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Old 04-05-2015, 09:24 PM   #1
wideopen1967
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Rally Wheel Width

What is the width of the standard rally wheel? and where you you measure? Inside of the bead or outside? Pretty sure mine is 8". Considering Buying 10's for the rear and trying to figure out the backspacing.

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Old 04-05-2015, 09:46 PM   #2
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Re: Rally Wheel Width

The truck rallys came in 7 and 8" widths. The 6 1/2" were available on the vans. The width is measured between the rim beads.
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Old 04-05-2015, 09:55 PM   #3
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Re: Rally Wheel Width

That's what I figured. I measured with the tire on the rim, air out laying flat on the floor with a straight edge across the to and I got 9" with a 4 1/2 inch backspace. So I'm thinking a 10" wheel with a 5" backspace.
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Old 04-05-2015, 10:13 PM   #4
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Re: Rally Wheel Width

That'll do it. And with 295/50 or 275/60 the 10's look *****n .
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Old 04-05-2015, 10:34 PM   #5
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Re: Rally Wheel Width

Does a 265/70 stretch over a 10?
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Old 04-05-2015, 11:05 PM   #6
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Re: Rally Wheel Width

Quote:
Originally Posted by wideopen1967 View Post
I measured with the tire on the rim, air out laying flat on the floor with a straight edge across the to and I got 9" with a 4 1/2 inch backspace. So I'm thinking a 10" wheel with a 5" backspace.
9" outside-to-outside would be an 8" wheel. Backspacing for an 8" wheel is 4-1/4". Backspacing is measured at the back of the wheel from the hub mounting surface to the OUTSIDE of the inner rim.

Also, on a GM 8" rally, you will see 15x8 JJ stamped somewhere on the wheel.

This should help:
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Old 04-06-2015, 12:25 PM   #7
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Re: Rally Wheel Width

Thanks Mike!
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Old 04-06-2015, 12:28 PM   #8
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Re: Rally Wheel Width

275 / 60 is what is on my Son's 95
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Old 04-06-2015, 01:21 PM   #9
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Re: Rally Wheel Width

Quote:
Originally Posted by wideopen1967 View Post
That's what I figured. I measured with the tire on the rim, air out laying flat on the floor with a straight edge across the to and I got 9" with a 4 1/2 inch backspace. So I'm thinking a 10" wheel with a 5" backspace.
That puts the wheel/tire centered in the wheel well opening w/a factory width 73-87 rear end housing.
275/60's would get my vote. They look nice & square on a 10" wheel vs pinched slightly & the height remains close to OE.
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Old 04-07-2015, 10:25 PM   #10
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Re: Rally Wheel Width

Quote:
Originally Posted by wideopen1967 View Post
275 / 60 is what is on my Son's 95
Back in the day, I had 275/60s on all 4 corners of an 81 LWB with 8" rallys. The tires were probably a bit wide for the wheels, but they looked OK and the truck would grip the road like crazy in corners.

Turns out BFG recommends 7.5" to 9.5" wheels. Go here and click on the "Specs" tab below the tire pictures.

http://www.tirerack.com/tires/tires....omCompare1=yes
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1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
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