Tire Question

[Low 89]

Hey there, about to order some tires here, and i was just curious. I plan on running 20x8.5 rims up front and 20x10 rims on back. On the front I'll have 255/40-20's. what size of 40 series tire should i have on the rear so that it is not stretched, and the truck sits level?

Thanks in advance!

 

[1badgmc]

If you go with a wider tire in the rear than the front, but still a 40 series tire, then no matter what you pick, it's going to be a taller tire. The '40' in the tire size is the aspect ratio. The aspect ratio is the height of the sidewall measured as a percentage of the section width. So, in the front, the sidewall is 40% of 255mm and in the rear the sidewall would be 40% of whatever wider width you have.

With that out of the way, if it's a 40-series you want, I would recommend a 295/40, but that 295/40 is about 1.3" taller than a 255/40.

 

[Crash]

295/35R20 will be the same diameter as the 255/40R20, but you better be sitting when you price them.

 

[1badgmc]

295/35R20 will be the same diameter as the 255/40R20, but you better be sitting when you price them.

That's no kidding. Painful.

The 295/40 gives a larger selection and some more palatable prices.

 

[Low 89]

So in other words, sorry I was a bit confused, but if i want the tires to have approximately the same height, up front i should go with a 255/40 and in the back a 295/40?

 

[Crash]

Here, play with this...
http://www.markviii.org/LOD2/tirecalc/tirecalc.html

 

[Low 89]

Here, play with this...
http://www.markviii.org/LOD2/tirecalc/tirecalc.html

Thank you! I could not find that damn thing been lookin for two days!

 

[Bigg G]

Somebody should add that tire caluator as a sticky thread because it's pretty useful .
I'm looking into 18" wheels for the Silvy and could use all the tire info you guys can throw at me.

 

[Low 89]

Somebody should add that tire caluator as a sticky thread because it's pretty useful .
I'm looking into 18" wheels for the Silvy and could use all the tire info you guys can throw at me.

I'm gunna have to agree with making that a sticky.And as far as tire info, simply put, im stupid when it comes to tire/wheel intelligence

As far as my tire situation goes, i found some 275/45-20's. They are about 1.7 inches larger than the 255/40-20's. With the 1.5 inch difference between the two tire widths, would this make my truck sit about level? I'm slightly confused.

 

[1badgmc]

If the rear tires are 1.7" taller than the fronts, then no, it won't sit level unless you lower the rear suspension more.