I recently have had problems switching to the 11th and 12th gears of my 18 speed mountain bike. A week ago it was fine, but now it won't switch over. Does anyone know what is going on here?
Another problem I have is switching from the the 7-12 speeds to either 1-6 or 13-18. Why is this?
It sounds like there some intelligent people in here when it comes to bikes, unfortunately I am not.