Tire Speed Rating

What is tire speed rating?

A tire’s speed rating indicates the optimal speed that the tire can safely maintain over time. The higher the speed rating, the better control and handling you’ll have at higher speeds.

The speed rating system was developed to help control the safe performance of tires at standardized speeds. A tire’s certified speed rating is given a letter from A to Z, ranging from 5 km/h (3mph) to above 300 km/h (186 mph).

This rating system (see below) shows the top speed for which a tire is certified. It does not indicate the total performance capability of a tire.

Speeding through the years

When the speed rating system was developed, the "Unlimited V" category of over 210 km/h (130 mph) was the top speed rating possible.

As manufacturers developed bigger and better tires, it became necessary to regulate performance at standardized speeds to ensure safety. The "Limited V" category of 250 km/h (149 mph) was then created, and eventually the "Z" speed rating was added as the top speed rating. (Always consult the manufacturer for the maximum speed of Unlimited Z tires.)

Tire Description

More recently, standardization has changed so all ratings except "Unlimited ZR" incorporate the speed symbol and load index as part of every tire’s service description. For example:

TIRE DESCRIPTION

205/60R15 91V
205 = Section Width in Millimeters
60 = Aspect Ration
R = Radial Construction
15 = Rim diameter in Inches
91 = Load Index Service Description
V = Speed Symbol

ZR Designation

When "ZR" appears in the size designation with the service description, the maximum speed is indicated by the service description. For example:

ZR DESIGNATION

EXAMPLES
Tire Designation Maximum Speed
P275/40ZR17 93W 270 km/h (168 mph)
P275/40ZR17 93Y 300 km/h (186 mph)

Tire Speed Capabilities

For tires with a maximum speed capability higher than 240 km/h (149 mph), a "ZR" may appear in the size designation. Tires with a maximum speed capability higher than 300 km/h (186 mph), require a "ZR" in the size designation. Consult the tire manufacturer for maximum speed when there is no service description.

TIRE SPEED CAPABILITIES

SPEED SYMBOLS
Symbol Speed Speed (km/h) Speed (mph)
A1 5 3
A2 10 6
A3 15 9
A4 20 12
A5 25 16
A6 30 19
A8 40 25
B 50 31
C 60 37
D 65 40
E 70 43
F 80 50
G 90 56
J 100 62
K 110 68
L 120 75
M 130 81
N 140 87
P 150 94
Q 160 100
R 170 106
S 180 112
T 190 118
U 200 124
H 210 130
V 240 149
W 270 168
Y 300 186

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