Bicycles made for time-trial use are designed to be as aerodynamic as possible, even at the expense of degrading handling characteristics and rider comfort. Since riders are on their own, there is no need for fancy maneuvering as there is in a peloton . Tire People usually think that tires are made of rubber. This is understandable, because rubber is all that you can see. The cords , cloth forming the body of the tire, woven between the two beads.
Most modern tires use nylon cords.
The rubber , which covers all the other parts. The rubber on the part that contacts the road is thicker, and is called the tread. A bicycle tire is not airtight by itself, so it uses an inner tube , which is basically a doughnut-shaped rubber balloon. The inner tube has a valve to allow you to blow it up. Tire savers usually attach to the brake center bolt, and are commonly made from recycled spokes.