epson replacement as the price was right. I replaced the ink once in it, and it worked fine...then it would never read new ink. Well, it would read it was full, but it would print extremely light and if you had a barcode (like to return an Amazon package) the barcode would not print correctly to be able to use for shipment. So, I thought I must have just gotten a bad printer and that it was a year old so I guess it was due...so I bought this one. I have had it since May and just replaced the black in - and it is now doing the SAME thing as the previous Epson. It will not print correctly. I called Espon support and was told they could send me a new one BUT I had to give a CC# for them to 'hold' and it would not be charged if I returned the item. Well, then once it got down to it, she then stated that when the new one was sent back, they would 'review to make sure it is covered under warranty' and that it is 'their property' then, and if it is not under warranty, I would be charged...which was TWICE what I paid for the printer originally. So I told her nevermind. She could not understand why, which they state some arbitrary statement that 'if' it is found to be 'under warranty' then I would not be charged, but also specifying once returned it is their property. So, basically that sounded too 'iffy' to me and I am not going to return something to MAYBE not get charged DOUBLE what I paid for the item to begin with. That seems like a scam to get paid for the replacement item to be honest.
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Reviewed in the United States on September 11, 2023
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Mitchell Croy
Lake Worth, US
★★★★★ 5
Prints perfectly
Style: WF-3820 (Renewed)
Fast and clear printing
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Reviewed in the United States on March 17, 2024
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Cowboy Karl
Boise, US
★★★★★ 5
Fast easy set up and comes with ink
Style: WF-3820 (Renewed)
Fast easy set up and comes with ink. A larger touch screen would help.
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Reviewed in the United States on March 10, 2024
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Yovanni Matta
Belleville, US
★★★★★ 2
Bad worst experience.
Style: WF-3820 (Renewed)
Unfortunately I couldn't enjoy this all in one printer. I'm sure that it is a well-made printing machine. I had to return my printer the next day since it didn't came with the proper ink cartridges the proper instruction manual or the CD to set the computer up. I did manage to purchase new ink cartridges for this Epson printer unfortunately when I went through the setup process and install the ink cartridge the printer kept jamming on me. I don't know if the reason that I was having difficult with this printer it's because it was a refurbished printer. Try to resolve issue with printer over the phone with Amazon but that was a disappointment.
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Reviewed in the United States on February 4, 2025
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Derek
Houston, US
★★★★★ 5
Trustworthy
This protection plan is honest and true. I never purchase any electronics without it, not because I don't trust the product, but because anything can happen and ASURION has always come through when I needed them.
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Reviewed in the United States on May 8, 2026

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