{"product_id":"acl-main-bearings-bmw-n54-n55-s55","title":"ACL Race Series Main Bearing Set - BMW N54\/N55\/S55B30","description":"\u003cp\u003eUpgrade your bottom end with ACL Race Series tri-metal main bearings, engineered for high-RPM performance and forced-induction reliability. Steel-backed with copper-lead-tin lining for improved fatigue strength and retention, increased crush for better retention, and enlarged ID chamfers to clear performance crankshaft fillets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e BMW N54B30, N55B30, S55B30 (3.0L Inline-6)\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e — stock, unworn crank journals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard HX\u003c\/strong\u003e — same size as standard, +0.001\" extra clearance, for built engines running higher oil temps\/RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.025mm Undersize\u003c\/strong\u003e — fine trim, minor crank cleanup\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.25mm Undersize\u003c\/strong\u003e — first regrind step\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.50mm Undersize\u003c\/strong\u003e — second regrind step\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ Before ordering an undersize set, confirm your crank has been machined to the matching undersize spec — check clearances with Plastigauge before final assembly.\u003c\/p\u003e","brand":"ACL","offers":[{"title":"Standard","offer_id":48848641917153,"sku":"7M1397H-STD","price":256.99,"currency_code":"USD","in_stock":true},{"title":"Standard HX","offer_id":48848641949921,"sku":"7M1397HX-STD","price":256.99,"currency_code":"USD","in_stock":true},{"title":"0.025mm Undersize","offer_id":48848641982689,"sku":"7M1397H-.025","price":256.99,"currency_code":"USD","in_stock":true},{"title":"0.25mm Undersize","offer_id":48848642015457,"sku":"7M1397H-.25","price":256.99,"currency_code":"USD","in_stock":true},{"title":"0.50mm Undersize","offer_id":48848642048225,"sku":"7M1397H-.50","price":256.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0655\/7355\/2353\/files\/ACL_Race_Series_main_bearing_set_for_BMW_N54_N55_S55B30.jpg?v=1785804294","url":"https:\/\/europeanengineparts.com\/products\/acl-main-bearings-bmw-n54-n55-s55","provider":"European Engine Parts","version":"1.0","type":"link"}