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Old 09-17-2012, 09:44 PM
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dumb wheel measurement ?

I have two different size rims/wheels on my truck. The back has super large wheels and the front has smaller wheels. I measured the front rim from the outside as being 16" across, while the rear are around 16 1/2". I just bought another set that the seller says are 16", but they're even larger than both the front and rear than I already have. I'm wanting to have the same size wheels on all four sides. I measure the ones this guy sold me to be 17 1/4"? So my question is, am I measuring these wrong? I'm taking a measure to the side of the rim facing me and measuring the outside from top to bottom. I'm confused as to why this guy sold me these 17 1/4" rims but says they're 16"? Either way they're way too big for me to use and I'm hoping to send them back to him. Am I measuring them wrong?

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Old 09-17-2012, 11:46 PM
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Are the wheels off an old 3/4 tonne pick up? Back in the 70s the 16 inch wheels used tube type tires and the 16.5 wheels were tubeless.They should have a stamped number somewhere. some of the old 16 inch wheel had larger holes for the inner tube stem to stick out.
All those wheels are kind of inter change able between gm/ford/ dodge,at least same bolt pattern.some(most) of the GM wheels had a slightly smaller hole where it slips over the rear axle extension,so all wheels fit the GM but not all GM wheels fit ford/dodge.There were also 17 inch wheels in that era,not that common and were 2 or 3 piece wheels.
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Old 09-18-2012, 05:32 AM
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Yes---you are measuring incorrectly.
The rim diameter is actually the area where the inside bead of the tires will seat on the rim..

A 15 inch wheel might measure more that 16inches.

Somewhere stamped on the wheels is the size.

will look something like this:
15X6JJ, for a 6" wide wheel ------ or 15X8JJ, for an 8" wide wheel.

This stamping coould be on the insed of the rim (where you cannot see it with the tire mounted, or stamped on the rim portion of the wheel near the valve stem hole
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Old 09-18-2012, 07:25 AM
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Bryan59EC, thanks for the info. I did look at the rims and didn't find any markings on them. The rims are kind of rough with rust and some new paint on the outside, so it might be obscured. I do see where the seller put 16" on them with a sharpie.

The truck I have is a 47 Chevy 1/2 ton. I don't think these are 2 or 3 piece wheels?

If I can't find the stamping, how do I measure them? I'm guessing I might be stuck with some big arse rims I don't need.
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Old 09-18-2012, 07:56 AM
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OK, I just figured out what you meant by measuring the inside bead of the rim. I totally measured these wrong. It appears I need a 15" not a 16" rim.

Thankfully I didn't go all Chuck Norris on the guy that sold them to me. At first I was really thinking I had been taken, but it's my own lack of knowledge that got me on this one.

Thanks again for all the info guys. I'm still learning, little by little.
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Old 09-18-2012, 07:58 AM
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The stamping is usually right by the valve stem.
Sounds like the fronts are 15's and the back 16's.
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