I have an older Trek 4300. I bought it in 04 but I bought it on ebay so I honestly don't know what year it is. It worked just fine when I bought it but I didn't ride it very much for several years. I know the chain needs to be replaced because it is getting a little rusty but there are time when I'm riding and it rides just great and then there are times when I'm riding and the pedals feel like they're skipping. It's hard for me to explain it any better than that. It's a great bike that I was just an idiot and let it go down hill. Anybody that can help I would greatly appreciate.