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Many times the size of the chain will be stamped on the front sprocket, along with the number of teeth (for example, "420-12T"). You can also determine the chain size by measuring the thickness of the sprocket:
420 = .23" / 5.84mm with Roller Diameter = .3125" |
428 = .27" / 6.76mm |
520 = .23" / 5.84mm with Roller Diameter = .4" |
530 = .30" / 7.81mm |