King MB7779SM STD SM Main Bearings BMW B58 Toyota GR Supra 3.0L Turbo I6 Mn-Cr

Vehicle Fitment

• 2020-2026 Toyota GR Supra (Base, Premium, 3.0, A91, A91-CF, RWD, 3.0L Turbo I6 B58B30)
• 2019-2026 BMW Z4 (sDrive30i, M40i, G29, RWD, 3.0L Turbo I6 B58B30)
• 2016-2026 BMW 340i / 340i xDrive (F30/F31/F34, Base, RWD/AWD, 3.0L Turbo I6 B58B30)
• 2017-2026 BMW 440i / 440i Gran Coupe / 440i xDrive (F32/F36/F33, Base, RWD/AWD, 3.0L Turbo I6 B58B30)
• 2017-2026 BMW 540i / 540i xDrive (G30/G31, Base, RWD/AWD, 3.0L Turbo I6 B58B30)
• 2017-2026 BMW 640i Gran Turismo xDrive (G32, Base, AWD, 3.0L Turbo I6 B58B30)
• 2016-2026 BMW 740i / 740i xDrive / 740Li (G11/G12, Base, RWD/AWD, 3.0L Turbo I6 B58B30)
• 2018-2026 BMW X3 xDrive30i / M40i (G01, Base, AWD, 3.0L Turbo I6 B58B30)
• 2019-2026 BMW X4 xDrive30i / M40i (G02, Base, AWD, 3.0L Turbo I6 B58B30)
• 2019-2026 BMW X5 xDrive40i / M50i (G05, Base, AWD, 3.0L Turbo I6 B58B30)
• 2020-2026 BMW X6 xDrive40i / M50i (G06, Base, AWD, 3.0L Turbo I6 B58B30)
• 2018-2026 BMW M240i / M240i xDrive (F22/F23/G42, Base, RWD/AWD, 3.0L Turbo I6 B58B30)
• 2022-2026 BMW M440i / M440i xDrive (G22/G26, Base, RWD/AWD, 3.0L Turbo I6 B58B30)

Fitment Notes

• Fits BMW B58B30 3.0L Twin-Scroll Turbo inline-6 engine and Toyota GR Supra B58 variant sharing the same main journal diameter - confirm engine code before ordering
• Standard (STD) size - for use on crankshafts at factory main journal diameter; always measure journals before ordering
• SM Series = the strongest aluminum-based bi-metal in King's lineup, with Manganese and Chromium (Mn, Cr) alloy additions for superior hardness and wear resistance vs. standard SI or MC Series - ideal for high-load OE-replacement and performance street builds
• Does not fit the N54, N55, or S55 inline-6 engines - B58 is a distinct engine platform; verify engine code before ordering
• Available in STD, +0.25mm, +0.50mm, and +0.75mm undersizes under separate part numbers for ground crankshafts

Features

• SM Series aluminum alloy strengthened by Manganese and Chromium (Mn, Cr) additions - the hardest and strongest aluminum-based material in King's product range
• Superior wear resistance vs. standard SI or MC Series - designed for high-load turbocharged applications where conventional aluminum bi-metal may not provide sufficient fatigue resistance
• Lead-free construction meets current environmental compliance standards
• Full 7-pair set covers all main crankshaft journals in the inline-6 engine
• Tight wall thickness tolerances ensure consistent oil clearance across all 7 main journals
• Ideal for high-output B58 builds requiring a tougher-than-OE bi-metal solution without stepping up to full tri-metal construction
• Manufactured under IATF 16949 and SAE AS 9100 certified quality control

Specifications

• Part Number: MB7779SM
• Size: Standard (STD)
• Series: SM (Bi-Metal Manganese-Chromium Strengthened Aluminum - High-Load OE Replacement)
• Engine: BMW B58B30 3.0L Turbo Inline-6 / Toyota GR Supra B58 3.0L Turbo I6
• Position: Crankshaft Main (Upper and Lower shells)
• Quantity: 7 pairs (14 shells total - full I6 main bearing set)
• Available Sizes: STD / +0.25mm / +0.50mm / +0.75mm

Included Components

• 7x Upper Main Bearing Shells
• 7x Lower Main Bearing Shells

Product Description

The King MB7779SM is a standard-size SM Series crankshaft main bearing set engineered for the BMW B58B30 3.0L Twin-Scroll Turbo inline-6 and the Toyota GR Supra B58 variant, covering a wide range of BMW 2 Series, 3 Series, 4 Series, 5 Series, 6 Series, 7 Series, X3, X4, X5, X6, Z4, and the Toyota GR Supra from 2016 onward. The SM Series uses King's strongest aluminum-based alloy - reinforced with Manganese and Chromium (Mn, Cr) additions that significantly increase hardness and wear resistance compared to the standard SI and MC Series. This makes it the ideal OE-replacement upgrade for high-output B58 builds where conventional aluminum bi-metal may not provide sufficient fatigue life under sustained turbocharged loads.

Positioned between King's standard SI/MC bi-metal bearings and the full XP tri-metal race construction, the SM Series is the go-to choice for builders seeking a meaningful upgrade over OE material without the cost or clearance considerations of a full race bearing. As a standard-size set, the MB7779SM fits B58 crankshafts at factory main journal diameter. Always measure crankshaft main journals with a precision micrometer before ordering. Undersized variants are available under separate part numbers for crankshafts that have been reconditioned.