| The
simplest way to check tread depth is to place a penny into the tread
(Lincoln's head first). If the top of his head remains visible,
the tire needs replacing (less that 1/16").
Having
your tires regularly rotated achieves more uniform wear on each
tire. If no rotation period is specified in your owner's manual,
then the tires should be rotated every 6,000 to 8,000 miles.
If
you get stuck in mud or snow, don't spin the tires to get out. Spinning,
even for a few seconds, can build up heat and damage tires.
Properly
balanced tires and wheels turn with all their weight distributed
equally. Unbalanced tires can result in a vehicle's shimmying (shaking
from side to side) and tramping (hopping up and down).
Cleaning
tires removes foreign substances that can degrade the tires. Remove
the substances from the tires. Soap and water are recommended.
Check
your tires at least once a month for uneven wear and foreign objects
wedged in the tread. A tire that continually needs more air should
be taken off the vehicle and off the wheel and checked thoroughly.
Tips
for Proper Inflation
Purchase an accurate pressure gauge, as it's impossible to tell
how much air is in a tire by looking at it. The gauges attached
to air hoses may not be accurate. It is normal for all tires to
lose air over time.
The
pressure should never be below the recommended pressure listed on
the vehicle placard nor above the maximum branded on the sidewall
of a specific tire under normal driving conditions.
Properly
inflated tires: • Improve vehicle handling •
Reduce braking distances • Lower the risk of hydroplaning
• Decrease tire wear • Improve fuel efficiency
What
to Look for in Choosing a Tire
Buy the correct size tire. The appropriate tire size for your car
can be found in the owner's manual or on a placard located somewhere
in the vehicle. Also, consider the car's original equipment when
purchasing a replacement tire.
Consider
factors such as load-carrying capacity of the tire, as well as traction,
tread wear and temperature grades, also known as the Uniform Tire
quality Grade System.
When
tire shopping, keep in mind that there is a difference between the
lowest price and the best value. As a consumer, finding the highest
quality tire that will fulfill your specific needs at the most competitive
price should be the ultimate goal.
When
purchasing a tire, be sure to fill out and mail the DOT Tire Registration
Card so you can be notified of any product updates.
Uniform
Tire Quality Grade [UTQG]
Each tire manufacturer is responsible for designating the rating
of each of its tires. LT designated light truck tires do not have
UTQG markings. The Uniform Tire Quality Grade offers three key pieces
of information about a tire:
1. Tread wear grades - typically range from 60 to 620 in 20 point
increments. The higher the grade the longer the tread life.
2. Traction grades - indicate a tire's braking performance. A grade
from "AA" to "C" is assigned, with "AA"
signifying the best traction.
3. Temperature grades - represent a tire's ability to withstand
heat under test conditions. Temperature grades are assigned "A"
to "C" with "A" signifying the most resistance
to heat.
Sidewall
Markings
Much of what you need to know about a tire can be found on its sidewall.
Each letter and number of the alphanumeric code found on the sides
of any tire conveys important information, like whether a particular
tire will be compatible with you vehicle. Some size designations
are preceded by a letter indicating the type of service for which
the tire is intended.
DOT
Markings
DOT marking serves as the tire's fingerprint and signifies compliance
with U.S. Department of Transportation Tire Safety Standards. For
example - DOT M5H3 459X 069
The
first two characters, M5, designate the tire's manufacturer and
plant code. The third and fourth characters denote the tire size.
The fifth, sixth, seventh and eight (optional) characters identify
the brand as well as other significant characteristics. The final
three numbers (four beginning in 2000) denote the date the tire
was produced, with the first two indicating the week and the last
number indicating the year (069 indicates the tire was built in
the 6th week of 1999).
How
to Read a Sidewall
Just what do all those letters and numbers on a tire's sidewall
mean anyway? The look like some sort of secret code! Actually that's
not a bad way to think of them. The numbers located on the tire's
sidewall are used by tire manufacturers and the Department of Transportation
(D.O.T.) to convey important information about tire size, speed
rating, maximum load carrying capacity and more. Click here for
more information about the 'Uniform Tire Quality Grading System'. |