OK was going to put this in the mechanic section but figured I would put it here first where there might be people running into a similiar problem. Ok so I have a 2002 Trek 4300 MTB and a 2008 Fuji Newest 3.0. Granted not top of the line but not a walmart special either. So I may have a 1000 miles on the fuji by now and not even close to that on the Trek and I weigh 212 down from 250+. I had shifting issues with the Trek (shifting two up to get one gear) so I replaced the chain and it shifts beautiful but still get skips when I get on it hard up a hill. Now the Fuji is exhibiting the same problems so I will be replacing the chain. Both cassettes are significantly worn, the teeth are looking like a saw blade and the valley looks more like a W.Now the question is has any one else had excessive wear in the chains and cassettes and if so what have you replaced them with and has given you the longest life? Any suggestions are greatly appreciated. Just want to sense of what people have had luck with because as you know every company claims their product is the best.