ZHENGGUIFANG Professional 1Pc 18307 Hybrid Ceramic Bearing 18x30x7mm ABEC-1 Bicycle Bottom Brackets Spares 18307RS Si3N4 Ball Bearings 18307-2RS

WHAT IS A HYBEID CERAMIC BEARING? A ceramic hybrid bearing is a combination of ceramic balls and bearing quality steel rings. Which combine hardened steel rings with rolling elements made of high-performance ceramic materials, are an increasingly popular option for demanding applications. Special Note: 1, Sometimes the cages will be different. eg.: 67 series thin-walled bearings, because the inner wall is very thin, will use the crown-shaped iron cage. 2, the grease and sealed are accept custom-made, so sometimes there are different colors of the rubber sealed. 3, The standard clearance of bearings is ISO standard C0, the United States standard K25, the clearance value is 3-18um. BEARING STRUCTURE 52100 Chrome Steel Outer Ring & Inner Ring + Si3N4 Ceramic Balls + Nylon Cage + Grease + Sealed = HYBID CERAMIC BEARINGS