TIRE PRESSURE
As we are now into the colder months of the year I  thought it appropriate to post a reminder about tire pressures and the effect of temperature on the same.
Stamped on the outside of many of your tires ia a recommended tire pressure range.(at least the an upper limit) For longest tire life it is my recommendation that you strive to keep them at the higher limit of those recommendations ( reguardless of what your motorcycle owners manual might say to the contrary.) Futher this pressure should be determined while the tires are cold-meaning, have not been used for a couple of hours.
Time and outside temperature effect the pressure within your tires. It is normal for a tire to lose about 1 PSI per month. Outside temperatures affect your tire pressure far more profoundly, however. A tire's pressure can change by 1 PSI for every 10 degrees Fahrenheit of temperature change. As the temperature goes, so goes the pressure.
Foe example, if a tire is found to have 38 PSI on an 80 degree day, it could lose enough air to have a pressure of 26 PSI on a 20 degree day six months later. This represents a loss of 6 PSI over six months and an additional loss of 6 PSI due to the 60 degree temp reduction.
At 26 PSI your tire is seberely under inflated and Dangerous!!
There is nothing wrong with your tire if it  behaves like the, of course. What is being illustrated here is that you MUST check your tire pressure on a regular basis (about once a week is reasonable) and be particularly aware on cold days.

by James R. Davis