King CR4538CA0.25 CA-Series Rod Bearings MINI Cooper S JCW W11B16A +0.25mm OS

Vehicle Fitment

• 2002-2006 MINI Cooper S Hardtop R53 (W11B16A, 1.6L Supercharged I4, FWD)
• 2003-2006 MINI John Cooper Works / Works GP / MC40 R53 (W11B16A, 1.6L Supercharged I4, FWD)
• 2005-2008 MINI Cooper S Convertible R52 (W11B16A, 1.6L Supercharged I4, FWD)
• 2005-2008 MINI John Cooper Works Convertible R52 (W11B16A, 1.6L Supercharged I4, FWD)
• 2007-2014 MINI Cooper S Clubman R55 (W11B16A, 1.6L Supercharged I4, FWD)
• 2009-2016 MINI Cooper S Hardtop R56 / R57 (W11B16A, 1.6L Supercharged I4, FWD)
• 2009-2016 MINI John Cooper Works Hardtop / Convertible R56 / R57 (W11B16A, 1.6L Supercharged I4, FWD)
• 2012-2015 MINI Cooper S / JCW Coupe R58 (W11B16A, 1.6L Supercharged I4, FWD)
• 2012-2015 MINI Cooper S / JCW Roadster R59 (W11B16A, 1.6L Supercharged I4, FWD)
• 2013 MINI John Cooper Works GP R56 (W11B16A, 1.6L Supercharged I4, FWD)
• 2011-2016 MINI Cooper S / JCW Countryman R60 (W11B16A, 1.6L Supercharged I4, FWD/ALL4)
• 2013-2016 MINI Cooper S / JCW Paceman R61 (W11B16A, 1.6L Supercharged I4, FWD/ALL4)

Fitment Notes

• Fits MINI W11B16A supercharged (Eaton M45) 1.6L Tritec engine only - does not fit the naturally aspirated W10B16A Cooper / One (see CR4537CA0.25 for that application)
• +0.25mm oversize - for use with crankshafts reground -.010" (0.25mm) undersize; crankshaft machining is required before installation
• Always confirm crankshaft undersize with your machine shop before ordering
• Does not fit Gen 3 MINI (F55/F56) or any MINI using the BMW N14, N16, N18, or Prince-series engine
• Engine bore: 77.0mm, stroke: 85.8mm, displacement: 1,598cc, compression ratio: 8.3:1

Features

• CA-Series tri-metal copper-based construction - King's classic OE-replacement material designed for medium-load supercharged applications
• +0.25mm oversize restores proper oil clearance on cranks reground to -.010" undersize without compromising bearing load distribution
• High fatigue strength and superior temperature threshold versus bimetal designs, suited for sustained heat loads of supercharged W11B16A operation
• Improved crankshaft finish compatibility reduces microscopic ferrite peaks on improperly ground or polished journal surfaces
• Improved oil clearance over worn or undersize OE shells reduces wear and extends engine life while minimizing noise, vibration, and excess oil flow
• Bull's Eye Tolerance manufacturing ensures tight wall thickness consistency shell to shell

Specifications

• Part Number: CR4538CA0.25
• Bearing Type: Connecting Rod Bearing Set
• Series: CA-Series (Tri-Metal Copper-Based)
• Material: Tri-metal copper-lead alloy over steel backing
• Size: +0.25mm oversize (for cranks reground -.010" / 0.25mm undersize)
• Engine: MINI W11B16A, 1.6L Supercharged (Eaton M45) 16V I4
• Bore x Stroke: 77.0mm x 85.8mm
• Displacement: 1,598cc
• Compression Ratio: 8.3:1
• Machining Required: Yes (crankshaft must be reground to -.010" undersize)
• Dowel Pin Hole: No

Included Components

• 4x Connecting Rod Bearing Sets / 8x Total Bearing Shells (CR4538CA0.25)

Product Description

The King CR4538CA0.25 is a +0.25mm oversize CA-Series tri-metal connecting rod bearing set engineered for the MINI W11B16A supercharged 1.6L Tritec engine, covering first-generation Cooper S and JCW variants (R52/R53) as well as second-generation Cooper S, JCW, Clubman, Countryman, Paceman, Coupe, and Roadster models that continued to use the W11B16A. This oversize set is the correct choice when the crankshaft has been reground to a -.010" (0.25mm) undersize to restore a proper bearing surface during engine rebuild, ensuring accurate oil clearance is maintained without requiring a full crank replacement.

King's CA-Series tri-metal copper-based material provides the fatigue strength and temperature resistance needed for the sustained demands of a supercharged engine, offering a reliable OE-grade solution for W11B16A rebuilds. Manufactured to King's Bull's Eye Tolerance standards for consistent shell-to-shell wall thickness, these bearings minimize selective fitting and simplify assembly. Crankshaft machining to -.010" undersize is required prior to installation - always confirm sizing with your engine builder or machine shop before ordering, and verify your MINI uses the W11B16A engine rather than the later N14, N16, or N18 Prince-series units.