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Old 11-29-2012, 06:50 PM   #1
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tires and back spacing.

I have a '99 tj. It has aftermarket aluminum rims on it... the back spacing isnt what it is on stock rims... I believe this is why it has 31 x 9.5 x 15 on it... I was wanting to go up to the 10.5's... you guys think spacers would be the way to go? Also, does the rim width dictate the tire width, somewhat? I am all new to this.... would like to do it right. Any and all help is appreciated!!! Thanks!

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Old 11-29-2012, 07:33 PM   #2
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Quote:
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I have a '99 tj. It has aftermarket aluminum rims on it... the back spacing isnt what it is on stock rims... I believe this is why it has 31 x 9.5 x 15 on it... I was wanting to go up to the 10.5's... you guys think spacers would be the way to go? Also, does the rim width dictate the tire width, somewhat? I am all new to this.... would like to do it right. Any and all help is appreciated!!! Thanks!
I don't know what backspacing you have now on your wheels, but wheel spacers might help.
And yes, different width tires require different width rims. Look up tire sizes on tirerack. Look at the "specs" and they show the wheel width range for different size tires. I believe the minimum wheel width for a 10.5" wide tire is 7"

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Old 11-29-2012, 08:00 PM   #3
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You should be good with just about any 15 inch wheel and a 31" tire. Backspacing on the wheel will dictate if you rub or not. Its all gonna depend on what backspacing you have now. See if you can find out your backspacing. Lots of info through Google. Help us help you.
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Old 11-29-2012, 08:09 PM   #4
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You want to go up to 10.5" wide tire or 10.5" wide wheel? Assuming you mean 10.5" as in 31x10.50 tire, nearly any 15x7 or 15x8 wheel is fine... with a 15x7 being optimal for that size tire though 15x8 will work fine.

For a 31x10.50 tires, 5" of BS is probably pretty optimal. 3.75" will work but will cause the wheel to protrude out of the wheel well further than necessary or is needed.

I'm no fan of wheel spacers. They just add cost & extra lug nuts to have to worry about. Not to mention some wheelspacers cost more than some aftermarket wheels do.
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Old 11-29-2012, 08:53 PM   #5
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Hmmm... ok I am wanting to use the same rims.... but buy 31x10.5x15's. I am fond of the wider look/stance... I will not be doing any hard wheelin with this machine... just some trails and the like... I do like these rims... You gentlemen know these rims at all? Thoughts?
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Old 11-29-2012, 09:07 PM   #6
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Those are factory Jeep wheels which has 5.5" of backspacing... a little too much backspacing for a 31x10.50 tire since its sidewall will rub on the lower control arms when you cut the steering wheel all the way left or right.

The good news is that is a minor problem that is fixed in 5 minutes for the cost of two flat washers as described at Jeep Steer Stop Adjustment
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Old 11-29-2012, 09:43 PM   #7
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You can determine your existing rim width by putting a straight edge across both the inside and the outside of the tire at it's thickest part) and measuring between them, then measure between the straightedge on the outside and the tire bead part of the rim, add about 1/4" (thickness of the rim metal), then double that number and subtract the doubled number from your first measurement. It might be easiest to do on the spare if it has the same rim.
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Old 11-29-2012, 09:59 PM   #8
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Well, It Does rub now, if I turn to its full extent either way..... this washer shim method will clear that up for the 10.5 wide tires?
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Old 11-29-2012, 10:02 PM   #9
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ahhh I was just lookin at those pics in the steer stop method.... I would almost bet my bolts are gone... this jeep has had some mods done to it...
Ty all so much for helping!!! =]
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Old 11-29-2012, 10:04 PM   #10
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BTW guys... Just lookin at that Jeep, do you think 33's would be better on there? Or stick with the 31's...
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Old 11-29-2012, 11:47 PM   #11
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I put 31x10.5s on my factory wheels. Rubbed on the arms. Did the washer trick. Hated the lost turning radius so I switched to the wheel spacer trick. Just went with the minimum 1" spacers. Did the trick, now I have full turning radius back. Bought nice billet aluminum machined spacers off a place I found on eBay. Only $120 for a set of 4. Maybe not the best option, but it has worked so far without any side effects.

Your jeep would look good with 33's (they all do!). Search all over this forum for how to get 33's on your jeep.
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Old 11-30-2012, 07:42 PM   #12
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You remember who you got your spacers from? I am thinking that's the route I am going to go...
Thank you all for all of your help!!! This jeep stuff is really cool...
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Old 11-30-2012, 07:56 PM   #13
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Originally Posted by Jeepn Again View Post
I put 31x10.5s on my factory wheels. Rubbed on the arms. Did the washer trick. Hated the lost turning radius so I switched to the wheel spacer trick.
I dunno but I've installed steering stop washers on several TJs and with even two washers under each of the two steering stop bolts as I needed once, never noticed the minor increase in steering radius. Obviously it is there but it certainly isn't dramatic. I no longer need the washers on my steering stop bolts due to different wheels but they are so unnoticeable that I'm not bothering to remove them. The folks I did it for didn't notice either when I asked them if they could tell the difference. For anyone considering doing this, I can assure you the difference is very negligible. In fact, I've never heard anyone else ever complain about it.
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Old 11-30-2012, 08:18 PM   #14
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This reminds me- I never did remove the washers from mine.
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Old 11-30-2012, 09:00 PM   #15
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I believe I will try the washers first. If that feels weird, or I don't like the feel of it, I will go with the 1" spacers... I will be going with the 33 x 10.5 x 15's. I know they will look good on there!!!
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Old 11-30-2012, 09:04 PM   #16
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The front wheel studs are longer than 1", so make sure your wheels have a "void" in the casting between the lug holes for clearance where the studs will stick out beyond the 1" wheel spacers. I know my Canyon wheels did, but I don't know about others. Otherwise, go to 1.25" spacers.

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