BMW S55 Crank Hub Lock Ring Fix/Solution by VTT – Crankshaft Bolt Capture Retainer / Crank Pulley Bolt Guard/Locking Plate – Fits M3 M4 M2 Competition (F80 F82 F83 F87) – Bottom End Protection Upgrade

Protect your S55 bottom end with a proven crankshaft bolt locking solution

Safeguard your BMW’s 3.0 twin‑turbo S55 engine with this precision‑machined crankshaft bolt retainer by VTT. The ring encircles the crank bolt head and mechanically ties it to the hub to stop unwanted rotation under hard use, helping prevent slippage on fast road, track, and tuned applications. It is a simple, cost‑effective reliability upgrade for F‑series M cars that want peace of mind without adding unnecessary rotating mass.

• Aerospace‑grade billet aluminium, hard‑anodised black for corrosion resistance and a subtle OEM+ look
• Ultra‑light at just 1.3 oz, so it does not meaningfully affect crank balance or introduce vibration
• Locks the crank bolt head to the hub to keep torque where it belongs during aggressive driving
• Ideal for stock and remapped S55 engines alike, from daily drivers to track toys
• Durable design with high‑tensile hardware for long‑term reliability

What’s in the box

• 1 x billet aluminium crankshaft bolt retainer ring
• 8 x Grade 12.9 fasteners

Vehicle compatibility

Designed for all BMW models equipped with the S55 3.0L engine, including:

• BMW M3 F80
• BMW M4 F82 and F83
• BMW M2 Competition and M2 CS F87

Why choose this upgrade

Owners of S55‑powered cars often look for a dependable crank hub locking aid that adds confidence without unnecessary complexity. This compact locking ring delivers exactly that. It is light, strong, and engineered to keep the crank bolt from rotating, which helps protect your investment when you drive hard or increase power.

Fitting service

Professional installation is recommended. MJ Modifications offers fitting at our Warwickshire workshop. For a quote or to book, email info@mjmodifications.co.uk.

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