What does '0.25mm undersize' mean for these rod bearings?

This means the bearings are manufactured to be slightly smaller than the standard size. They are intended for use with a crankshaft that has been machined down by 0.25mm to ensure a precise, tight fit. This is common in performance engine builds or rebuilds.

Are these bearings suitable for a stock engine?

These bearings are 0.25mm undersize and are typically used when the crankshaft has been machined. For a stock, unmachined crankshaft, you would generally need standard size bearings. It's always best to confirm your crankshaft's specifications before ordering.

What is the primary benefit of using these performance rod bearings?

These ACL performance rod bearings are built to withstand higher stresses found in modified or high-performance engines. They help ensure proper oil clearance and lubrication, which is crucial for engine longevity when power output is increased.

ACL BMW B58 / Toyota Supra B58 0.25mm Oversized Performance Rod Bearing Set

Specifications

Brand: ACL
Part #: 6B1510H-.25
UPC: 9315726456040

ACL BMW B58 / Toyota Supra B58 0.25mm Oversized Performance Rod Bearing Set

Name: ACL BMW B58 / Toyota Supra B58 0.25mm Oversized Performance Rod Bearing Set
Brand: ACL
Price: 183.63 USD
Availability: InStock

$183.63

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ACL BMW B58 / Toyota Supra B58 0.25mm Oversized Performance Rod Bearing Set. Fits 2016-2018 BMW 340i, 2018-2019 X3, and 2020 Toyota Supra.

Key Features

Fits 2016-2018 BMW 340i, 2018-2019 BMW X3, and 2020 Toyota GR Supra.
Set includes 0.25mm undersize connecting rod bearings.
Designed for BMW B58B30 and S58B30 3.0L Inline 6 engines.
ACL is a well-known manufacturer of engine components.
Helps maintain proper oil clearance for performance engines.

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Fits these vehicles

BMW 340i 2016-2018
BMW X3 2018-2019
Toyota GR Supra 2020

Product Details

When you're pushing your BMW B58 or Toyota Supra B58 engine hard, especially if you've made some performance upgrades, the stock rod bearings can become a weak point. This set from ACL is built to handle more stress. They're a 0.25mm undersize, meaning they're designed to fit crankshafts that have been machined down slightly to ensure a perfect, tight fit after performance work. This helps maintain proper oil clearance, which is critical for keeping your engine running smoothly under demanding conditions.

ACL has a solid reputation for making well-built engine components. These bearings are a popular choice for enthusiasts looking to ensure their engine's bottom end can keep up with increased power. If you're rebuilding or upgrading your B58 or S58 engine, these bearings are a smart move to protect your investment.