Optimal Tire PSI When Running
My ST 215/75R14 Maxxis M8008 tires are set to 50 psi cold in the morning. I know that tire pressure increases roughly 1 psi for every 10* increase in ambient air temp as the day heats up. I also kno...
Forum Discussion
Bruce H. wrote:
Thank you, CapriRacer, I was hoping you would respond.....
Quite welcome.
Bruce H. wrote:
...... I had to read your response 5 times before this non-engineer's mind could perhaps comprehend what you were saying. :)
Let me see if I got it right. After deducting the increase in psi due to increased ambient air temperature, the remaining psi increase should be within 10% of the starting psi, 15% tops. If over that, it is due to too much tire flex, so add air pressure to reduce tire flex and thereby reduce heat and accompanying psi increase due to tire flex.
Hope you will confirm or straighten me out on my layman's interpretation!
Thanks again,
Bruce
You have it exactly right - with one provision.
You need to be aware of the limitations of the tire. So if you have a tire with a maximum allowable pressure of 65 psi, then you should be wary of exceeding that value. You might be able to exceed the max to get you to a place where you can deal with it (say no more than 100 miles), but this should be a MacGyver kind of thing and not to be relied upon.
