Is there any kind of tutorial you all know of to help me adjust my bike? It seems both shifters are not hitting the full range of gears. I could go to a bike shop and pay for a full tune-up, and I might do that, but I really would like to learn myself. I'm very mechanically inclined and do lots of my own work on my Jeep (engine rebuilds, ring and pinion swaps, etc.), I maintain my own motorcycle, so I hate to spend the money on the shop to tune up my bike for something that is most likely very easy to fix. The bike is a DiamondBack Outlook MTB (probably 10-12 years old). I bought it new but don't remember when, exactly. I do know the frame has no suspension if that make any difference.