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How to measure bearings:
Each bearing has an inside diameter, outside diameter and width diameter in that order.
Bearings are METRIC size
ONLY METRIC
A = Inside diameter
B = Outside diameter
C = Width diameter
Example:
Industry Standard Size 6003 2RS
The 2RS Means it has 2 Rubber seals , one on each side to keep lube in and dirt out
Common Swing Arm bearing for pit bikes 6003 2RS Measures 17X35X10
Inside diameter = 17mm
Outside diameter = 35mm
Width diameter = 10mm