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Old 04-29-2012, 09:12 AM   #1
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New wheels for TJ

Ok I'll put a pic of the tires and stock wheel I have on now but I don't know what size they are, I think they are 15x8 and have no idea what backspacing they are and they need to know that for which wheel size to put on the tire and my tire size now is 30x9.50x15lt

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Old 04-29-2012, 11:32 AM   #2
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Those are likely a 15x7 which is fine for up to about the 32x11.50 tire size. For new wheels, 15x8 is a popular size which is good for up to 12.5" wide tires.

For backspacing, 4.5" to 3.75" is good for most any size tire we typically run on our Jeeps.

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Old 04-29-2012, 03:43 PM   #3
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Is it the bigger the number the more the tires stick out?
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Old 04-29-2012, 05:58 PM   #4
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The more backspacing a wheel has, the more inside the wheel wells the wheel is positioned.

A factory Jeep wheel typically has 5.5" of backspacing. A similar aftermarket wheel with 4.5" of backspacing, for example, would stick out of the wheel well 1" more than the factory wheels with 5.5" of backspacing would.

The yellow tape measure in the below photo is measuring the wheel's backspacing which is the distance between the wheel's mounting flange surface and its inner-most wheel edge.
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Old 04-29-2012, 06:04 PM   #5
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Those are definitely 15x7 as those were the stockers on my 99. Upgraded to Cragar Soft 8 15x8s and they stick out an inch farther than the stock wheels did with the same tire just as Jerry indicated. You can get a set of 4 of those shipped for under $250 from summitracing if you're thinking of ditching the stock wheels and you'll be shocked at how much nicer they look on your Jeep.
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Old 04-29-2012, 06:50 PM   #6
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so, 17x9 on a 98 TJ....stick out 2" past what was stock? I'm going up to 16 or 17 and 33s.
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Old 04-29-2012, 07:36 PM   #7
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Quote:
Originally Posted by Horny Ringman View Post
so, 17x9 on a 98 TJ....stick out 2" past what was stock? I'm going up to 16 or 17 and 33s.

It will depend on Backspacing, NOT on Rim Diameter.
RE-read what Jerry has said, very well I might add.

Quote:
Originally Posted by Jerry Bransford View Post
The more backspacing a wheel has, the more inside the wheel wells the wheel is positioned.

A factory Jeep wheel typically has 5.5" of backspacing. A similar aftermarket wheel with 4.5" of backspacing, for example, would stick out of the wheel well 1" more than the factory wheels with 5.5" of backspacing would.

The yellow tape measure in the below photo is measuring the wheel's backspacing which is the distance between the wheel's mounting flange surface and its inner-most wheel edge.
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Old 04-29-2012, 07:41 PM   #8
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So on 30x9.50/15 with a 15x8 rim and 4 inch backspacing will my tire stick out a lil more
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Old 08-20-2012, 07:02 AM   #9
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Quick ? With the the 30x9.5x15 what is a good tire inflation on it

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