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![Bike makes knocking noise only when pedaling. The cassette cogs have some grooves on them. Is this normal or the cassette is defective? : r/bikewrench Bike makes knocking noise only when pedaling. The cassette cogs have some grooves on them. Is this normal or the cassette is defective? : r/bikewrench](https://i.redd.it/kzrb6cvyqmc51.jpg)
Bike makes knocking noise only when pedaling. The cassette cogs have some grooves on them. Is this normal or the cassette is defective? : r/bikewrench
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