Wider tires may decrease braking distances on dry pavement. Wider tires may also increase acceleration, especially in very powerful vehicles such as muscle cars. The sidewall height is a percentage of the width of the tire, so a 55 series is taller with a wider tire. The 4. When the Z rating was first introduced, it was intended to be the highest rating that would ever be necessary, but as subsequent super cars reached ever-higher levels of performance, the W and Y ratings were added.
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Aspect Ratio. Load Index. Speed Rating. These indicate different purposes. In addition to the tire size, there are other parameters on the tire sidewall as well. A few of them are:. The Vehicle Lab is reader-supported. If you decide to buy through a link on this page, we may earn an affiliate commission. Learn More. By Richard Reed.
Last Updated August 31, Tire size specifications are outlined by the numbers and letters found on the sidewall of tires. I've driven flat beds, reefers, dropdecks, moving vans, heavy machinery, etc. These sizes are intended for use with specific vehicles and should not be combined with traditional tire sizes.
Tire sizes follow the rim diameter with a service description, a code indicating load capacity and speed rating. Please enter the following code:.
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