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Old 12-03-2012, 08:39 AM   #1
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Biggest tire possible?

Well.. I have the 2.5l and I'm in need of new tires. Currently with my 31.5" I can't use 5th and top out at 65. My tire tread is aggressive though. Any suggestions? I was thinkin 33" trail grapplers, if it can push them.. Ideas?

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Old 12-03-2012, 08:43 AM   #2
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Well if you don't have sagging springs you can put 33s on and NOT do anything offroad. But there's a guy at work that has 33s on his stock jeep and there is about 3 inches only clearance between tires and flares. So I wouldnt do it.. id stay with 31s pelt get a small lift

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Old 12-03-2012, 09:17 AM   #3
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Are you regeared for the 31s?

Do you have a lift of any type?
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Old 12-03-2012, 10:56 AM   #4
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If your hurting with 31's and cant use 5th or do 65+ mph why would going to 33"s be better?
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Old 12-03-2012, 11:14 AM   #5
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2.5 inch body lift and 2 inch suspension lift
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Old 12-03-2012, 11:15 AM   #6
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Quote:
Originally Posted by TJspeed
If your hurting with 31's and cant use 5th or do 65+ mph why would going to 33"s be better?
I was thinking taller tires and less width tire. The width sticks out about 3 inches.. Would narrower and less aggressive tread be better and a taller tire?
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Old 12-03-2012, 11:16 AM   #7
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No regear yet
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Old 12-03-2012, 11:16 AM   #8
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Your backspacing on wheels would probably help that also.
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Old 12-03-2012, 11:18 AM   #9
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Quote:
Originally Posted by dixau11 View Post
I was thinking taller tires and less width tire. The width sticks out about 3 inches.. Would narrower and less aggressive tread be better and a taller tire?
Lol no. Bigger tires weigh more, and the circumference of the tire is larger which means harder to push. Regear.

If you think about how gears work, you will understand why it's not the tread pattern or the width.
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Old 12-03-2012, 11:19 AM   #10
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No regear yet
This is your issue with not using 5th and top out speed. Going up in tire diameter is going to have a reverse effect. You need to regear your diffs to try and get back the stock performance with the larger tires.
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Old 12-03-2012, 11:24 AM   #11
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Quote:
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I was thinking taller tires and less width tire. The width sticks out about 3 inches.. Would narrower and less aggressive tread be better and a taller tire?
Width doesnt matter as much as the diameter does. Even with my 4.0 I went from 31x10.5 "looked like drag slicks they where so bald" to 33x10.5 BFG KM2 and I noticed a difference. A taller tire is only going to make it worse. You need smaller tires or re-gear
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Old 12-03-2012, 11:31 AM   #12
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What about more rim, less tire on a 33" like 17 or18" rims,
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Old 12-03-2012, 11:34 AM   #13
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What about more rim, less tire on a 33" like 17 or18" rims,
Just stick with 31's....

Unless you like cruising in 3rd gear on the highway. Seriously dude, there is no way around regearing with a bigger tire.
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Old 12-03-2012, 11:38 AM   #14
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What about more rim, less tire on a 33" like 17 or18" rims,
Diameter..... doesn't matter how big or small the wheel is... a 33'' tire on a 15" or 20" rim is still a 33'' tire with the same diameter.... And a TJ should never see a 17" or 18" rim... Just my 2 cents on that.
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Old 12-03-2012, 11:40 AM   #15
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What about more rim, less tire on a 33" like 17 or18" rims,
Rims don't matter. If you get get in 5th with 31's, you are going to have a hard time in 4th with 33's.

If you want to run big tires on a 2.5 - regear.
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Old 12-03-2012, 11:41 AM   #16
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The farther away the tire tread is from the center of the wheel the more leverage it has= more power needed to spin the tires.

Your thinking weight is whats causing your issues when its not.
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Old 12-03-2012, 06:17 PM   #17
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Ok... Well I want 33"s how big of deal is it to regear? And cost? I could do it myself I'm sure
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Old 12-03-2012, 06:27 PM   #18
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Ok... Well I want 33"s how big of deal is it to regear? And cost? I could do it myself I'm sure
Regearing is a pretty big deal. Its in the ~$1200 range or so to get it done. You can't really do it yourself, its sort of an art that takes trained mechanics with years of experience to do correctly.
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Old 12-03-2012, 07:22 PM   #19
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Originally Posted by 29JeepTJ09

Regearing is a pretty big deal. Its in the ~$1200 range or so to get it done. You can't really do it yourself, its sort of an art that takes trained mechanics with years of experience to do correctly.
Really... Wow... I mean.. I have an in ground lift and team of people.. What all needs changed! 1200 is a ton...
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Old 12-03-2012, 07:34 PM   #20
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Quote:
Originally Posted by dixau11

Really... Wow... I mean.. I have an in ground lift and team of people.. What all needs changed! 1200 is a ton...
500 to 600 dollars of that is parts. Guys charge about 300 to 400 in labor per axle. I have helped do all my mustangs and I have set up back lash on my own and its still an intimidating job. But it's not impossible.
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Old 12-03-2012, 07:39 PM   #21
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Quote:
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Really... Wow... I mean.. I have an in ground lift and team of people.. What all needs changed! 1200 is a ton...
Tell me about it. It's been a long road trying to save up to get my own done. It's not the parts, it's the labor that's the most expensive part. I takes quite a bit of experience to set the backlash and do the shims right.
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Old 12-03-2012, 07:49 PM   #22
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Tell me about it. It's been a long road trying to save up to get my own done. It's not the parts, it's the labor that's the most expensive part. I takes quite a bit of experience to set the backlash and do the shims right.
So with my 2.5l 5 speed, running 33" what is the ideal gears to get highway speeds at normal rpm and 5th gear back? I know a guy who would gear it for free for me.. 500 isn't too bad
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Old 12-03-2012, 08:00 PM   #23
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Quote:
Originally Posted by dixau11

So with my 2.5l 5 speed, running 33" what is the ideal gears to get highway speeds at normal rpm and 5th gear back? I know a guy who would gear it for free for me.. 500 isn't too bad
If I were you with the 2.5 I would just go right to 4.88. That's the lowest gear ratio you can go in the Dana 30.
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Old 12-03-2012, 08:01 PM   #24
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If I were you with the 2.5 I would just go right to 4.88. That's the lowest gear ratio you can go in the Dana 30.
So that would get me normal function?
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Old 12-03-2012, 08:09 PM   #25
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Originally Posted by dixau11

So that would get me normal function?
It should with the 33's. would be a bit low for the 31's.
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Old 12-03-2012, 10:02 PM   #26
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It should with the 33's. would be a bit low for the 31's.
Maybe I'll just get 32"s and be golden! Lol

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