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post #1 of (permalink) Old 01-17-2007, 09:21 AM
rangerdoug
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Changing from 15X7 wheels to 15X8 wheels

I'm currently running 31X10.5X15 tires on stock 15X7 wheels. I was recently given some 15X8 American Racing Outlaw II wheels. Am I going to run into a big issue installing the 15X8 wheels on my stock 1998 TJ? I've been running 31" tires on it with no problem since it was new. I like the wider wheels but don't want to have any fitting problems. Thanks!
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post #2 of (permalink) Old 01-17-2007, 10:30 AM
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Re: Changing from 15X7 wheels to 15X8 wheels

Welcome to the board!

Probably more important than the wheel width is the backspacing - the distance between the centerline of the tire and the mounting face of the wheel. If the backspacing is the same, the new wheels will be a half inch wider to the outside and a half inch wider to the inside. That will have only a very tiny effect on the tire at the sidewall and no effect at the tread.

Most guys report light rubbing with 31s on a stock TJ. Since you haven't had a problem I'm guessing that you don't use it hard off road. In that case you shouldn't have any problem with the wider wheels.

One other consideration if the wheels are aluminum; they're not ideal for off-road use. Aluminum wheels will crack much more easily than steel wheels. A moderate whack on a rock or log can create a crack that will let the air out. Usually such cracks or not repairable.

A similar blow to a steel wheel may bend it, but it will still hold air and get you out of the woods.

If you like the looks of the AR wheels and don't venture far off road, go for it.

That's my opinion - stick around to see what others more knowledgable about TJs have to say.
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post #3 of (permalink) Old 01-17-2007, 10:42 AM
rangerdoug
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Re: Changing from 15X7 wheels to 15X8 wheels

Thanks! The backspacing for the 15X8 wheels is 3.75". I'm not sure about the stock wheels.
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post #4 of (permalink) Old 01-17-2007, 05:58 PM
 
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Re: Changing from 15X7 wheels to 15X8 wheels

You'll be getting at least an extra inch of backspacing. I run a nearly identical setup. Make sure you watch your tire pressure, I ruined my 31x10.50's by having them inflated too much and the tread wore too much from the middle.
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post #5 of (permalink) Old 01-26-2007, 12:01 AM
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Re: Changing from 15X7 wheels to 15X8 wheels

[ QUOTE ]
Probably more important than the wheel width is the backspacing - the distance between the centerline of the tire and the mounting face of the wheel. If the backspacing is the same, the new wheels will be a half inch wider to the outside and a half inch wider to the inside.

[/ QUOTE ]

No, if the backspacing is the same, there will be 1" more to the outside.
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post #6 of (permalink) Old 01-26-2007, 07:15 AM
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Re: Changing from 15X7 wheels to 15X8 wheels

You're right, of course. Brain fart!
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