So I got a flat yesterday and after fixing it, I was checking everything to see if it works. Turns out being on the low ring at the front and largest sprocket at the back and pedalling backwards makes an odd sound. Not that I would ever do that, especially in my lowest gear, but I was just wondering if this could possibly indicate the rear derailleur is not positioned 100% correctly? It is just the largest sprocket, moving one down and it is already smooth again. Pedalling normally there seem to be no issue at all.

Thanks,
ZHVelo