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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://preview.redd.it/kzrb6cvyqmc51.jpg?auto=webp&s=1bcfd60e1b4edb4e0f8fe9d3eb05b71555b3a547)
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
My bicycle is making a grinding noise when I pedal. What could it be and how can it be fixed? - Quora
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