This may be the wrong forum but as the problem is associated with a loaded touring bike, I have decided to post it here. I recently completed End to End on my Dawes Super Galaxy carrying camping gear,etc. The bike performed well with no major problems except that when going uphill the chain jumps between gears making it dificult to maintain speed. This doesn't happen when the bike is unloaded. I suspect that the frame is bending under the load. Is there anything I can do to prevent this?