King MB7776SI0.25 0.25 O/S Main Bearing Set for 2006-2021 BMW N52/N53/N55 Engine

Regular price: $90.95
Regular price
Sale price: $90.95

Shipping calculated at checkout.

In Stock: 134

Orders by 1pm PST ship same business day

Free Shipping w/3-4 Day Delivery

Authorized Dealer

Fitment Guarantee

30-Day Hassle Free Returns

Product Specification:

SKU:KINGMB7776SI0.25

MPN: MB7776SI0.25

UPC: 611500587276

Weight: 1.1 lb

Inventory: 134

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 with 2.5-3% Si for durability
+0.25 mm oversize to restore oil clearance on machined crank journals
360° oil groove for optimal lubrication
Engineered to OEM journal width and clearances
Covers front, intermediate & rear journals - complete crank support
Suitable for both forged and cast crankshafts
Manufactured in USA since 1960 with rigorous QC
Ideal for medium-load rebuilds or bolt-on performance builds

Specifications

Oversize: +0.25 mm (0.0098")
Bearing width: 18.80 mm; thickness: 2.499 mm; journal shaft size: 55.961-55.979 mm; housing bore: 61.001-61.018 mm :contentReference[oaicite:1]{index=1}
Material: aluminum-silicon overlay on steel backing :contentReference[oaicite:2]{index=2}
Complete 7-pair set covers all main journals (front, intermediate, rear)

Included Components

7x pairs of main bearings (front, 4x intermediate, rear)

Product Description

The King MB7776SI0.25 Main Bearing Set is engineered for BMW N52, N53, and N55 engines (2006-2021) that have been machined or slightly worn beyond factory clearances. The +0.25 mm oversize ensures optimum oil film thickness across all main journals, promoting long-term reliability and reducing friction. The silicon-aluminum overlay delivers excellent wear resistance and embedability - ideal for both OEM-style rebuilds and upgraded performance applications.

This bearing set comes with seven pairs to support the entire crankshaft (front, intermediate, and rear journals). The full 360° oil groove ensures consistent lubrication even under demanding conditions. It's compatible with both RWD and AWD platforms across numerous BMW series, making it a versatile choice for engine shops and enthusiasts rebuilding 1-Series through X-Series models. If greater oversize is needed, consider the 0.50 mm or 0.75 mm variants from King.