Clunking and sticking

galaxyboy
galaxyboy Posts: 168
edited May 2009 in Workshop
My chain has started to clunk into top gear on the rear cassette and yesterday while out on a ride the chain stuck twice when changed into the large front ring. I can't get it to do it on the workstand but I am sure it was jamming between the cassette and frame. Is this just due to wear in the chain and cassette or does the rear derailer need adjusting?