The ACL Race Series Main Bearing set in .25 Oversize is a top-of-the-line performance crankshaft component designed specifically for GTiR engines. With a product code of 5M2975H-.25, this high-quality bearing set is manufactured by ACL Race Series, a renowned brand in the industry.

Made from Race Series (Tri-Metal) material, these main bearings are suitable for positions 1 through 5 on the crankshaft. The standard shaft diameter ranges from 2.1636" to 2.1646" (54.956mm to 54.980mm), with a maximum wall thickness of 0.0780" (1.980mm). The housing bore diameter is between 2.3206" and 2.3216" (58.944mm to 58.968mm), and the maximum length is 0.7520" (19.100mm). Additionally, this set includes thrust washers (1T2964-STD) and is .25mm Oversize.

ACL Race Series has a long history of producing precision engine bearings in Launceston, Tasmania, Australia, for over 70 years. As a major OEM supplier to the automotive industry, ACL offers an extensive range of replacement products for the global aftermarket. Their bearings are known for their robust metallurgy, quality, precision, innovation, and performance.

With a strong presence in motorsport, ACL has a rich heritage in racing, dating back to the 1960s with engine bearings for Formula 1 cars. Their RACE Series Performance Engine Bearings are trusted by engine builders worldwide for their durability and performance in various racing disciplines.

The ACL RACE Series Performance Engine Bearing range covers over 200 engine applications from different regions, including Australia, America, Japan, Korea, and Europe. The company is continuously expanding its product line to accommodate new engine releases.

With a focus on vertical integration, ACL manages all aspects of production, from design to manufacturing, ensuring a high level of quality control. Their Business Management Systems are certified with ISO9001:2015 for Quality Management, ISO14001:2015 for Environmental Management, and ISO45001:2018 for Occupational Health and Safety. Trust ACL Race Series Main Bearing set in .25 Oversize for high-performance and reliability in your GTiR engine build.