I was riding my Trek 1100 last weekend uphill and pretty steep, switched gears and it starting missing gears and making noise. Rode it home slowly, took a look at it this weekend, I thought maybe the chain needed to be adjusted or something? I am no mechanic. When I looked it over closely I noticed the middle chainring was bent? It has about a 2 inch section that is bent towards the smaller gear. This redirects the chain towards the other gear down and when I am in the smaller gear, the bent portion catches the chain and pulls it up? How can this happen? With an older bike (1990) SunTour, can this be replaced or fixed? What about cost?
Any advice would be appreciated. Thanks.