The general perception is that 21 gears are better than 10 or 15 - and now you can even find bikes with 24 or 28 speeds! The fact is that many of these gears are duplicates. A typical 21 speed bike has 7 gears in the back and 3 in the front to give you 21 in all. The problem is that when you change gears in the front you will usually be in the wrong gear in the back - it's why people are usually riding in the wrong gear. It's confusing. With AutoShift and AutoMax, you'll have 7 high and 7 low gears. A simple twist of the left hand will allow you to select High or Low and AutoShift does the rest! You'll always be in the right gear!