In reality, I could have dropped the psi a bit to account for the increase but to be honest I thought more about the heat of my body than the temperature of the air in my tires. I’ve ridden at 110 degrees Fahrenheit after leaving a house that was 70 degrees Fahrenheit. The opposite is true if you plan to raise the temperature to an extreme after you start your ride. If however, you are going to experience an extreme drop in temperature you may want to leave your bike and pump outside for a while before you pump your tires up or add a few psi for the upcoming change. This is especially true if the ambient temperature where you pump your tires up is close to the ambient temperature where you are riding. Psia is absolute pressure, which means it is gauge pressure + 14.7 psi. Ultimately, I don’t think that you really have to worry about tire pressure and temperature changes. Psig is equal to psis at sea level (14.7 psi). Ultimately, the temperature effect is not nearly as dramatic as many might think. It is true that the mechanical friction will raise the tire pressure and eliminate some of the drop. If you plan to ride on a winter’s day but store your bike inside your house, you may experience a drop in tire pressure when you go outside. A car before the sun breaks in the morning that has been sitting overnight is a good example of cold tire pressure. Cold tire pressure means that the tire has not been ridden and has been sitting for a while. When you read a recommended tire pressure from a manufacturer, what does this mean? The tire pressure recommendations are “cold inflation pressures”. Tire Pressure Recommendations and “Cold Tire Pressure”
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