Rim size to get 31's

I had the truck lifted with spacer in front and add a leaf in the back and put 29" tires on it a few years ago and now need new tires. I've been reading this forum and see that I can put 31" tires on the truck with no problems. I believe I will need bigger rims to do this. What is the rim size that I will need? and thanks for your help

 

I have 265/70/17's (almost 32's) on 17x8.5's. they fit great with no lift. I did install 5100's at 1.75 lift, buy only to level the truck out.

[/url] Untitled by gatoslayer, on Flickr[/IMG][/IMG]

 

keep your rims. if they are 16s, then you want 265/75/16

if you have 17s, then you want 265/70/17.

both come out to a little less than 32". a select few manufacturers make a 255/85/16 which puts you up to around 33"

 

I've got 16's, as well. Fit perfectly with no rubbing at all.