Try and see if a 3/32" chain will fit onto it. If it won't and the chain sits above the teeth then it's 1/8". If it does sit in the teeth then it's 3/32"
@A_EF started
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Try and see if a 3/32" chain will fit onto it. If it won't and the chain sits above the teeth then it's 1/8". If it does sit in the teeth then it's 3/32"