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Unread 02-04-2012, 12:17 PM   #1
Shanker67
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1999 XJ Cherokee 
 
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need rim/tire size advice

I'm applying a 3 inch Rusty's lidft to my 99 XJ soon, gonna keep my stock tires and stuff till they wear down, but i wanted to know what size rims and tires would fit, i'm not looking to get gigantic tires, i dont do any ridiculous offroading or anything, im just gonna get some V5's and BFG A/T's.

Right now ive got the stock 15 in rims and 235/75R15's on it

Recommendations?

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Unread 02-04-2012, 12:19 PM   #2
squirlgod
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get some 30x9.5x15s That will fill the space nicley, give you a little more clearance, but not rub. Also as far as rims go, with that tire size you can either keep the stockers, or get some 15x8s with the 5x4.5 bolt pattern.
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Unread 02-04-2012, 01:26 PM   #3
Durt_Diver
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get 31's. that is the recommended tire size for the lift. dont go lower than 4.5" of backspacing, less chance of rubbing.
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Unread 02-07-2012, 12:41 PM   #4
Shanker67
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okay cool, yeah i was gonna get some cragar V-5's 16 inch, so i guess i could go with a 31x9x16? and just 16x8 rims 4.5? would that work? ihate sizing up this stuff haha, i dont want it to rub at all
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Unread 02-07-2012, 12:46 PM   #5
Shanker67
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all the tires on the site i go through use the "255/75/R16" method, the first and number can be easily converted, buit what about the second? what does 9 or 9.5 mean?
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Unread 02-07-2012, 05:05 PM   #6
CKjeep84
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second number tells you how wide the tire is. if you are going to get 30's they would prob be 30/9.5/r15 or r16
i think most 31" tires are 10 or 10.5" wide so you would see that as 31/10.5/r15. most tire sites have a tire size conversion chart or calculator
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Unread 02-08-2012, 06:56 AM   #7
Shanker67
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oh i was gonan say cause the 255/75/15 is width/profile/rim size, i guess i jsut assumed the 31/9.5/15 was the same....WHY CANT ANYTHING BE UNIVERSAL haha....

i'll try to find that conversion calc
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Unread 02-08-2012, 06:58 AM   #8
Shanker67
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okay found the tires now..... 30/9.5/15....so the rim i select would be a 15x8? what backspacing is good? i saw "dont go lower than 4.5" isn't 4.5 the stock spacing? so would that work?

15x8x4.5?
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Unread 02-08-2012, 03:03 PM   #9
JeepXJMike20
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if your going 30x9.50 get 15x7 4" backspacing rims and if your going to go 31x10.50 get the 15x8 4" backspacing rims. i upgrade to 31x10.50 and cragar 15x8 rims. if your ever think about going bigger 31" and up i would get 15x8 rims.
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Unread 02-08-2012, 03:32 PM   #10
N8N
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I assume you've figured it out by now, but here's to translate sizes.

235/75R15 - 235mm section width, sidewalls are 75% as high as the section width of the tire, mounts on 15" rim. (this sizing convention is more common for passenger car and road-centric truck tires)

30x9.5-15 - 30" tall (diameter); 9.5" section width, mounts on 15" rim. (more common for off road type tires)

so the overall height of the 235/75 would be 2(235)(.75)(1/25.4) + 15 = about 29" tall
width is just 235/25.4 = just about 9.25"

so a 235/75R15 translated into off-road tire sizing would be basically a 29x9.25-15

or going the other way, a 30x9.5 would be something like a 245/75 or 245/80R15 (not exactly, I'm handwaving a little)

hope that made sense...
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Unread 02-08-2012, 04:08 PM   #11
Durt_Diver
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i said get a rim that has more backspacing because this is what happened to my jeep when i flexed it out with 4" backspacing and 30" tires on a 2" lift. (more backspacing like 4.5" means your tires stick out less)


getting rims with more backspacing will help keep your tires tucked under your fenders.
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Unread 02-08-2012, 04:10 PM   #12
Durt_Diver
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Quote:
Originally Posted by Shanker67 View Post
okay found the tires now..... 30/9.5/15....so the rim i select would be a 15x8? what backspacing is good? i saw "dont go lower than 4.5" isn't 4.5 the stock spacing? so would that work?

15x8x4.5?
stock backspacing is 5.25" so your rims will stick your tires out 1.25" more with 4" of backspacing. 4.5" keeps your tires under your fender better.
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Unread 02-11-2012, 12:45 PM   #13
Shanker67
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Quote:
Originally Posted by N8N View Post
I assume you've figured it out by now, but here's to translate sizes.

235/75R15 - 235mm section width, sidewalls are 75% as high as the section width of the tire, mounts on 15" rim. (this sizing convention is more common for passenger car and road-centric truck tires)

30x9.5-15 - 30" tall (diameter); 9.5" section width, mounts on 15" rim. (more common for off road type tires)

so the overall height of the 235/75 would be 2(235)(.75)(1/25.4) + 15 = about 29" tall
width is just 235/25.4 = just about 9.25"

so a 235/75R15 translated into off-road tire sizing would be basically a 29x9.25-15

or going the other way, a 30x9.5 would be something like a 245/75 or 245/80R15 (not exactly, I'm handwaving a little)

hope that made sense...

that does make sense, thanks for explaining it!
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Unread 02-11-2012, 08:27 PM   #14
XJ Jay
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I ran 31 10.5s on 15x8 wheels with 4.5" of backspacing and had no issues rubbing my fenders but the tires would touch my flairs every now and then.
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Unread 02-13-2012, 09:49 PM   #15
palmrose2
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Quote:
Originally Posted by XJ Jay View Post
I ran 31 10.5s on 15x8 wheels with 4.5" of backspacing and had no issues rubbing my fenders but the tires would touch my flairs every now and then.

See the Jeep in my sig. I have a little fender rubbing. With 5.25back spacing and 7" width I only rubbed my LCAs. I traded one for the other.

You will have NO issues @ 3" with the equivalent of 30x9.5x15 on 7 " rims.
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