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Old 10-30-2008, 09:46 PM   #1
hdflstf
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Tire Diameter or Size Question 72 GMC 4x4 (stock)

I'm looking for what the original equipment tire diameter was on a 72 GMC 3/4T 4x4. I need to do some math to figure out how far off the speedometer is but I need to get the starting point...

TIA
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Old 10-30-2008, 10:15 PM   #2
Stocker
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Re: Tire Diameter or Size Question 72 GMC 4x4 (stock)

May have been optional sizes... Should be the same as my '72 K20, though. It came with 7.50-16s, about 31.8" tall iirc. Armstrong Norsemans (traction) in that size were 32.2", again if my memory is correct.

A bit of searching indicates 265/75-16 may be close to the same diameter as the OEM bias-ply tires.

If you don't have them already, here's a couple of calculators:
http://www.discounttire.com/dtcs/infoTireMath.dos
http://www.miata.net/garage/tirecalc.html
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Last edited by Stocker; 10-30-2008 at 10:28 PM.
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Old 10-30-2008, 11:56 PM   #3
hdflstf
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Re: Tire Diameter or Size Question 72 GMC 4x4 (stock)

Thanks. That gets me a start on how much my speedo is off.
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