High-output N55 and S55 engines are known to place extreme stress on the factory crank hub system, especially under aggressive driving, hard downshifts, and increased power levels. Under these conditions, the crank bolt can loosen or allow slight hub movement — a failure that can lead to catastrophic engine damage.

This crank hub bolt capture kit is designed as a preventative solution, mechanically locking the crank bolt in place to reduce the risk of rotation or bolt walkout. It adds an extra layer of protection without permanently modifying the engine, making it an ideal upgrade for both street-driven and track-focused builds.

Key Features

• Precision-machined billet aluminum construction for strength with minimal added weight
• Designed to mechanically lock the crank bolt and limit hub movement
• Anodized finish for corrosion resistance and long-term durability
• Lightweight design maintains crank balance and rotational efficiency
• Provides added engine protection under high load and high RPM conditions

Why This Upgrade Matters

• Helps reduce the risk of crank hub rotation on high-output engines
• Acts as a mechanical safeguard beyond thread locker alone
• Ideal for tuned, track-driven, or aggressively driven vehicles
• Insurance-style upgrade that protects critical engine components

Important Installation Notes

• Designed specifically for N55 and S55 engines only
• In some cases, alignment may require slightly increased bolt stretch or a new crank bolt to achieve proper clocking
• Professional installation is recommended

Engine Compatibility

• N55 Engine Applications
• S55 Engine Applications

Vehicle Fitment

• BMW 335i (E90 / E91 / E92 / E93)
• BMW 135i / 135is (E82 / E88)
• BMW M135i / M135i LCI (F20 / F21)
• BMW M235i (F22 / F23)
• BMW 535i (F10 / F11 / F07)
• BMW 435i (F32 / F33 / F36)
• BMW X1 / X3 / X4 / X5 / X6 with N55 engine
• BMW M2 Competition (F87)
• BMW M3 (F80)
• BMW M4 (F82 / F83)

What’s Included

• 1x Crank Hub Bolt Capture Plate

This upgrade is strongly recommended for any N55 or S55 platform that sees spirited driving, increased boost, or track use. A small investment that can help prevent one of the most costly engine failures associated with these platforms.