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Unread 07-23-2013, 01:36 PM   #1
brendanc
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4" lift and wheels and tires question

I am about to redo the lift on my KJ this weekend (provided the parts come in) and in the next 6 months or so, I want to buy new wheels and tires.

The lift will be approx 4" (it's the 4" JBA lift) and I'm wondering what I can get away with. I really like the look of http://www.amazon.com/American-Racin.../dp/B007MH23JU but I don't really know what size tires I can get with this amount of lift.

I've not settled on the wheel, but I'd like to know what size tires I can get with:
  • 15x8
  • 16x8
  • 17x8

Also, how would the (highway) ride change between these 3 sizes?

For reference, I'm currently on the stock 16x7 alloy wheels that come with the 02 Sport. I've got BFG AT/KO's at 235/70R16.

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Unread 07-23-2013, 01:51 PM   #2
tommudd
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You'll have to stay with 245-75-16 unless you want to regear
8 inch wide wheel is too wide stick with 7 inch wide, 4 inches of backspacing
works best

175 each for wheels

less sidewall etc with 17 inch wheels and harder ride
reason for staying with 16s

Oh what lift are you getting and do you have or are you getting the 4.5 UCA's from JBA??
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Unread 07-23-2013, 02:01 PM   #3
brendanc
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I got the gold package from JBA, so 4.5 UCA's, cut CV's, coil overs, bilstein 7100 in rear, etc-- the whole deal.

With that advice I will probably stick to 245/75R16 then. Now I just have to find the right wheel I was hoping to get something in black because the silver wheels just get way too dirty from road grime where I live (DC area) because of the constant state of construction.
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Unread 07-23-2013, 02:08 PM   #4
tommudd
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Don't know what you have now but you'll love the ride of the coilovers for sure!
With 4 inches you can go to 265-75-16s but mileage and power will be way down. When I went to 265-75s it was a couple of weeks before I went to 4.10s, couldn't even use overdrive on flat roads and mileage dropped about 5 miles per gallon
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Unread 07-23-2013, 02:17 PM   #5
brendanc
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Quote:
Originally Posted by tommudd View Post
Don't know what you have now but you'll love the ride of the coilovers for sure!
With 4 inches you can go to 265-75-16s but mileage and power will be way down. When I went to 265-75s it was a couple of weeks before I went to 4.10s, couldn't even use overdrive on flat roads and mileage dropped about 5 miles per gallon
Ah, I have a manual, so I don't what the overdrive equivalent is. I will take your advice though. Unless I regear (unlikely in the near future) I will just stick to the smaller tires. The ride is what's most important to me at this point.
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Unread 07-23-2013, 03:00 PM   #6
tommudd
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Well with a manual you'd lose the ability to use 5th or whatever you're top gear is. You'll be happier with 245-75-16s size wise and power wise than going larger
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Unread 07-23-2013, 03:39 PM   #7
brendanc
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Gotcha. Thanks for all the advice, Mr. Mudd!
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Unread 07-23-2013, 11:34 PM   #8
HuglinSupreme
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Hate to hijack but I've got something related. If he just went with a narrower/taller tire, would he need to regear? Just thinking about the guy that threw on the 215/85/$# with no lift.
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Unread 07-24-2013, 04:58 AM   #9
tommudd
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Quote:
Originally Posted by HuglinSupreme View Post
Hate to hijack but I've got something related. If he just went with a narrower/taller tire, would he need to regear? Just thinking about the guy that threw on the 215/85/$# with no lift.
That tire is 30 inches tall so no need to regear its when you get into ones over 31 inches
Width has nothing to do with it, its the height
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Unread 07-24-2013, 06:25 PM   #10
HuglinSupreme
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Quote:
Originally Posted by tommudd View Post
That tire is 30 inches tall so no need to regear its when you get into ones over 31 inches
Width has nothing to do with it, its the height
Thanks! Magic numbers are under 31"
The baby mobile is about to have surgery.
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Unread 07-25-2013, 01:19 PM   #11
brendanc
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Only reservation I have about going with a thinner tire on bigger wheels is that the ride will suffer.
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Unread 07-25-2013, 01:48 PM   #12
tommudd
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either tire will work really on a 7 inch wide wheel
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Unread 07-25-2013, 04:25 PM   #13
brendanc
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So, I was looking at wheels/tire sizes and now I have more questions.

I did some math:

All tire sizes are for BFG AT/KO

16" Wheel
235/70R16
W = 9.25"
H = 6.476"
Total Height = ~28.952"

245/75R16
W = 9.64"
H = 7.234"
Total Height = ~30.468"

15" wheel
235/75R15
W = 9.25"
H = 6.938"
Total Height = ~28.876"

30x9.5x15 (this is how tirerack lists it)
W = 9.5"
H = ~7.5"
Total Height = ~30"

Do these look right? The reason I'm looking at 15" wheels is because there seem to be a distinct lack of 16x7 in the exact style/color I want. I'm just trying to leave my options as open as possible.

Also, are there any issues I should know about with steel wheels vs alloy?
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Unread 07-25-2013, 10:18 PM   #14
tommudd
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Steel will be heavier in most cases
31-10.50-15 most likely is about 30.5 or so inches tall
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Unread 07-26-2013, 12:21 PM   #15
brendanc
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What issues might I run into if the backspacing on the wheel is 3.76"? I've found a few that I like, with that one difference.
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