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Old 08-25-2008, 11:27 AM   #1
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Newbie Wheel & Tire Question

Is there an easy way to determine the width of a wheel while the tire is mounted on it?

I bought a YJ with 33x12.5R15's on American Racing 767's and I want to get a full size spare but I want to make sure I am buying exactly what is already on there.

Any help would be appreciated!
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Old 08-25-2008, 01:46 PM   #2
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Cut two pieces of cardboard in a C shape, put one set of ends together and put a bolt thru them, you now have a big caliper, put it around the tire so it touches the wheels rims on both sides, tighten bolt and measure with a ruler.

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Old 08-25-2008, 03:52 PM   #3
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Do you have aluminum or steel wheels? Some of the aluminum wheel makers will stamp the wheel size on the back side of the wheel. If you have steel or it is not stamped RICHP's trick will do the job for you.
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Old 08-25-2008, 04:21 PM   #4
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cut two pieces of cardboard in a c shape, put one set of ends together and put a bolt thru them, you now have a big caliper, put it around the tire so it touches the wheels rims on both sides, tighten bolt and measure with a ruler.
genius!!!!
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Old 08-25-2008, 04:22 PM   #5
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Do you have aluminum or steel wheels? Some of the aluminum wheel makers will stamp the wheel size on the back side of the wheel. If you have steel or it is not stamped RICHP's trick will do the job for you.
They are steel and I was hoping it would be stamped but no such luck. That was the first place I checked.
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Old 08-25-2008, 05:58 PM   #6
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how about measuring the backspacing and the front spacing and add them together
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Old 08-26-2008, 08:46 AM   #7
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how about measuring the backspacing and the front spacing and add them together
Thought about that too. I guess what I was asking was whether or not there were any specifics to look out for. Like if a 15x9 wheel actually will measure 15x8.5 or anything like that which I should be on the lookout for.

Thanks for all the ideas guys!

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