CHALK this OUT | Chalk Test for Finding Your Correct Tire Pressure
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- Опубліковано 20 жов 2024
- In this video we learn about using chalk to find the correct tire pressure once you go away from factory tires.
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That's the best thing I've seen about tire PSI. Thanks for sharing 👍
You are welcome. Thank you for watching and the kind feedback.
Good informative video. Thanks Tim!
Thank you for watching and the kind words.
I'm no tire pro or anything but I do have a set of 37x12.50R17 BFG KM3's on my JLUR. I did the chalk test and had to use a lower pressure to get them to evenly wear the chalk. then after a couple thousand miles I noticed they were wearing uneven and feathering the lugs. I ended up raising the pressure back up to 36 psi. That fixed the wear issue. They wear much more evenly now. I think that tire being crowned the way it is is designed to ride heavier towards the middle of the tread pattern. In my experience anyway. Nice video and very thorough tutorial on testing using the chalk method.
Thank you for watching and the kind words. Thank you for the feedback. I am wondering if it changed the wear pattern at temperature after driving. I would love to have some 37x12.50x17 KM3s on mine.
@@timthetrailman4563 I'm not sure. That is a cold pressure. I just know using the chalk test at 36 psi mine seem to wear the chalk more in the center. That being said, they have worn more evenly since at that pressure. I think the tires size you're using look great on the Forerunner!
@@nchighwayman thank you. The 285s do fit nicely without too much work on the 4runner. A ton of work would be needed to get to a 37.
Thank you for doing this for me. Now I know to put my psi at 32 and I won't need to do the chalk test myself. 🤣😂
It is your tires and check book. I would not trust a struggling UA-camr. Lol
@@timthetrailman4563 def learned a thing or two here and it was a nice short vid. thanks!
@@coffeetruckco thank you for watching and the kind words.
What about at high speeds? Wouldn’t the shape of the tire change a little bit?
It definitely could as well as temperature affecting the PSI. In a 4runner I don't really think of high speeds. Lol
Should I do this with the tires at temperature rather than cold? Knowing that the tire pressure will increase when driven
Set tire pressures when cold. They will change as you drive. They will even be different if one side is in the sun and the other side in the shade and will also change cold pressures just as the day will warm up.
I pay attention to my like an ocd psycho. You’re tire psi will have a delta od 3-4psi as it warms up. So for example if you start at 32psi @55F in the morning and drive it for a while in the afternoon, your psi will be around 35psi @85F (actual data from my tires on my 4R). It’s even worst in the summers of Texas when it’s 70F in the morning at 120F in the afternoon (tire temp). In the summer, my delta will swing 5-8psi.
Nitrogen will greatly decrease the temp/psi delta (thank you Costco).
Great idea! Gonna try this in the spring (can't do it in Canadian winter). Also, I pumped my tires to 32 psi but as I drive the tires warm up and then it goes up to 36 psi. Is there a preferred range for this?
Air pressures are supposed to be set when they are cold. I do think there is a strong argument to set when they are hot. Of course each day's temperatures effect all of it. I like to monitor my tires wear and rotate often. Then of course each time you drive load will effect it too. Not an easy question to answer.
Thanks, yes a tricky problem.@@timthetrailman4563
32 psi is what the engineers designed it for. 😂😂😂
@rockeye it worked out perfectly this time. All that work for nothing.
OEM Specs
OEM specs are great on vehicles that are still at the OEM specs they were built. I do that for my other cars.
What do you do when the weight is different then OEM, or the tires are not of OEM size or construction?
@@timthetrailman4563 You basically dropped your pressure to OEM specs, so that's why I said that.
@RedDevilTuning that makes sense. I am sorry for misunderstanding. It was quite surprising to me that it was still at OEM pressure with load range E tires.
@@timthetrailman4563 Me too, I seen some even claim theirs needed 40 PSI to 42