Well maybe not so quick...But it should be an easy one for ya.

What size tire is the spare that you put on underneath your bed? You are running about a 35" tire or the eqivalent of that roughly, correct?

Here's my gameplan. Right now, I'm running 315/75s on a 16" rim. My spare is the OEM spare that came with the truck, a 17" rim...(still has the old tire on it).

Now I still have my FX4 OEM rims that I want to throw another set of tires on, equal to the about same height as my current 315/75/16s...

So my question is, what size tires would be equal to (or even slightly smaller) to what I currently have on my truck. It's not a 315/75/17, they don't even make that do they?

I need 4 new and one that holds air so I can throw a full size spare on if I ever get a flat, regardless of whatever wheels I have on, the 16s or 17s...

make sense?

 

I'm thinking its a 315/70/17 but hey Its just a guess

Just wait for wandell

 

yeah its a 315/70/17. Same as a 315/75/16. 35x12.50

 

Youwill need the 315/70/17. It is barely smaller than the other, so you wont notice much of a differance.

 

Awesome, thanks fellas. I knew someone would know the answer... Time to start saving.

 

Yep, they are right.