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Here are some answers to some frequently asked car tire and psi questions

Automobile tire issues

No tire manufacturer can guarantee the tire mileage for any given tire. This tire wear issue is due to driving habits, conditions, vehicle condition, weather, and the road on which the tire is used. The spare tire may have a life time warranty. Tires should be replaced when thread is worn to 2/32nds of an inch (1.6mm) or less across the thread on the same tire. image

Most tires, used or not, should be replaced within ten years. This is because tires contain waxes and emollients to protect their outer surfaces from ozone and weather. Check the side of the tire for date of manufacturer

When you replacing only two tires, the new tires should be placed on the rear for better grip and water evacuation in wet conditions. Many car dealers will offer a separate tire warranty when purchasing a new car. Remember tire prices can range from $100 to $500 per tire for a normal passenger vehicle.

Tire pressure should be checked when tire is cold - has not been driven. This is because tire pressure will increase as the tire heats up. Please check the side of your tire and vehicle manual for correct pressure. The general tire pressure should be about 32 psi (220 kpa.

Tire Speed Ratings All tire information list here are subject to error or change! See your tire manufacturer.

In addition to run flat tires, there are also pax system and zero pressure tires. One tire manufacturer has a self-supporting zero pressure passenger tire. With these tires you can maneuver the vehicle up to 50 miles ( 80 kilometers) at 55 mph (90 kph) unless specified otherwise even thought the tire has lost all air.

Ratings# Max Km/Hr MPH
M 130 81
N 140 87
P 150 93
O 160 Max 100
R 170 Max 106
S, T, H 180 - 190 - 210 Max 112 - 118 - 130
V, V*, W, Y 240 240+ 270 300 300+ Max 149 149+ 168 -ZR** 186 186+