Tire pressure should be checked monthly when cold and adjusted according to temperature, as it can affect mileage. Nitrogen is better than oxygen in tires as it leaks out more slowly and prevents rust and oxidation of rubber and steel. Proper inflation prevents uneven and accelerated tire wear from under or over inflation. Tire defects like separations, bulges, cracks or tears can cause safety issues and should be addressed.

1. Tire pressure

2. 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.

3. 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.

4. Proper inflation

5. Effects of tire pressure Over
inflation
Wide tires that are under inflated can also wear in the center

6. Effects of tire pressure
Under inflation

7. 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

8. Tire Wear

9. Cupping

10. Tire Defects

11. Bulge

12. Tire Defects

13. Chunk Outs

14. Tire Defects

15. Cracks

16. Tire Defects, Foreign Objects

17. Tire Wear
Side Wear & Feathering