New answers tagged drivetrain
Here are a couple of ideas: The rear derailleur is maladjusted and is hitting the cassette/freewheel when it's in the lowest gear. Also, the chain could be too short, causing this. How old is your drivetrain? Maybe some of the parts are worn out. The front chainring could be flexing. I don't think this is it, but it's worth checking to make sure the bolts ...
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