Crunching sound when peddling

Hi. In any gear when peddling there is a horrible crunching sound from the bike. It doesn't happen in freewheel, only when peddling. I have checked gear alignment, I have degreased and re-oiled the chain. What could be other points of failure causing this issue?

Hey Charles, I just sent you an email, have a look at it when you get the chance.