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  #1  
Old 02-03-2011, 06:01 PM
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Default explain this, 315 70 17 measures 33"

I walked out to the credit union this afternoon and my buddy's CTD was sitting there with new 315 70 17 BFG A/T KOs. I had my tape in my pocket so I measured across the tire. It cam up just over 33". My other buddy had his 75 3/4 ton sitting there with 35s, I measured them, 33". I can understand the 35s as they are nearly shot and tread counts. But those BFGs are nearly new. They should measure 34.5 per BFG specs. I measured across too, not from the ground up. I don't understand.
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Old 02-03-2011, 06:03 PM
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No idea!!!!! Sorry!
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Old 02-03-2011, 06:11 PM
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Pressure in the tire was not high enough? So the tire was bulging at the bottom causing it to seem shorter. I dont know just a guess.
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Old 02-03-2011, 07:31 PM
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I'd have to agree , maybe the tire pressures were low . I'm running 315's and they are definitely taller than 33's . My truck came from the factory with 33's .
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Old 02-03-2011, 08:14 PM
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Yea tires do that haha. I have the same thing with mine in 35". I think they measure like 33.5" or 34". Like mentioned above the tire is bulged at the bottom due to the weight. If you measure it before install I am sure it will be very close to the specs
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Old 02-03-2011, 09:57 PM
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My 285/75R's are listed as 34.7" tires at the recommended inflation pressure of 45 pounds. I'm gonna have to go out and measure them!
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Old 02-04-2011, 09:09 AM
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I didn't measure from the ground to the top of the tire. I measured across the tire. I'm going to measure it again today if he's here. I may be a victom of bi-focal glasses. All I know is it threw me for a loop.
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Old 02-04-2011, 04:16 PM
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No, your measuring correct! You said his tires are 315/70 not 315/75.... hence they would be 33's not 35's. The first number isn't the height its the width, and the second number is a percent of the width is the sidewall height or something like that. Hope this helps.
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Old 02-04-2011, 04:31 PM
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Quote:
Originally Posted by MoparGuy86 View Post
The first number isn't the height its the width, and the second number is a percent of the width is the sidewall height or something like that. Hope this helps.
Right on the money!
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Old 02-05-2011, 06:35 AM
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Quote:
Originally Posted by MoparGuy86 View Post
No, your measuring correct! You said his tires are 315/70 not 315/75.... hence they would be 33's not 35's. The first number isn't the height its the width, and the second number is a percent of the width is the sidewall height or something like that. Hope this helps.

You are right. Now, look up the spec for that tire at BFGs site. It says a 315 70 17 is 34.5" tall. I can see loosing an inch or so between new to worn out, but these tires are fairly new.
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