e-rated tire pressure

Thanks yeah that makes sense. And that deflator is pretty sweet. If i get into more offroading it would be a handy tool.

The idea was that because C rated tires aren't as stiff i wouldn't need to run as low of pressure. Still confused how the C rated tire weighs the same as E

 

Okay then explain.

 

This has been covered many, many times. Simple example. Take a balloon. Blow it up and put a little water in it. Notice the shape. Spin the same balloon in a circular motion as fast as you can. Notice the new shape. That is what happens with your tires. That is why the chalk test provides you zero scientific information. Do not waste your time trying to use that to determine air pressure.

 

lol i don't even know how to respond to this.

 

https://youtu.be/gln0VweXEKA?t=4

 

28PSI?

I run my e-rated tires at 40PSI...lmao

 

45 on my LC

 

the chalk test does work to a point

 

shit i run my e rated tiers at 23

 

lol

If I was a normal person i'd prob run them somehwere between 28-33. But I came from a WRX, so a bumpy ride was already standard, and I like the firmer handling they provide. My suspension is dialed to the firmest setting and there isn't much weight on it though that's soon to change

 

Damn! yeah when the shop lifted and changed the tires they had them set at 37, leschwab said 33 to 35 and i had tried 40 plus but it felt like a rock. lol. Then when i had a rental car for a month i was like wow its like driving on clouds haha. toyota camry

 

My big wonder with the chalk test is do you do it with cold or hot tires? I have ever found an answer, yet.

I used to race autocross class DSP, though the 1990s, with an '84 Rabbit GTI that I built for that purpose.
How I got to the "correct" tire pressure for the car and ground temperature was to use a point and shoot IR thermometer gun across the tread width and record the temps after a run. You want even temps across the tread. High temps on the sides told me the tire was under-inflated. Hotter in the middle told me the tire was over-inflated.

 

Hmm that would make sense too. I've read about the water method. After the comments on the chalk method i searched around. Since everyone and there mother mentions it. Found this article from interco tires. Theres factors to keep in account and caution plus common sense. From what i read it is supposed to be done hot.
https://www.intercotire.com/using_chalk_method_determining_psi

 

Nowhere do they say to have the tire cold or at operating temps.

FWIW, if you have brand new tires of different sizes, like going from 265-70-16 to 255-85-16, I think the chalk test will get you to a base psi to start.

 

You're going to want to be on a warm tire as that is the condition that the tire will be in when it is wearing.


Of course, there is always the lazy ass method. Just drive and keep an eye on the wear.

I'm stoked that my wear is even at 35psi (SL sidewalls) as lower pressure felt like crap in the corners.

 

Not in their article i never seen the hot vs cold tire, somewhere else. Sorry for the confusion. And yep i bought these in june. Came from 265/70-16 4 ply falken wildpeaks and now have LT285/70/17.

 

I don't even know why you would. If you really think you are gaining any useful information, you are sadly mistaken. You will get just a much information making stick people on your sidewalk.

 

30 psi e rated even wear. For what it’s worth

 

So I guess autocrossers, drag racers, 4wheelers, and even tire companies (https://www.intercotire.com/using_chalk_method_determining_psi) don't know what they're doing by using the chalk method? What do you recommend instead?

 

Haa, you cite the mighty interco! That is hilarious. Please when you can show me Michelin, Pirelli, Goodyear, etc. suggesting such nonsense, I'll eat my words. Look, I really don't feel like explaining something that you are apparently too lazy to find out on your own. Spend a little time doing some research and if you dispute the facts, come on back and I will happily debate them with you, but right now it is painfully obvious that you know nothing about tires. Also, no one in professional motor sports is out chalking their tires. Have you ever seen even a NASCAR team let alone a Formula one team out chalking tires? No. I realize that you clearly didn't pay attention in science class, but I'll help you a little bit here, but do you not understand that as a tire spins it distorts? Assuming that the math would confuse you and your erroneous assertion that drag racers would waste their time chalking tires, may I suggest that you take the time to watch a slo-mo drag race video? Please do that and report back to me what you see, then tell me again how you think they could get any useful information. Don't get me wrong. I am not trying to make you look stupid, but you are the one that jumped in here without knowing what you are talking about then continue to question.