Tire Speed Ratings And Their Codes

The significance of Tire Speed Ratings could be summed up basically. Tires are produced to a multitude of specifications that meet, or exceed, certain amounts of performance. While you shop for alternative tires make certain you choose a speed ranked tire that fits youíre driving needs. Naturally, you have to be cautious when driving to not exceed the ranked speed of the tires. As well as bear in mind that despite the fact that tire producers market then sell tires able to high speeds, they don’t condone using their items more than legal speed limits.

Grip Few Things about Tire Speed Ratings!

The codes that are utilized to mark the different tire rankings are understood to be the following, which will assist you to know which type and size you will need no matter the design and style or brand.

1. Tire Type it’s almost common knowledge that you will find different types of tires for different types of cars. The letter P means a passenger tire and LT means an easy truck.

2. Tire Width you should possess the proper tire width to be able to ensure efficient handling, fuel efficiency traction and much more. The rankings provide the tire width in millimeters like a standard type of measurement, with roughly 25.4 millimeters creating 1 inch.

3. Aspect Ratio The word “aspect ratio” can be used to appraise the tire’s height in the mount towards the tread and it is proven like a ratio that’s in comparison towards the width from the tire.

4. Construction your tire’s construction type can also be extremely important, particularly if you have specific needs. For instance, the R means “radial” construction.

5. Rim Diameter Within this situation the diameter refers back to the size the wheel. It is crucial the tires you buy possess the identical diameter of the vehicle’s wheel. Within the example over the 15 signifies a tire that’s 15 inches across.

Ways to determine Tire Speed Ratings!

Speed rankings are determined through lab testing. Basically, it calls for pressing a tire at its appropriate load against a sizable, high-speed metal drum, after which progressively growing running speed before the needed speed rating continues to be arrived at. The chart below lists the Tire Speed Ratings and also the maximum speed for your rating:

miles per hour (km/h)

M: 81 (130)

N: 87 (140)

P: 93 (150)

Q: 99 (160)

R: 106 (170)

S: 112 (180)

T: 118 (190)

U: 124 (200)

H: 130 (210)

V: 149 (240)

W: 168 (270)

Y: 186 (300)

Couple of Instructions:

I. Speed rankings are just effective when tires haven’t been broken, changed in certain fashion, aren’t overloaded and therefore are correctly inflated.

II. When a tire continues to be fixed because of a puncture or any other damage, it no more maintains the initial Tire Speed Ratings.

III. Finally, although speed rankings don’t indicate tire handling abilities, a greater tire Speed Ratings may translate to various handling qualities.

IV. You should understand the handling qualities of the vehicle or truck making the required driving changes to permit the low Tire Speed Ratings.



Whenever you understand how Tire Speed Ratings are measured, it can help you when you’re searching at new tires for sale regarding the space the tread should last under regular, daily driving the temperature resistance with regards to build-up or warmth dissipation and traction that is examined to check sturdiness with regards to stopping on various surface types.

A Little History About Tire Speed Ratings

For anyone who has ever purchased tires, online or from a tire outlet, you might have observed among the many imprints on the tires are the speed ratings. Even though tires are all manufactured from rubber and look alike, they differ greatly in terms of their manufacturers, where they are intended to be used as well the purposes they’re meant for. So what is the importance of tire speed ratings and their meaning on tires? Tire speed ratings are generally used to identify the highest speed a tire can maintain for 10 minutes without being in any form of danger or damage. Tire speed ratings typically indicate the highest speed that tires are able to handle. The system for rating applies to all tires regardless of the manufacturer.

Tire speed ratings have their roots in Germany in the countries world famous superhighway called the autobahn. On this highway, speed limits usually work differently where the top speed in a particular lane is not the maximum speed but rather the motorists driving on the lane cannot go below that speed limit. As such, excessive speeds on the highway were quite normal. However at the time though vehicles could get to very high speeds and were allowed to on the autobahn, the tires were not necessarily manufactured to handle such speeds and could cause serious accidents. This led to tire manufacturers developing various grades of tires to match the speeds as well as to match the types of vehicles which led to the development of the tire speed ratings.

Tire speed ratings normally are denoted using letters of the alphabet from A to Z as the speeds increase though what is normally printed on tires starts from the letter L through to Z. The L speed rating is 120 kilometers per hour and as the letters ascend there is an increase of 10 kilometers per hour, for instance M is 130 kilometers per hour and this goes all the way to the letter V whose speed is 240 kilometers per hour. The tire speed rating for the last letter Z appears on tires whose vehicles can get to speeds of over 240 kilometers per hour.

However the two letters just below Z that is Y and W have a rating that is higher than Z.  During the introduction of Z rating, the vehicles at the time could not attain more than 240 kilometers per hour. Currently though very many cars and more sports cars and exotic cars easily exceed this speed. As such the Y and W ratings got introduced. The W speed rating is 270 kilometers per hour while the top rating is the Y with tires which can sustain speeds of 300 kilometers per hour and over.

As far as vehicle types go, the L rating usually appears on tires for off road and light truck vehicles while the V rating is on sports cars, coupes and sports sedans. Most family sedans and vans have the rating of T, a speed of 190 kilometers per hour. The rating Y is normally on tires for exotic sports cars.

When looking at tire speed ratings, one should remember that ratings are applicable if tires haven’t been damaged in any way, overloaded or not properly inflated. Manufacturers also insist that cut or punctured tires will not have the manufacturers tire speed rating. Buyers should also know that the tire speed ratings usually are done on simulations on tires that are not stressed and not properly inflated. Also when replacing tires, one should get new tires whose tire speed rating is the same as the automobiles original tires or higher.