Hounddog409
Well-Known Member
Ok...gotcha.Maybe deform wasn't the best term, perhaps deflection is better. Tires deflect to produce grip by design, and they definitely deflect more than one might assume.
When you do the chalk test, you're only optimizing for parking lot speeds at parking lot temperatures, which is why it's not my favorite method. Now, I do agree that it's better than guessing or waiting, but when there's so many other factors that don't get accounted for in a parking lot chalk test it's hard for me to "swear by it".
Admittedly, there are not many other tire tests that one can do on their own without fancy equipment, so yes, chalk tests are a great place to start. I guess my point is that chalk tests can provide good info only within certain contexts.
The issue is tire manufacturer cannot provide PSI recommendations for every vehicle or application.
Start with the tire recommended PSI.
Chalk to tweek for your vehicle.
This will be good for most of your miles. Agreed not all.
Of course if you tow, haul, etc. This changes what is required for that circumstance.
Its the best we can do, unless you have a bldg full of neat equipment.
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