What Do Tyre Speed Ratings Mean?
April 01, 2016 at 9:46 AM
CHOOSING YOUR SPEED RATING
The many available brands, models, specifications and ratings can sometimes be confusing when choosing what tyres to purchase for your vehicle. At Dowleys, we want to make the purchasing and fitting of your new tyres as simple and pain-free as possible. I
Every tyre has a series of numbers and letters on the outer wall (called the sidewall). At the end of the number which displays your tyre’s size and load rating, a letter denotes the tyre’s speed rating. This will look something like the following: 255/40/R18 91 Z
The “Z” is the tyre’s speed rating, denoting a tyre that is capable of 150+ mph.
The full breakdown of the example tyres size and ratings is as follows:
255 = 255mm wide tyre
40 = A sidewall size that is 40% of the tyre width (255 x 45% = 90mm)
R18 = A tyre that fits wheels that are 18 inches in diameter
91 = A load rating of 615KG
Z = A speed rating of 150+ mph
WHICH SPEED RATING DO I CHOOSE?
When choosing a tyre speed rating for your car, it is best to follow your car manufacturer's recommendations. Your vehicle’s top speed must fall within your chosen tyres speed rating. For example, if your car’s top speed is 125mph, you will need to choose a minimum tyre speed rating of H (130mph).
All of the available tyre speed ratings are as follows:
N – 87 mph
P – 93 mph
Q – 99 mph
R – 10 6mph
S – 112 mph
T – 118 mph
U – 124 mph
H – 130 mph
V – 149 mph
Z – 150+ mph
W – 168 mph
Y – 186 mph
HOW DO I FIND MY CAR’S SUGGESTED TYRE SPEED RATING?
Providing your car’s existing tyres are correct, you can check the sidewall of your tyres to find the required size and speed rating. Alternatively, you can call/email us and we’d be happy to help you find the correct tyre for your car!
We stock tyres from all of the major brands to accommodate all budgets and to help you even further we are currently offering 4 tyres for the price of 3 across the range. For more information, please contact us.
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