When you start to ride 26 inch wheel sized bikes (considered the start of adult size bikes), you have to determine which size frame is suitable for you. The frame size is measured from the top of the seat tube to the bottom bracket. Unfortunately, not all manufacturers measure their bikes like this. Some of them measure from the intersection to the seat tube. This can cause some confusion, but if you ask a member of Halfords staff at your local store, they will be able to help you with the problem and find the perfect size bike for you.

REMEMBER! If your bike is too big or too small, it is more difficult to control, increasing the risk of accidents and injury to you and others.