I was riding my road bike last night when something strange happened. I stopped at a stop sign. (I didn't have time to slow down so I was in my highest (fastest) gear. When I started I had to press a lot of power into my pedals to get the bike moving again. I was pulling up on the handle bars to press more power into the pedals.
A minute or two later I noticed that my bike was trying to change gears on me. I have non indexed shifters so I expected that I was just between gears. I adjusted the leavers but could not find a spot (in my current gear) where the chain was not trying to shift.
Upon further inspection I noticed that my biggest front chainring was slightly bent. I am not sure if posting a picture would be useful because it is hard to see when it is not spinning. It seems like it is bent maybe 2-6mm towards the frame of the bike.
- Do you think that I bent my chain ring while pedaling? It is possible that it was bent before but something else is now causing my problem (although I don't know what). Is it possible that I bent my chain right by pedaling hard?
- What is the solution to this problem? Can I take a hammer to my chain ring and pound it back into shape? I think that if I do this AND it was bent by hard pedaling then it is likely that it will just be rebent by future hard pedaling.
- If I need to replace the chain ring how complex is this task? Is this something relatively easy that I could do at home or do I need to take it to my LBS? If I take it to my LBS how much should I expect to pay?