Tire Size Markings
The tire size shown below is P185/60R14 82H. The P represents the car type, Passenger. The 185 represents its section width (tire width in mm). The 60 is the
tires Aspect Ratio (the ratio of the sidewall height to the tread width). The R represents radial tire construction. The 14 represents the rim/wheel size and 82H
represents the load index and speed symbol.
Speed ratings are determined by indoor laboratory testing methods which measure high speed tire durability under controlled test conditions. These test
procedures do not take into account under inflation, tire damage, vehicle characteristics, or road conditions which can lead to sudden tire failure or loss of vehicle
control at much lower speeds than indicated by the tire's speed rating. The validity of using speed rated tires in the U.S. is based on the idea that the tire's top
speed capability must at least equal the vehicle's top speed capability, since it cannot be assumed that the driver will always observe the speed limit. Recently the
speed rating is being referred to as the "performance rating" of the tire, since the higher speed rated tires generally offer improved handling and maneuverability
compared to lower speed rated tires.
Load index indicates the maximum load capacity each tire is designed to support. Like speed ratings, assume near perfect operating conditions to obtain the
ratings listed in the table below.
Uniform Tire Quality Grading (UTQG)
Under UTQG, tires are graded by the manufacturers in three areas; tread wear, traction and temperature resistance.
The tread wear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course.
For example, a tire graded 150 would wear 1.5 times as well on the government course as a tire graded 100. The relative performance of tires depends upon the
actual conditions of their use, and may depart significantly from the norm due to variations in driving habits, vehicle condition, road characteristics, and climate.
The traction grades from highest to lowest are AA, A, B and C. They represent a tire's ability to stop on wet pavement as measured under controlled conditions
on specified government test surfaces of asphalt and concrete. A tire marked "C" may have poor traction performance.
The temperature grades are also A, B and C, representing the tire's resistance to heat generation and its ability to dissipate heat when tested under controlled
conditions on a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life; excessive
temperature can lead to sudden tire failure. The grade C corresponds to a level of performance which all passenger tires must meet under Federal safety laws.
Distance between inside of flanges rounded to nearest 1/2-inch. Ensure that wheel width is proper for tire size you intend to mount on it. All tire sizes have
minimum and maximum wheel width limits. Correct wheel width is about 75% of tire cross section width.
Distance from bead seat to bead seat across diameter of wheel. Must be exactly the same as tire rim diameter. Mounting a tire of one diameter on a wheel of
another diameter can result in violent explosion causing serious injury or even death. Always verify diameter stamped on the wheel and match the tire exactly.
Distance between wheel mounting surface where bolted to hub of drum and centerline of rim. Determines vehicle "track" or distance between tires on each axle.
Wheels with more negative offset than original wheels move outboard on car. Keep the wheel offsets as close to original as possible to avoid steering difficulties
or wheel bearing fatigues. Negative offset on rear increases "track" and may improve stability and handling.
Ply Rating/Load Range
While there is no industry-wide definition of ply rating, truck tires are frequently marked with ply rating and equivalent Load Range. These markings are used to
identify the load and inflation limits of that particular tire, when used in a specific type of service. The table shows the conversion of tire markings.
|Auto Maintenance of Sheboygan LLC
We always use plain facts.
We help "YOU" the customer understand exactly what is being serviced & why.
There is only one way to do things, The right Way.
Proper alignment is essential for optimum performance and maximum tire life. Misalignment in the front
or rear, improperly operating brakes or shock absorbers, bent wheels, worn bushings, and any other
mechanical problems can cause uneven and rapid treadwear. Each of these situations should be
corrected immediately. A bad jolt, such as hitting a pothole, can throw your vehicle out of alignment.
Such an impact can also bend the rim, causing a loss of air pressure and damage to your tires with little
or no visible evidence present.
Sometimes irregular tire wear can be corrected by rotating your tires. Consult your car's owner's
manual, the tire manufacturer, or Auto Maintenance of Sheboygan LLC for the appropriate rotation
pattern for your vehicle.
* We have found that a 6,000mile interval greatly improves tire wear and life *
You may have noticed the small weights placed on the rim of your tire. These weights help the tire and
wheel assembly remain balanced at all speeds. At high speeds a tire that is not balanced properly can
generate severe vibrations. An unbalanced tire and wheel can also lead to irregular treadwear. Some
expensive alloy wheels can be damaged with the use of standard lead weights and may require the use
of a coated weight.
|Ideally, tires should be rotated every 3,000 to 5,000 miles. When this is done consistently, the tires
are more likely to maintain good handling and traction, and deliver maximum tread life. However, it's
important to remember that tire rotation alone cannot guard against rapid or uneven wear if your
vehicle has faulty mechanical parts, or improper tire inflation pressure.