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Something is dragging as you pedal harder. The most likely thing is that your rear wheel is moving so that the tire drags against the chain stay when you apply power. This is something that you'll probably need to troubleshoot when you're riding because it isn't likely to show up with the bike on a work stand. You might be able to make it happen by applying ...


My guess is that your rear end is flexing and either: Rear rim is touching the brake pad, or Tire is rubbing the chainstay With the former, try checking your wheel alignment and loosing your brakes a bit (safely) and testing. With the latter, look for tire rub marks in your chainstay area where the chainstay meets the bottom bracket.

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