What does the BMW N55 S55 crank hub capture plate actually do?

The MMX BMW N55 S55 crank hub capture plate fully encases the head of the OE crank bolt and bolts to the crank hub assembly, making it physically impossible for the crank bolt to rotate or back out. This eliminates the primary trigger for crank hub timing slip, where even slight bolt loosening from harmonic vibration can pull timing out of alignment.

Is the capture plate enough on its own, or do I need the one-piece crank hub too?

For standard and lightly tuned street-driven N55 and S55 BMWs, the capture plate alone is an effective and cost-efficient first line of defense. For modified, hard-driven, or track-used cars, MMX strongly recommends pairing this capture plate with the MMX one-piece crank hub for complete protection against both bolt loosening and hub slip.

Can I install the capture plate without removing the engine?

Yes. Installation can be performed with the engine remaining in situ. Only the radiator needs to be dropped to gain adequate access. A Level-2 install difficulty rating applies; professional installation is recommended.

Which BMW models does this fit?

The MMX crank hub capture plate fits all BMW models equipped with the N55 or S55 3.0L I6 engine, including the 135i, 235i, 335i, 435i, 535i, 640i, 740i, M135i, M235i, M2, M2 Competition, M2 CS, M3, M4, M4 CS, M4 GTS, X1, X3, X4, X5, and X6 variants listed in the Applications section.

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Description

MMX Billet Crank-Hub Capture Plate for BMW N55 and S55 Engines

BMW N55 S55 crank hub capture plate from MMX Performance addresses the well-documented failure risk of the factory three-piece crank hub design, where harmonic vibration over time can loosen the OE crank bolt, pull timing out of alignment, and cause catastrophic engine damage. Precision-machined from T-6061 billet aluminum and finished in MMX’s signature gloss black anodizing, the plate fully encases the OE crank bolt head and mechanically locks it in place, making rotation or loosening physically impossible. Compatible with both the factory three-piece crank hub and the MMX one-piece crank hub upgrade, elongated mounting slots ensure a precise, repeatable fit every time. Installation can be completed with the engine in situ, requiring only the radiator to be dropped for access, making this an accessible first line of defense for any N55 or S55 BMW.

Features

CNC-machined from aerospace-grade T-6061 billet aluminum
Gloss black anodized finish for corrosion resistance and durability
Fully encases the OE crank bolt head; mechanically prevents rotation and loosening
Compatible with the factory three-piece crank hub and the MMX one-piece crank hub
Elongated mounting slots for precise, secure alignment during installation
Engine-in-situ installation; only the radiator needs to be dropped for access
Eliminates timing slip risk caused by harmonic vibration on N55 and S55 engines
Level-2 install difficulty

Applications

BMW 135i: E82, E88 | 2010-2013
BMW 235i: F22, F23 | 2014-2016
BMW 335i: E90, E91, E92, E93, F30, F31, F34 | 2010-2015
BMW 435i: F32, F33, F36 | 2013-2016
BMW 535i: F07, F10, F11 | 2011-2017
BMW 640i: F06, F12, F13 | 2011-2018
BMW 740i: F01, F02 | 2012-2015
BMW M135i: F20, F21 | 2012-2016
BMW M2: F87 | 2016-2018
BMW M2 Competition: F87 | 2018-2021
BMW M2 CS: F87 | 2020
BMW M235i: F22, F23 | 2014-2016
BMW M3: F80 | 2014-2018
BMW M4: F82, F83 | 2014-2020
BMW M4 CS: F82 | 2017
BMW M4 GTS: F82 | 2016
BMW X1 xDrive35i: E84 | 2013-2015
BMW X3 xDrive35i: F25 | 2011-2017
BMW X4 M40i: F26 | 2015-2018
BMW X4 xDrive35i: F26 | 2014-2018
BMW X5 sDrive35i: F15 | 2014-2018
BMW X5 xDrive35i: E70, F15 | 2011-2018
BMW X6 xDrive35i: E71, F16 | 2010-2019

Notes

Compatible with N55 and S55 engines only
The crank hub pictured is not included; shown for illustration purposes only
Sold as a single capture plate
Read about N55 and S55 crank hub failures here

Frequently Asked Questions

What does the BMW N55 S55 crank hub capture plate actually do? The MMX BMW N55 S55 crank hub capture plate fully encases the head of the OE crank bolt and bolts to the crank hub assembly, making it physically impossible for the crank bolt to rotate or back out. This eliminates the primary trigger for crank hub timing slip, where even slight bolt loosening from harmonic vibration can pull timing out of alignment.
Is the capture plate enough on its own, or do I need the one-piece crank hub too? For standard and lightly tuned street-driven N55 and S55 BMWs, the capture plate alone is an effective and cost-efficient first line of defense. For modified, hard-driven, or track-used cars, MMX strongly recommends pairing this capture plate with the MMX one-piece crank hub for complete protection against both bolt loosening and hub slip.
Does the BMW N55 S55 crank hub capture plate fit the factory crank hub? Yes. The capture plate is compatible with both the factory OE three-piece crank hub and the MMX one-piece crank hub upgrade. Elongated mounting slots ensure a precise fit with either hub.
Can I install the capture plate without removing the engine? Yes. Installation can be performed with the engine remaining in situ. Only the radiator needs to be dropped to gain adequate access. A Level-2 install difficulty rating applies; professional installation is recommended.
Which BMW models does this fit? The MMX crank hub capture plate fits all BMW models equipped with the N55 or S55 3.0L I6 engine, including the 135i, 235i, 335i, 435i, 535i, 640i, 740i, M135i, M235i, M2, M2 Competition, M2 CS, M3, M4, M4 CS, M4 GTS, X1, X3, X4, X5, and X6 variants listed in the Applications section above.

About MMX Performance

MMX Performance is a UK-based specialist in performance parts for BMW and MINI vehicles, crafting high-quality upgrades that blend precision engineering, rigorous testing, and motorsport heritage. Driven by enthusiast culture, MMX designs its products in the UK and puts them through track validation to ensure durability, fitment accuracy, and on-road performance. Their catalog spans drivetrain components, spacers, hardware, and chassis enhancements, all tailored to elevate both the driving experience and visual appeal of BMW and MINI models.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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MMX Billet Crank-Hub Capture Plate for BMW Vehicles (with N55 / S55 engines) [MMR20-1002]

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MMX Billet Crank-Hub Capture Plate for BMW N55 and S55 Engines

Features

Applications

Notes

Frequently Asked Questions

About MMX Performance

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