New tires on TJ! Need help with rims and backspacing please - Jeep Wrangler Forum

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Old 07-22-2013, 11:12 PM   #1
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New tires on TJ! Need help with rims and backspacing please

Hi, I've got a 2002 TJ X with 4.0 and 5 speed manual and assuming 3.07 axle gear. This is my recreational driver and off-road toy! Today it's bone stock but tomorrow will be adding a TeraFlex 3" lift with sway bar quick disconnects and new wheels.

At this point I'd like to not regear and not modify the fender.

Goals: better tire, better in mud and sand and climbs, slightly wider profile for balance

Judging by this chart I think I'd want 265/85r16
Goodyear Wrangler DuraTrac Tires

So here are the questions of course
1) can my TJ handle that tire which is a 31.7x10.5 without regear and not too much of an impact on pep?
2) should I go for the C to E? The E says will sit .5" wider. But it's also heavier.
3) Is going to 16's a mistake in the big picture?
4) How are Black Rock wheels, thinking of these:
Black Rock Wheels 942581237 - Black Rock Series 942 Type D Steel Wheel in Matte Black for Jeep® Vehicles with 5x4.5 Bolt Pattern - Quadratec
5) Assuming bolts are 5x4.5 and size is 16x8, right?
6) Which backspacing should I get? 5" or 4.25"

I think that last one is the zinger. As I understand it the stock BS is 6" so if I get the 5" that'll have it an 1" further out with a tire that is 1" wider, right?

I know lots of question and I appreciate help very much in advance.

Thank you!!!

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Old 07-23-2013, 07:05 AM   #2
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With 3.07s you will notice a difference with 31" tires. You'll use your 5th gear less often, you'll be downshifting even for slight hills.
But you'll get used to it.

Wheels, and tire diameter (15, 16, 17) are personal preference.
I prefer a 15, more rubber between the wheel and the road
IIRC, stock backspacing is 5.5" (or is it 5"?)
Anyway, 4.25 will be good. Going with the 4.25 should allow you to run a taller/wider tire in the future if you want, without serious rubbing complications.

Ya, bolt patern is 5x4.5.

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Old 07-23-2013, 07:11 AM   #3
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Thank you very much. Am I thinking of backspacing correctly... if I go an inch less than stock that my tire will stick out an inch further?
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Old 07-23-2013, 07:47 AM   #4
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That is the correct way to think of it
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Old 07-23-2013, 09:48 AM   #5
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Okay, thank you, now I'm getting it. If I opt to do 31x10.5r15 DuraTracs, what backspacing should I get on new wheels? Would 4" be going out too far?
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Old 07-29-2013, 03:04 PM   #6
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have a jkur with 2.5 lift ... 17x9 wheels with +10mm offset and 5.5 backspace .. will I need spacers to run 35x12.5.... thanks for any help.
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Old 07-31-2013, 04:45 PM   #7
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If you're going to stay with 31s and never ever consider going to 33s, then 4.5 would be ok but if you'll think you'll go to 32s or 33s, you might want to consider less backspacing. I have 3.65" backspacing and no rubbing problems my tires measure 32x11. I have pics on my profile take a look
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Old 08-01-2013, 07:34 PM   #8
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I know I have backspacing problems but I am not sure what my backspacing is. I know my tires are 32x11.5 and I can see rubbing marks on my trailing arm???
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Old 08-04-2013, 12:07 PM   #9
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Show a pic of your wheel, I'll find out what it is
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Old 08-08-2013, 09:38 PM   #10
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What are mine?
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Old 08-08-2013, 11:15 PM   #11
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That's easy. Yours are Gambler 15x8" wheels 5.25" backspacing. My jeep came with those too.
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Old 08-08-2013, 11:19 PM   #12
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Thanks

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