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Old 03-18-2011, 03:13 PM   #1
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Angry Help new to lifting and regearing

I have a 2002 jeep wrangler tj 4.0 liter inline 6 engine and everything is stock on it.
I want to put 18 in wheels and 31 inch tires on it and was told i need at least a 2 in lift on it, is regearing necessary for this and if so what gears do i need and where can i buy them. the wheels are mamba m2 and i dont know what back spacing i need or if i need wheel spacers. here is the website for them
Mamba Offroad Alloys - Type M2 can you tell me which 18 in wheels are best.
For the tires i was told to go with 265/65R18 can i go 275 with this setup?
Please help as much as possible

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Old 03-18-2011, 03:19 PM   #2
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no comment on the tires/wheels.. but you shouldnt necessarily have to regear. you may just lose a bit of power. if you want to regear, id consider getting it done somewhere. it won't be easy on your own

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Old 03-18-2011, 05:20 PM   #3
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18" rims and 31" tires will look better if you lower 2 inches.
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Old 03-18-2011, 05:25 PM   #4
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Quote:
Originally Posted by benny127 View Post
18" rims and 31" tires will look better if you lower 2 inches.
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Old 03-18-2011, 05:39 PM   #5
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You'll find that most people on here won't be a fan of 18" wheels on 31's. However to each his own. From what I've read you should be fine clearance wise provided you have proper back spacing. As far as gearing goes, I wouldn't mess with it until you get larger diameter tires. I have 33" tires with 15" wheels with stock 3.73 gearing and it is less powerful than it was but bearable. I'm going to regear to 4.56 as soon as I have the money.
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Old 03-18-2011, 06:23 PM   #6
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You do not need a lift to fit 31" tires.
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Old 03-18-2011, 06:24 PM   #7
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You do not need a lift to fit 31" tires.
but with an 18 in wheel and them i do
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Old 03-18-2011, 06:27 PM   #8
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An 18" wheel does not make the 31" tire any taller.
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Old 03-18-2011, 06:40 PM   #9
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General rule of thumb for rims size.. tire size should be double the rim height.. so for an 18 rim you should be running a 36" tall tire to maintain the proper side wall height.
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Old 03-18-2011, 06:45 PM   #10
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Quote:
Originally Posted by squishydanny

but with an 18 in wheel and them i do
18" is the interior diameter of the tire while 31" is the exterior diameter. So a 31x10.5x15 is the same height as 31x10.5x18
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Old 03-18-2011, 07:01 PM   #11
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18" is the interior diameter of the tire while 31" is the exterior diameter. So a 31x10.5x15 is the same height as 31x10.5x18
Someone told me because of the backspacin or somethin to do with the i needed it and/or to prevent rubbing, but if i dont need it then that works, im just tryin to get a very clear understanding of all of this
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Old 03-18-2011, 07:05 PM   #12
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Quote:
Originally Posted by squishydanny

Someone told me because of the backspacin or somethin to do with the i needed it and/or to prevent rubbing, but if i dont need it then that works, im just tryin to get a very clear understanding of all of this
You do need a lift for 31" tires.
16" rims will also be cheaper and not look dumb.
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Old 03-18-2011, 07:35 PM   #13
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From what I have seen, plenty of people have 31" tires with no rubbing issues. If you are disconnected and hardcore rock crawling, okay maybe, but you won't be doing that anyways with 18" wheels and 31" tires. However, depending on the back spacing the tires might rub on the control arms at full lock. There is an easy fix that involves adding washers to the steering stops. But with proper back spacing you should be fine. Those tires are one inch larger than stock.
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Old 03-18-2011, 08:35 PM   #14
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^^My post above was from my phone and incorrect. You do not need a lift to run 31" tires.
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Old 03-19-2011, 02:10 AM   #15
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Quote:
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but with an 18 in wheel and them i do


A 31 inch tire is always going to be a 31". No matter what the rim size.
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Old 03-19-2011, 05:17 AM   #16
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haha is this a troll thread?
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Old 03-19-2011, 09:44 AM   #17
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Old 03-19-2011, 09:48 AM   #18
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The first number stays the same, if your wheel is bigger ( the third # ) than the 2nd number ( side wall # ) is smaller, x 2 plus wheel dia. Equals overall dia. 31 or whatever

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