![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
![Clicking sound when pedaling. Is this normal? It also has a bit of resistance while backpedaling, not much but noticable. : r/bikewrench Clicking sound when pedaling. Is this normal? It also has a bit of resistance while backpedaling, not much but noticable. : r/bikewrench](https://external-preview.redd.it/S2F6wP3LPGQqhoeQlmLNhNidVpeVTCU1Q1cSyvztsw0.jpg?auto=webp&s=6c0c6d2d10e865623da5b7c8e7e2bc56ee2a02ac)
Clicking sound when pedaling. Is this normal? It also has a bit of resistance while backpedaling, not much but noticable. : r/bikewrench
![Advice, please! Brompton ticking while pedaling. My fairly new Brompton keeps making noise ( ticking sounds) only when pedaling. I found some old posts about same problem but It seems there is Advice, please! Brompton ticking while pedaling. My fairly new Brompton keeps making noise ( ticking sounds) only when pedaling. I found some old posts about same problem but It seems there is](https://external-preview.redd.it/EUfniJjmmCcyoq866DgJV1yQmJbfhRWDMLMuBlMfbmg.png?format=pjpg&auto=webp&s=9c977293ccd484af98c055e6f42340dd22bca87f)