Express Auto Tyre Service

Tyre size simplified

P 205/55 R 16 91S
Here's what that means.
P denotes a Passenger or P-metric tire built to U.S. standards. A light truck tire will be denoted as LT, while European-standard tires won't have this prefix letter at all.
205 — This is the section width of the tread, from sidewall to sidewall. In this case, the tire's section width is 205 millimeters.
55 — This two-digit number is the aspect ratio. Aspect is the height of the sidewall expressed as a percentage of the section width; in this case, the sidewall's height is 65 percent the width of the section width.
R — Radial construction
16 — Fits on a 15-inch rim.
91 — This is your tire's load index. Load index is a code that indicates how many pounds a tire can carry at a given inflation level. In this instance, a load index of 91 would mean that tire is capable of carrying 1,389 pounds at 36 psi inflation.
S — this indicates the speed rating. Speed rating is the highest speed a tire can safely handle, determined through lab testing. In this case, an s-rated tire is good for speeds up to 112 mph.

Fact: While a tyre's tread pattern plays a key part in appearance, its major role is actually to discharge water on wet surfaces.

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