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Merokee Car & Truck Tire Guide
Car & Truck Tires In The News
Michelin Tire Recall
WLNS - Lansing,MI,USA
The France-based tire maker says the recall includes two front motorcycle tire models, the Michelin Pilot Power 2CT and Michelin Pilot Power...
On Your Side: Tire Recall
WJLA - Washington,DC,USA
Jeff Inge/Independent Tire Dealer: "I've seen it completely separate the whole side wall separate from the tread." SIDEWALL CRACKING ON GOODYEAR EAGLE TIRES...
Michelin's Aggressive New LTX(R) A/T2 Light Truck Tire Delivers On...
PR Newswire (press release) - New York,NY,USA
The LTX A/T2 tire incorporates several innovations and features including: -- Off-Road Grip and Styling: With aggressive notched tread blocks and biting...
A Recycled Tire Swing
The Green Guide - New York,NY,USA
Flying through the air on an old tire swing is probably the most fun you'll have recycling. Happily, more than 80 percent of tires are recycled in some way,...
Proper tire-inflation stressed
Charlotte Observer - Charlotte,NC,USA
UNC Charlotte will participate June 7 in Pump 'Em Up, a nationwide effort to promote proper tire-inflation on vehicles as a gasoline-saving measure. ...
Demystifying The Tire Sidewall CodeBy Debbie Pettitt
So, you need new tires for your car or truck, but how do you know what to buy? What do all those alphanumeric codes printed on the tire side walls mean, anyway?
If you're in the market for new tires, you may simply want to replace your worn tires with exactly the same tire it came with. But you MAY want to consider an upgrade. If you know how to read the tire side walls, chock full of valuable information, you've got an advantage over most people and are prepared to make an informed decision. So let's get underway!
Tire Size Markings (example: P215/65R15 89H)
Broken down:
P = Passenger
Other designations are
LT = Light Truck
T = Temporary (spare tire)
215 is the width (in millimeters) of the tire from sidewall to sidewall. A wider tire has more grip but the bad news is that you lose fuel economy, hear more noise and the tires don't work as well in the rain.
65 is the aspect ratio
The aspect ratio is the ratio of sidewall height to tire width. With regards to aspect ratio, the larger the number, the taller the tire sidewall. Tall (60-75) is great for a quiet ride but causes howling in turns. Short (35-55) is better for handling--more for sports cars.
R indicates Radial. This means it is constructed with a series of support belts sideways under the tread.
Other designations include
B for Belted Bias
and
D for Diagonal Bias
The standard, and what you'll see most often, is R.
15 is the wheel (or rim) diameter, in inches.
89 is the load index
H is the speed rating
Speed ratings indicate the top speed under ideal conditions. Higher-rated tires are usually made of softer rubber and will have shorter UTQG tread life. Here are a few of the more common speed ratings: R= 106, S=112, T=118, U=124, H=130, V=149, W=168, Y=186. Along with this speed rating, you have a load index which indicates the approximate weight the tire can carry. Some of the more common load weights are as follows: 85 = 1,135 pounds, 86 = 1,168 pounds, 87 = 1,201 pounds, 88 = 1,235 pounds.
UTQG Ratings
Passenger car tires are accompanied by a UTQG Rating (Uniform Tire Quality Grading, mandated by the Federal Government) which rates the tread life of tires by looking at tread wear, traction and temperature resistance. The UTQG Rating is usually found opposite the tire size markings and will be in three separate ratings: tread wear, traction and temperature.
The reaware grade standard is 100. A grade of 200 means the tread would wear twice as well as a tire graded 100.
Traction grades run from AA to C, with AA being the highest grade and C meaning the tire brakes poorly on both wet concrete and wet asphalt.
Temperature grades rate the tire's resistance to and ability to dispel heat. Those grades are A (resists heat well), B (not as good as A) and C (passes minimum safety standards.) Keep in mind that heavy loads, under-inflation of the tires, and high speeds can all affect the tire temperature.
You should note that these tire grades rate tires measured under controlled conditions. Factors such as driving habits, road conditions, climate, etc., are not considerations and may affect the actual performance of your tire.
DOT
DOT (Department of Transportation) indicates the tire is in compliance with applicable DOT safety standards. Next to DOT is an identification or serial number--codes that designate where and when the tire was produced.
You'll also find other information on the sidewall such as the type and composition of the tire, the maximum cold inflation (PSI) and maximum load in pounds.
So as you can see, tires carry a huge amount of information. But it's really not all that complicated once you learn to read the code.
About the Author: Debbie Pettitt is webmaster for Everything Tires, your tire resource. For more information on tires, visit http://everythingtires.com
Source: www.isnare.com
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