Tire Inflation Guide
Checking your tire pressure is the simplest and most important piece of regular maintenance you can perform.
Use this article to learn more about tire pressure and determine the right tire inflation.
Tire Pressure
Recommended tire pressure will always be printed on the sidewall of each tire. Suggested pressure can be printed as a given maximum (e.g. MAX 60 PSI) or a range (e.g. 80-100 PSI). Even when a range is given, to optimize performance do some testing within that range.
Having the right PSI in bike tires can make a world of difference. However, it would be an oversimplification to say that less air offers a more comfortable ride, and more air makes you go faster. While this is true in many instances, the fact of the matter is that proper inflation for optimal performance depends on the individual rider and their bike.
Overinflation vs. Underinflation
In short, don’t do either. If you overinflate above the recommended PSI, you run the risk of blowing the tube either while pumping or while riding due to sudden or constant impacts. If you underinflate below the recommended PSI, the low pressure could cause pinch flats (Figure 3). Pinch flats occur when the tube becomes squeezed between the rim and tire casing by hitting a bump with an underinflated wheel. Not only does this damage the tire, but it can also hurt the rim. Underinflating can also lead to the tire coming off the rim during hard cornering, as there is not enough air pressure internally to keep it mounted on the rim.
If your tires only state a maximum riding pressure, always start by inflating the tire to its maximum rated pressure, as this is a known safe PSI. Then mount the bike and ride around a little looking at the tire’s shape and profile during use while feeling for the physical performing characteristics as discussed above. Then reduce the tire pressure in increments of 5% and repeat the testing until you feel comfortable. When you first mount the bike if you notice the tire squats (Figure 2) this is an indicator that you are close to the minimum acceptable tire pressure, any lower may increase your chances of a pinch flat or rim damage.
Note that the lower your tire pressure is within the given range, the more often you will need to inflate your tires, as the PSI will reduce over time even when not in use.