Hi,

I've got this old Bates road bike and recently I've noticed that if I'm in the highest gear and back pedal when at traffic lights to get my foot in the right place to set off, the chain sticks and gets stuck in the mechanism of the derailleur.

Now I'm still at the early stages of learning about such mechanicals and am stuck as to what to do to fix this. It certainly didn't do this a month ago I can say that much.

The back derailleur is a Suntour Cyclone and the three photos I've attached show how the two little cogs seem to be almost touching which I think is the cause of this jamming.

Can anyone identify this problem and how to sort it? I'm not completely hopeless at fixing things if I get some instruction but I couldn't find the right words to describe the problem and do a google search for the fix.

Cheers,

Joe