Leave the job to professionals. If you don't know what you're doing, you may not only ruin the tire but also risk personal injury. Air pressure . Purchase an accurate pressure gauge as it's impossible to tell how much air is in the tire by looking at it. Don't trust the gauges attached to the air hoses, as they may be inaccurate.
All tires lose air over time.
This is normal, especially in warmer weather. Load carrying limits molded into the tire's sidewall should never be exceeded. Overloading builds up heat which could lead to failure. Road Hazards . Obviously, obstacles in the road should be safely avoided.