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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Ships within 48 hours · Estimated delivery Jul 22 - Jul 27

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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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proud owner of too many dogs
Alexandria, US
★★★★★ 5
Holds up well with aggressive chewers.
Size: X-Small, Color: Pig
This is my dog's favorite toy. And she has LOTS of toys so that is big endorsement. Miss Trina ( 40 pound boxer) loves to squeak it in Enzo's ( big brother 140 pound Cane Corso) face when he is sleeping. They also play tug of war . They destroy the toy eventually ( we are on the third one) but it holds for a few weeks. Miss Trina also likes to par corps around the house with this toy. Her favorite way to use this toy is bring it my husband for him to throw it . If he is napping she just drops in on his face. Definately recommend this toy.
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Reviewed in the United States on May 17, 2026
L
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LuanaClarice
Pawtucket, US
★★★★★ 4
Fun toy for my dogs but squeaker broke easily
Size: X-Small, Color: Pig
So far my aggressive chewer dog hasn’t been able to rip this toy apart but in one day she did break the squeaker inside. But I like that she hasn’t been able to rip it apart so it is pretty tough. I got this on a deal so it was good price for a toy that will last. Put 1 star down because the squeaker quality wasn’t the best when she was able to break it so fast. Esp love that it has no stuffing. And it’s a cute pink pig which is great.
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Reviewed in the United States on May 23, 2025
A
Verified Purchase
Amazon Customer
Battle Creek, US
★★★★★ 5
My puppy loves this pig
Size: X-Small, Color: Pig
This pig is great! My puppy loves it. It’s fun to throw. It’s soft and furry on the outside with strong edges and very durable. We’ve had it 4 months while my puppy was teething and it’s as good as new. It’s adorable too! 5 out of 5 stars !
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Reviewed in the United States on June 11, 2026
M
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Mona
San Leandro, US
★★★★★ 5
Dog toy.
Size: X-Small, Color: Fox
Pitbull and the Yorkie both like these toys. Not very durable though.
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Reviewed in the United States on May 21, 2026
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Amazon Customer
New York, US
★★★★★ 5
Has the chihuahua puppy seal of approval!
Size: X-Small, Color: Fox, Size: X-Small, Color: Fox
I bought this for my chihuahua puppy who was already a fan of the waffle toy made by this company. Compared to that one, this one is more plush, has a different squeaker sound, and isn't quite as firm overall. It's a really cute toy and she enjoys playing with it. So far it has held up really well to her tiny shark teeth. The material seems both soft and durable. Great for toy and small breed dogs and puppies.
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Reviewed in the United States on June 9, 2026

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