Does Cold Tire psi Need to be Changed on Hot Days

Question:

Hi. If my ST trailer E rated tires are rated at 80psi cold for maximum load, what happens later on a hot day when the tires heat up? They are going to be over the cold inflate of 80psi. Do the tire manufacturers take this above max hot day psi into account when they rate the tires for cold psi inflation? Thanks in advance.

asked by: Terry

Expert Reply:

When someone is referring to a tire being cold, they mean when it is not being used on the road - when it has been sitting still overnight and has cooled down. The 80 psi rating on your tire, like the Kenda Karrier # AM10303, has been tested extensively by the manufacturers before releasing them to the public. This means testing them on hot days.

Since this is the case you will want to inflate the tire to the max psi rating that the manufacturer has stated. Anything more or less will change the way that the tire performs and can cause it to overheat which results in a blowout.

expert reply by: Jon G