Used in smooth highway pavement is used on bicycles, due to the smooth road dragging lesser, road bike design more considerations, often use high-speed can reduce the wind drag under bending handle, narrower high low air pressure resistance tues, block a high, and the wheel diameter than the average mountaineering suvs because frame and accessories, not like a mountain as necessary to strengthen so often light in weight, riding on a highway when the efficiency is very high. Because it often need to strengthen frame using simple and efficient diamond design, is the most beautiful road car bike.