Hi All,
Finally ready to replace the stock 235/75/17 on my 07 Scab 4x4. Was looking to replace the stock 17 inch rims with a set of 18" FX4 rims. Tires will either be 275/70/18 or 285/65/18. The truck has a 3.55 gear. How much of a performance hit will this bring? Also, will a tuner help offset this?

Thanks for any help on this.

DJ

 

You'll be OK going to a 33" tire and a tuner alway's help's.

 

I'll let you know, just ordered a set of Goodyear Wrangler AT/S from walmart. Got them for $169.00 each, thought the deal was really good. I have the factory 255/70/17 with 3.55's.

They should be here next week.

Nitrox

 

Thanks for the responses. I'll be waiting to hear how they work out for you, Nitrox..

Thanks
DJ

 

Well, they are installed ... and I like it !!!

For me the 275's fill out the wheel wells alot better than my old factory 255's. I didn't want the big bubba "balloon" look and the new tires give me the look I was after. I do not feel like I should have went larger.

The funny thing is; all the online tire calculators I used said that when my speedometer reads 65 mph I will acutally be traveling 67.31.

I tried 2 different gps devices; magellan and my droid:

at 35 gps read 36
at 45 gps read 46
at 55 gps read 56
at 62 gps read 63
at 65 gps read 66

I can live with that and I'm not going to take it to the dealership to have it adjusted.

I do not feel any lose of power and the Wrangler AT/S tires do not have much road noise, I would say just a little more than a regular road radial.

Just thought I'd post it up.

It's dark out now, I'll wash the truck tomorrow to get all the road salt and grim off and snap some pics.

Nitrox

 

You could also mess with this if you wanted to try something different.
http://www.miata.net/garage/tirecalc.html
http://ejelta.com/tiresize/index.html?ws17=1

 

If your speedo isn't off any more than that, then that tells you right there you had a very insignificant overall ratio change. I hope you enjoy those tires...I had a set and was the absolute worst set of tires I've ever owned to the point they almost ruined me against GY as a whole...but I love my MTR's,

 

Here is the truck with 255/70/17's from the factory and then with 275/70/17's.







Nitrox

 

Went ahead and ordered the 275/70/18's also. Had them installed and I also like the look. Still need to get it leveled, but looks much better. My speedo seems to be off 4mph at 65. Im moving from original 235/17

dj

 

A programmer can help w/adjusting the MPH. I bought an Edge Evo. and was able to adjust based on tire size and if you ever do a gear swap, that's an option to.

Just FYI.

 

Did go ahead and got a Edge CS. Adjusted for tire size and it worked good. Gonna order a 87 economy & 87 performance tune to go with it

 

will I be able to fit 285/75/r18 on my fx4 if i throw on a 3 inch body lift? will the tires fit is basically what I'm asking.

 

285 75 will rub i believe, a friend of mine has a 2005 fx4 with a 2" i believe, and 295/70's and the rub at full turn

 

2" lift that is not a body lift,

 

Not much of a performance hit. I have screw 6.5 foot bed with 3.55's and went to 285/70/17. Speedo reads 65 and gps reads 67 so not very significant change. Haven't noticed more down shifting. Pics can be seen on profile. No leveling kit and no rub.