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-   -   how to read a tire (http://www.focusfanatics.com/forum/showthread.php?t=163568)

Nürsebob-86 06-17-2008 07:41 PM

how to read a tire
 
I know how to read the sizes but how what speeds it can handle.

for ex. what 88t mean it's somthing i seen on a tire.

jetrinka 06-17-2008 07:47 PM

Speed Rating

In Germany some highways do not have speed limits and high speed driving is permitted. Speed ratings were established to match the speed capability of tires with the top speed capability of the vehicles to which they are applied. Speed ratings are established in kilometers per hour and subsequently converted to miles per hour (which explains why speed ratings appear established at "unusual" mile per hour increments). Despite the tire manufacturer's ability to manufacturer tires capable of high speeds, none of them recommend the use of their products in excess of legal speed limits.

Speed ratings are based on laboratory tests where the tire is pressed against a large diameter metal drum to reflect its appropriate load, and run at ever increasing speeds (in 6.2 mph steps in 10 minute increments) until the tire's required speed has been met.

It is important to note that speed ratings only apply to tires that have not been damaged, altered, under-inflated or overloaded. Additionally, most tire manufacturers maintain that a tire that has been cut or punctured no longer retains the tire manufacturer's original speed rating, even after being repaired because the tire manufacturer can't control the quality of the repair.

Over the years, tire speed rating symbols have been marked on tires in any of three ways shown in the following examples:

225/50SR16 225/50SR16 89S or 225/50R16 89S


Each of these was an acceptable method of identifying speed ratings.

Early tires had their speed rating symbol shown "within" the tire size, such as 225/50SR16. Tires using this type of branding were not to have been produced after 1991.

225/50SR16 112 mph, 180 km/h
225/50HR16 130, 210 km/h
225/50VR16 in excess of 130 mph, 210 km/h


Beginning in 1991, the speed symbol denoting a fixed maximum speed capability of new tires must be shown only in the speed rating portion of the tire's service description, such as 225/50R16 89S. The most common tire speed rating symbols, maximum speeds and typical applications are shown below:

M 81 mph 130 km/h
N 87 mph 140km/h Temporary Spare Tires
P 93 mph 150 km/h
Q 99 mph 160 km/h Studless & Studdable Winter Tires
R 106 mph 170 km/h H.D. Light Truck Tires
S 112 mph 180 km/h Family Sedans & Vans
T 118 mph 190 km/h Family Sedans & Vans
U 124 mph 200 km/h
H 130 mph 210 km/h Sport Sedans & Coupes
V 149 mph 240 km/h Sport Sedans, Coupes & Sports Cars


When Z-speed rated tires were first introduced, they were thought to reflect the highest tire speed rating that would ever be required, in excess of 240 km/h or 149 mph. While Z-speed rated tires are capable of speeds in excess of 149 mph, how far above 149 mph was not identified. That ultimately caused the automotive industry to add W- and Y-speed ratings to identify the tires that meet the needs of new vehicles that have extremely high top-speed capabilities.

W 168 mph 270 km/h Exotic Sports Cars
Y 186 mph 300 km/h Exotic Sports Cars


While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed.

225/50ZR16 in excess of 149 mph, 240 km/h
205/45ZR17 88W 168 mph, 270 km/h
285/35ZR19 99Y 186 mph, 300 km/h


Most recently, when the Y-speed rating indicated in a service description is enclosed in parentheses, such as 285/35ZR19 (99Y), the top speed of the tire has been tested in excess of 186 mph, 300 km/h indicated by the service description as shown below:

285/35ZR19 99Y 186 mph, 300 km/h
285/35ZR19 (99Y) in excess of 186 mph, 300 km/h


As vehicles have increased their top speeds into Autobahn-only ranges, the tire speed ratings have evolved to better identify the tires capability, allowing drivers to match the speed of their tires with the top speed of their vehicle.

Cited from Tirerack.com

WeeAsp 06-17-2008 08:04 PM

I'm glad that you asked this question and Jetrinka did a great job of providing the answer.

The important thing to remember is choosing the right speed rating for you.

Speed ratings are primarily an indicator of how well a tire dissipates heat across the carcass of the tire. Heat destroys tires from the inside out.

However, if you do not or your vehicle is not capable of speeds in excess of XXX speed, then do you really NEED the Z rated uber tire?

Chances are you do not.

So, save a few bucks and get the best tire for your needs.

jetrinka 06-17-2008 08:08 PM

Another question for you about speed ratings though. I have heard that the higher the rating the stiffer the sidewall. This for maintaining the hotter air in the tire/strengthen against the rotational force exerted on the tire at high speeds I would guess. But does it also help with turn responsiveness and cornering ability or is this primarily the job of the tread design and compound?

gonzorelic 06-17-2008 08:09 PM

good question. good answer.

Nürsebob-86 06-17-2008 08:59 PM

the stiffer the side wall the better the tire holds up to cornering forces. if it to soft or to thick of a side it can rip off the rim while at high speed turns.

wickedgreyzx3 06-17-2008 10:32 PM

Quote:

Originally Posted by jetrinka (Post 2183105)
Another question for you about speed ratings though. I have heard that the higher the rating the stiffer the sidewall. This for maintaining the hotter air in the tire/strengthen against the rotational force exerted on the tire at high speeds I would guess. But does it also help with turn responsiveness and cornering ability or is this primarily the job of the tread design and compound?

I dunno, michilan has some ZR rated tires with a damn soft side wall.

Geezer 06-18-2008 04:45 PM

Here's some additional info and a good link. The numerals (88 in your example) have to do with the load capacity of the tires.

http://www.tirerack.com/tires/tirete....jsp?techid=35


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