Quote Originally Posted by GPA View Post
Sue:
I just went and measured the height at 28".
They do seem to be a low profile tire, which would explain the shorter height.
I searched the internet for the tire: Goodyear Fortera Triple Tread 255/55R18, and looks like they must be discontinued; therefore, I could not find specs.
GPA
Quote Originally Posted by GPA View Post
Sue....I thought in your past posts you stated you had no Torsion Bar Crank.....but it looks like you do according to this post?
Is that right?
GPA

I didn't have any TB turns when I first installed the 285/60s on the OEMs.

Then in February '13, I installed aftermarket rims (Borbet 18x8, -2 offset with 265/60s) and that required TB turns and lots and lots of trimming and BFH work. So you're probably reading a post prior to 2/13.

I just plug the size into the Rims-N-Tires calculator for the specs. I'd guess the 29" is with a higher psi or something, but close enough for my purposes.

My truck had 255/55s on when I bought it, yes, shorter than OEM 245/60s.

So follow my logic and see if you think I'm in the right ball park on how i'm doing this - - -

GPA:
255/55 - 28" tall tire ---> 6 TB turns = 33.5" floor to top w/w.


KAT:
285/60 - 31.5" tire ---> ? TB turns = 33.5" (I rounded up to make it easier) floor to top w/w.
My tire is 3.5" taller than GPA's.

6 TB turns accomplishes about 3.5" of lift.

So 3.5" / 6 = roughly .6" per turn

So if I subtract 6 turns (3.5"), floor to top w/w. stock should be 30" (33.5" - 3.5")

But since my tires are 1.9" taller than stock (31.5" vs. 29.6") my "stock" height with the 285/60s should be 1/2" less (1.9"/2), so floor to top w/w = 33"


um, - - - that doesn't sound right --

or maybe I just have to have mechanic crank them back as far as they go and then count 18 turns like jmayer mentioned.