4 tyre pressure and defects

Tire pressure

Tire pressure• Tire pressure should be check monthly.

• Tire pressure should be checked cold.

• For every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi.

• The air pressure in the tire supports the car, make sure that it is the right amount.

• The mileage drops 1% for every 2 pounds under the recommended tire pressure.

Nitrogen in tires

• Nitrogen is a dry inert gas. That means moisture free.

• Nitrogen leaks out of the sidewall three times slower then oxygen.

• Oxygen oxidizes the rubber in the sidewall. Plus the moisture in the air will rust the steel rims.

Proper inflation

Effects of tire pressure Over inflation

Wide tires that are under inflated can also wear in the center

Effects of tire pressure Under inflation

Tire Defects• Separations• Bulges• sidewall separations• tread tearing, chunking• shoulder cracking• Sidewall cracking

• Weather cracking• Breaks in

sidewall/tread• Excessive radial runout– diameter

• Excessive lateral runout– width

• Conicity– not level across tread• cone shaped

Tire Wear

Cupping

Tire Defects

Bulge

Tire Defects

Chunk Outs

Tire Defects

Cracks

Tire Defects, Foreign Objects

Tire Wear Side Wear & Feathering