dillfer

hey just wondering what the biggest tires I could go with 17 inch rims and no lift on a JK 4 door. Just got the thing and dont know if I want to lift it yet.

Graydog

https://www.jk-forum.com/forums/modified-jk-tech-2/modified-tech-faq-answers-questions-every-newbie-has-18617/

DFW Rusty

There is a ton of guys on this forum running 33's with no lift. I dont know what that number would break down as, maybe like a 290/75/17 or something like that.

NE Wrangling

32" if you want the dealer to be able to recalibrate your speedometer.

34" I believe but you will need an aftermarket programmerto adjust the speedometer.

dillfer

Thanks for the responses. Just bought my JK about a week ago and am stoked about getting started on the personalization of it. I've had a few tell me that I can only go with a 265 65 17 without at least a small lift, good to know that I should be able to go a little bigger.

deanthemachine04

285 or 305 as the first number on the tire is equivalent to a 33 fyi.

tambil68

Here is an easy to use formula for calculating tire size form metric to inches

Tires converstion equation..PXXX/YYRZZ equals (((XXX/25.6)*0.YY)*2)+ZZ
eg, p255/75R17 = (255/25.6)*.75)*2)+17=31.94

A BB or budget boost is very inexpensive and can allow a few more options for you when it comes to tire size.

Welcome to the club!

dillfer

Thanks Tambil,
That does clear up some confusion. It seems like tire sizes should be a little bit easier to understand.