King MB7776SI Main Bearing Set for 2006-2021 BMW N52/N53/N55 Engines (STD)

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Product Specification:

SKU:KINGMB7776SI

MPN: MB7776SI

UPC: 611500587269

Weight: 1.1 lb

Inventory: 224

Type: Bearings

Vehicle Fitment

2006-2021 BMW 1-Series/2-Series/3-Series/4-Series/5-Series/6-Series/7-Series/X-Series/Z-Series (N52B30A, N53B30A, N55B30A) - RWD/AWD

Features

Bimetal silicon-aluminum overlay for OEM-level wear resistance
Standard size - fits unmachined crank journals without modification
360° oil groove ensures consistent lubrication
Bull's Eye Tolerance™ for precise shell-to-shell thickness consistency
Engineered to meet factory dimensions for crankshaft support
Suitable for forged and cast cranks under stock to moderate loads
Manufactured in USA since 1960 with rigorous QC
Backed by 12-month warranty

Specifications

Size: STD (no oversize)
Material: aluminum-silicon overlay on steel backing (2.5-3% Si)
Shell thickness tolerance consistent per King standards (Bull's Eye Tolerance™)
Crankshaft journal fit: ~0.000" nominal for N52/N53/N55 series
Complete 7-pair set covers front, intermediate, and rear main journals

Included Components

7x pairs of main bearings (front, 4x intermediates, rear)
Warranty and product documentation

Product Description

The King MB7776SI Main Bearing Set provides a direct, standard-size replacement for BMW N52, N53, and N55 engine blocks from 2006 through 2021. Built with a durable bimetal silicon-aluminum overlay and precise Bull's Eye Tolerance™, this set delivers OEM-level fitment without requiring crank machining. A full 360° oil groove ensures efficient lubrication under everyday driving and moderate performance use.

Ideal for stock rebuilds or performance engines operating within factory tolerances, this 7-pair set supports both RWD and AWD configurations across BMW's 1/2/3/4/5/6/7/X/Z-Series lineup. Enthusiasts appreciate the SI series for its "embedability" and reliability - users report excellent longevity - even under spirited RPM usage. If your rebuild involves machined journals or higher performance demands, consider the SI oversize (+0.25, +0.50, +0.75 mm) or the HP series.