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Martha is making a funny noise. I though initially it was the chain rubbing on the front derailuer but its DEFINATELY not that!
To try and explain its when the left pedal goes from vertical to horizontal, from 12 o'clock to 3 o'clock it grates. It makes the same noise when pedalling backwards aswell. I first noticed the noise when putting effort in yesterday (but thought it was the chain).
Any ideas what could be causing the noise, and what I have to do to fix it?