I’m sure there was a thread about something like this a few weeks ago, I was going to have a look to see what was said but can’t find it in searches.
Basically, on my commuter bike, when I pedal I get a swishing/scraping noise, almost like the chain is rubbing on the front mech for the whole revolution – it’s not, happens in large and middle ring. Doesn’t happen when I back-pedal, only under load. Difficult to diagnose on a stand as I can’t replicate it without pedalling on it.
Nothings loose.
Seems to be getting worse with use.
I’m pretty sure my poor old legs are not producing awesome frame/bb/chainset warping power.
Any thoughts?