2nd October 2019

tirerack

18

What does 91w mean on a tire?

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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.

Regarding this, what is the difference between R and Zr?

What is the difference between R and ZR tyres ? ZR basically means the tyre is adapted for speeds above 149 mph. ZR tyres includes the speed ratings V(149mph), W(168mph) and Y(186mph). Before 1990, the manufacturers used "ZR" to mean high performance tyres before the ratings got refined with W, Y…

What does the R mean on TYRE size?

For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tire's width. The bigger the aspect ratio, the bigger the tire's sidewall will be. Construction. The letter "R" in a tire size stands for Radial, which means the layers run radially across the tire.

What does Zr mean on a tire?

For tires having a maximum speed capability above 240 km/h (149 mph), a “ZR” may appear in the size designation. For tires having a maximum speed capability above 300 km/h (186 mph), a “ZR” must appear in the size designation. Consult the tire manufacturer for maximum speed when there is no service description.

1

What does 102t mean on a tire?

Conversion to miles per hour means an L-rated tire has a maximum speed of 75 mph and a Y-rated tire can be run up to 186 mph. The tire with the 101H index is "H" speed rated to a maximum of 130 mph. The 102T tire has the lower "T" speed rating of 118 mph.

2

What is the treadwear rating on a tire?

Treadwear. The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test track. In theory, this means that a tire with a 200 grade will wear twice as long as a tire with a 100 grade.

3

What is the load rating on Tyres?

Your tyre's load index relates to its maximum carrying capacity (in kg). You'll find the load rating of your tyre on the sidewall, just to the right of the diameter. For example, a tyre with a load index of 91 can carry 615kg of weight.

4

What is a touring tire?

Scott Slemmons, senior sales representative, Maxxis: A touring tire is a premium tire designed to provide longer tread life, combined with a smooth quiet ride. Most touring tires are all-season rated, which provides improved wet and dry road traction.

5

What do the numbers mean on a tire?

Tire Width is the width of the tire measured in millimeters from sidewall to sidewall. The first three-digit number in the tire size refers to the tire width. For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tire's width.

6

What is AA traction grade?

As of 1997, the traction grades from highest to lowest are “AA”,”A”,”B” and “C”. A tire graded “AA” may have relatively better traction performance than a tire graded lower, based on straight-ahead braking tests. The grades do not take into consideration the cornering or turning performance of a tire.

7

What is the 91w on my tire?

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.

8

What does the ZR stand for on tires?

For tires having a maximum speed capability above 240 km/h (149 mph), a “ZR” may appear in the size designation. For tires having a maximum speed capability above 300 km/h (186 mph), a “ZR” must appear in the size designation. Consult the tire manufacturer for maximum speed when there is no service description.

9

What does the H on a tire mean?

If there is a "P" on the sidewall, it stands for "passenger car." This refers to the U.S. (P-metric) method of tire sizing. "LT" stands for Light Truck, "ST" is for Special Trailer and "T" stands for Temporary, which is primarily used for small spare tires.

10

How do tire sizes work?

The two-digit number after the slash mark in a tire size is the aspect ratio. For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tire's width. The bigger the aspect ratio, the bigger the tire's sidewall will be.

11

What does the T or H mean on tires?

Speed Rating V. Once the highest speed rating a tire could have, “V” used to represent a maximum of 149 mph (240 kph) or more. Nowadays, it means 149 mph but no higher.

12

What is the UTQG rating on a tire?

The UTQG rating system originated in the US as a way to help consumers make more informed tire-buying decisions. Tire manufacturers give their own tires a grade for treadwear, traction and temperature. Together, these numbers makes up a tire's UTQG rating—a three-digit number plus two letters.

13

How do you read a tire?

A European metric tire would have no letter before the tire size.

245 = Section Width. Tread (mm) The section width is the width of the tire from one sidewall to the other measured in millimeters.
45 = Aspect Ratio. (Ratio of Sidewall height to width)
19 = Wheel. Diameter.
98 = Load. Index.

14

What is a good treadwear number?

Treadwear – The Treadwear rating (on the sidewall and the new tire sticker) is a number; the larger the number the longer the tire will last. The Treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course.

15

What is the longest lasting tire?

Michelin was a standout in our latest tests. The three Michelin models we rated all met or exceeded their mileage warranty. But the longest-wearing tire came from Pirelli. We estimate that the Pirelli P4 FOUR SEASONS Plus could last a whopping 100,000 miles.

16

How many miles are tires supposed to last?

We would expect at least 50,000 miles from the tires that come with any new vehicle, but tire life depends on many factors. Here are some broad guidelines.

17

How long should tires last on a brand new car?

If you drive a typical number of miles, somewhere around 12,000-15,000 miles annually, a tire's tread will wear out in three to four years, long before the rubber compound does. But if you only drive 6,000 miles a year, or have a car that you only drive on weekends, aging tires could be an issue.

18

How do you know if your tires need to be replaced?

A super-easy way to check your tire tread. With President Lincoln's head pointed down, insert a penny into the grooves on your tire tread. If any part of Lincoln's head is hidden by the tire tread, your tires are fine. Otherwise, your treads are too shallow and it's time to replace your tires.

19

Do low profile tires wear out faster?

Faster Wear. As any performance or sport tires, low-profiles provide better grip at the cost of faster wear. The reason is that sporty tires have softer compounds in them that improve traction. Such rubber wears out quickly, leaving more elements on the road.

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