Bicycle bearing detail information:

Bicycle bearing detail information:
1) Shield / closure: open ball bearing, Z, ZZ, RS, 2RS,2RZ
2) Ball bearings snap ring: N, NR
3) Tolerance codes: ABEC-1, ABEC-3, ABEC-5, ABEC-7
4) Vibration level codes: V4, V3, V2, V1
5) Internal clearance codes: C2, C3, C4, C5
6) Ball bearings material: AISI52100, AISI440C, AISI304, AISI316, ceramic
7) Retainer: PTFE, nylon, PEEK or stainless steel
8) Hardness for rings and balls: 59 - 63HRC
9) Ball bearings bore size: 1 - 200mm 

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