A dynamic-looking bike design. When you look at a bicycle, it's easy to see that the frame is the most important part of this vehicle. Not only is the frame the one that holds the entire bike up and together and allows you to sit on and steer it, but it also attests to the quality of the materials used. A frame can often be the defining factor in whether or not a bicycle will win you a race, keep you comfortable, or get you from point A to point B safely.