I had tried adjusting everything myself but didn't have much luck. A couple guys I work with that are big into cycling tried to adjust so I could shift gears but same problems with my shifting gears. I actually took it back to walmart and was going to get my money back or exchange it for another brand. The guy at walmart said the guy that assembled the bicycles would look at it for me if I had the bike there before he went to lunch. I brought it in and he spent a few minutes working on it and told me to try it out in the parking lot. He had it shifting perfectly! Good guys at my local Walmart!