Street tires vs. off road tires

[strokeZ]

I agree w Doc. Stock tires are around 29" in diameter and if you put 33's on you are running 70 when your speedo reads 65 (or thereabouts). You would need a programmer to correct this and get the calculated mpg correct for the 'puter. Have you done the manual calculation? You would need to use a GPS to get actual miles travelled since the odometer would be off as well (I am assuming you have not re-programmed the vehicle).

Personally, I did not see a very big drop when I installed my 32's. I see huge variances with outside temp, especially over 95 deg F - so make sure that is not impacting your results as well.

[Sal-XK]

Personally, I did not see a very big drop when I installed my 32's. I see huge variances with outside temp, especially over 95 deg F - so make sure that is not impacting your results as well.

I agree the tempt here in NC finally dropped below 90 and the humidity dropped below 100% and my AVG started climbing almost immediately. 32" your running are about 5% error. I did the math once correcting the mileage and such so for me I add 2mpg to my average read out and thats my correction so my dash is displaying 12.6 right now so I add 2 which gives me 14.6MPG. Now that is running with no cargo on slightly hilly roads but mostly open with maybe a couple of stop lights once and a while.

[strokeZ]

Here in TX the temp is still way up there, however I did a road trip last year and averaged 17.8 mpg calculated (gps mileage and actually gallons used) - temp was around 65 deg. Did the same trip a few weeks ago in 95 plus degree heat and averaged 14.6 mpg. Somewhere in the 90's the 4.7L becomes terribly inefficient.

[07JeepXK]

Do you have any pictures off the 33 inch tires installed. Also, what did you have to do to make the 33's fit on a 2 inch lift? I know some of the guys with 4 inch lifts had problems getting 33's to fit properly with some wheel/tire combo's that they went with.

[Sal-XK]

I don't have pictures but I have a video of Romeo at flagpole on my you tube page his are 33's I believe. 295/75/17's I could be wrong but I think thats what size he is running.

[07JeepXK]

I think you got your numbers mixed up a little. A 295/75R17's is equivalent to 34.4 inches tall.

Is romeo still running the 2 inch Old Man Emu lift? I talked to him a while back and he mentioned possibly swapping it out for a 4 inch lift.



BTW.....I accidently hit edit post under your post instead of reply to post, thats why it says your post was edited by me.

[Sal-XK]

Yes I did get those numbers messed up sorry about that 275 not 295 oops. I have 32" tires and going to 33" tires only makes it 1/2 taller over all tire dimension. I looked based on my tire size during flex situation it appears to me that you can get 33" tires on if your willing to bend the pinch weld over and melt and form or cut some plastic out of the way. But if you have no plans of going off road I don't think you will have an issue an just rubbing every now and then. This is just my opinion thats it my next set will be at least 33" tires so I can tell you for sure then LOL. oh yes he is running BFG MT KM1 on MOABs with 1.5" spacers and HD OME lift. Just a side note I think with the spacers you would rub more then without.???????? what do you think