Open Question: Why does my mountain bike randomly change gears when I am riding?
When I am riding, especially in gears 6, 7, and 8, they randomly change gears. So when I am standing up and riding, it changes gears and the pedals smack into my leg and I fall farward and crush my chest on my handlebars! It hurts! Does anyone know why it is doing this? I THINK it might have something to do with the barrel adjusters but I am not sure what to do with them, or what they are. So if anyone knows, please can you tell me why and explain what to do? Thanks.