The description is kind of confusing. When you say it throws you off, do you mean your foot literally gets thrown off the pedal? Or does it just feel like there's no resistance coming from the drivetrain? Does this occur intermittently, or does it happen with the pedal revolution or does it happen on a regular basis but not at same rate as pedal rotation? How old or how many miles have been put on the bike?

Could be your chain and/or chainrings are worn and needs to be replaced


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