I am pretty much new to cycling...This past summer i got a very very gently used old Fuji bike...it is a Fuji Sagres. Not sure exactly how old it is. I participated in two Triathlons last summer. They were awesome and i am completely hooked on them. Before Tri season comes up again i want to help my bike out. What are some good steps to start rebuilding my bike some. I had problems with it shifting into gears on my back tire also and some times when trying to shift into my big ring in the front my chain would come off.