ACL Race Series big end bearings for the N54, N55 and S55 engines, as found in E/F Series 135i, M135i, M235i, 335i, 435i, 535i, 635i, M2, M2 Competition, M2 CS, and M3/M4. ACL bearings are a vital upgrade that increase the life and strength of your engine.

Choose from OE oil clearance, or HX series for an extra .001″ as well as oversizes for ground cranks.

Why not add a bottle of Hack Engineering Engine Assembly Lubricant to protect your new bearings on first start up?

Please note that we cannot take opened packets of bearings or bolts as a return – please double check that you have the right components before opening packages.