Chalk Test and Tire Temp for Inflation?

I saw the tire inflation pressure chalk test process and as a mechanical engineer it makes a lot of sense to get a proper weight distribution with one question.
Tire temps obviously change the pressure and running tires are warmer by maybe 50 degrees or ~2psi than parked? Meaning the test is most likely done with a cooler tire than a tire would be "on the road". Should the test results be biased for a few PSI low to account for heat?

I tried searching here for an answer. I am currently running stock size tires so using the door sticker pressure (cold) with a calibrated gauge but considering bigger tires in the near future.

I know nitrogen helps but not very practical for the average owner.

 

10* = ~ 1 PSI

On my SoloII car I always set pressure cold, and as tires heated with passes, lowered accordingly.

Chalk test was useful for sidewall rollover indication, done on 1st pass with ambient tire temps.

 

It’s a useful test even on the stock tire size since different brand/construction of tires could possibly have a different contact patch at a given pressure.
I’ve always done this with cold tires and after they are warmed up I adjust it to that pressure and recheck it.

 

i just put the psi at the most smooth comfortable ride

 

As a mechanical engineer, I think you are overthinking it.

I also think, you know you could log the avg tire pressure once warm from driving.
Then chalk them at the warm temp.
But road surface temps and ambient temps will have to be factored too.

I, as a lazy, not so smart person.
Is just going to chalk test them at a cold psi.
One and done. Close enough, is good enough.



Who am I kidding, I’m not even going to chalk them……

 

Tire chalk tests are heavily flawed. Especially when running wide tires.

People need to accept you won't have perfect edge wear with upsized tires, or E rated tires on light trucks.

You should always set pressures for the lowest temp the tire sees. I "let" my tires drop in pressure when its -15C or colder. I usually set mine for 0C which is freezing point.

Never let a truck tire go below 25psi cold, or 30psi loaded/35psi E rated loaded.

 

people acting like they will be running their tacomas in the indy 500

 

If you are referring to me I disagree. The technique seemed to be tailored to getting the best tire pressure for even wear. At least that's how I interpreted it. My question was a technical inquiry in that vain to get best pressure for even wear and not to run an Indy 500

 

Shit I do t even use chalk. I simply roll thru a wet spot. If the entire tread pattern is on the ground I call it good. I’m betting you’ll fine between 28-32 to be perfect 2psi in a heated up tire won’t make a difference.

 

Chalk tests are flawed, they don’t take into account any of the dynamic forces of rolling down the road…use the stock pressure off the door sticker and convert it to your new tire using a pressure conversion calculator. There is no reason to analyze more than that.

That and contact patches are not typically supposed to be 100% perfectly flat on the ground. A lot of people under inflate the tires trying to reach perfectly flat.