35 Toyo MT's on stock wheels chalk test
Thread Starter
JK Enthusiast
Joined: Dec 2007
Posts: 451
Likes: 0
From: Central, IL (Peoria Area)
35 Toyo MT's on stock wheels chalk test
24 psi in what it takes on my JKU to get the full footprint of the Toyo's with stock rubi wheels according to the chalk test. I was surprised it was that low but it is what it is. Started out at 30 psi and kept dropping it 2 psi per test until the pavement was making contact with the full surface of the tire. I'm sure with a wider wheel the psi could be increased. Just thought I'd share the results.
Thread Starter
JK Enthusiast
Joined: Dec 2007
Posts: 451
Likes: 0
From: Central, IL (Peoria Area)
It's a true test to fit each vehicle. That same tire on an F-250 might require 45 psi due to the weight to produce the same results with a chalk test. It drives perfect and rides great. At 30 psi I was running on the center 6 inches of the tire. The pattern widened as the psi dropped until the entire chalk line was making contact with the pavement at 24 psi.
JK Junkie
Joined: Jan 2013
Posts: 3,440
Likes: 0
From: CT
Running a 12.5 on a 8" or in your case a 7.5" affects the contact patch.
It usually requires a lot less pressure to get full tread contact because the tires are ballooned to begin with.
Some tire shops won't even mount a 12.5 on a 8" because the manufacture doesn't recommended it.
9" or 10" for a 12.5"
I hear it from the only shop that will touch my tires.
"You are running the incorrect size wheel" he says.
Uses it as a excuse to not try and get a good balance on my tires.
BS actually :(
It usually requires a lot less pressure to get full tread contact because the tires are ballooned to begin with.
Some tire shops won't even mount a 12.5 on a 8" because the manufacture doesn't recommended it.
9" or 10" for a 12.5"
I hear it from the only shop that will touch my tires.
"You are running the incorrect size wheel" he says.
Uses it as a excuse to not try and get a good balance on my tires.
BS actually :(
Thread Starter
JK Enthusiast
Joined: Dec 2007
Posts: 451
Likes: 0
From: Central, IL (Peoria Area)
Running a 12.5 on a 8" or in your case a 7.5" affects the contact patch.
It usually requires a lot less pressure to get full tread contact because the tires are ballooned to begin with.
Some tire shops won't even mount a 12.5 on a 8" because the manufacture doesn't recommended it.
9" or 10" for a 12.5"
I hear it from the only shop that will touch my tires.
"You are running the incorrect size wheel" he says.
Uses it as a excuse to not try and get a good balance on my tires.
BS actually :(
It usually requires a lot less pressure to get full tread contact because the tires are ballooned to begin with.
Some tire shops won't even mount a 12.5 on a 8" because the manufacture doesn't recommended it.
9" or 10" for a 12.5"
I hear it from the only shop that will touch my tires.
"You are running the incorrect size wheel" he says.
Uses it as a excuse to not try and get a good balance on my tires.
BS actually :(
Trending Topics
Super Moderator
Joined: Jun 2011
Posts: 11,054
Likes: 85
From: Hendersonville, Tennessee
Are you measuring the air pressure when he tires are cold or warm? That number actually doesn't sound too far off. I run 35" trail grapplers on the stock wheels, and cold they are around 25-26.
