1. Flat tire than
flatness ratio is the ratio of the maximum cross-sectional width and a height measured from the rim to the tread of the tire, i.e., the wall thickness is wider than the tread width of the tire, as a percentage indicate that the percentage of the width of the height. At 205 / 60R15 size tires, for example, the maximum width of the cross section is 205 mm, an inner diameter of the tire 15 inches, flatness ratio of 60.
In general, the current domestic car uses more or less width, and a small inner diameter of the tire a high flatness ratio. Since the flatness ratio of the higher tire sidewall long, strong buffering capacity, relatively high comfort, but the feeling of the road surface is poor, weak lateral resistance during turning. Conversely, lower than the flat, large inner diameter of the tire, because of the shorter sidewalls, tread wide. Therefore, the ground area, the tires can withstand the pressure also big, the road surface reaction is very sensitive, strong lateral resistance when turning, the vehicle handling is greatly enhanced.
The optimum size
Generally, when the vehicle is shipped from the factory equipped with tire manufacturers are selected after repeated testing. If the owner wants to replace the tire size, must be conducted under the guidance of professionals, can not be arbitrary and, because it involves a lot of questions, a little negligence may cause harm to traffic safety. Further, lower than the flat tires appear more “delicate” number, should be more attention and care during use.