Acceptable tire pressure variations

[CaptainVideo]

I’m monitoring tire pressure on a 90 degree day. Tires are Goodyear with suggested pressure of 80 psi. I’m looking at pressures between 87 and 89 after an hour on the interstate. Should I be starting the day at a lower pressure?

[DocBrown]

All tires heat up when on the road. That's why the psi rating says "cold". It takes into account the heat from running on the pavement.

[Eyebolt]

I haven't been doing this long but I notice that my tire pressure goes up about 10psi and then stabilizes. I have read in other threads that this is normal.

[Murff]

Originally Posted by Eyebolt

I haven't been doing this long but I notice that my tire pressure goes up about 10psi and then stabilizes. I have read in other threads that this is normal.

Yes, very normal.

Air the tires up in the morning when it's cool. The pressure will increase as the tires warm up on the highway. Just leave them. The presure will lower when you are stopped and the tires cool.

Murff

[travelingjw]

The key is to set the tire pressure while cold. It is that simple. Tires will gain heat based upon basic friction and temperature on the roadway and weather.

[jimp]

If you have/use a TPMS, there will be variances between the tires (temp & psi) due to the variances in the monitors on each tire themselves, whether cold or rolling down the road. IF it's a significant different (in your opinion), call the maker and discuss it with them to see what they say. Mine vary by a # or two per the monitor/sensors but all are in a range that I'm satisfied with.

[CaptainVideo]

Thanks for all the comments. I should have provided more information. I was using a TPMS for the first time and was trying to figure out how to set the upper limits for tire pressure and temperature. I'd set pressure to +10° above cold pressure. I think I'll change it to +15°.

[rkymntsno]

Originally Posted by CaptainVideo

Thanks for all the comments. I should have provided more information. I was using a TPMS for the first time and was trying to figure out how to set the upper limits for tire pressure and temperature. I'd set pressure to +10° above cold pressure. I think I'll change it to +15°.

I have the EEZ TPMS and they recommend 20% over and 10% under inflated tire pressure alarm and 158 degrees for the temp alarm.

[CaptainVideo]

Thanks! This is what I was looking for and should have asked.

[rkymntsno]

And I have also found out that in hot weather, the tires that are getting direct sunlight will get higher temps than the others.

[RetiredOne]

Just as another point of reference, we use to race years ago in a stock class, and ran standard passenger tires. We would see a temperature climb of between 15 - 20 PSI during the race (and we would start 5 - 8 PSI above the rated sidewall pressures), and even with the hard cornering, the tires handled that abuse.