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Old 02-08-2011
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tire sizessssss?

looking to get new rubber for the GMC. problem is, i dont know anything about tire sizes with 16inch rims.

What i have on there now are 265/70R16.

They really are not as wide as i want them. when the number in the middle goes down does the tire get wider? say like a 265/"65"R16? and the tires stance is not as tall?

any help would be great thanks guys.
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Old 02-08-2011
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The first number is the tire width in mm or 265 mm wide(10.43 in), the second number is the aspect ratio or the sidewall as a % of the width 70%x 265=198.75mm (7.82 in) and of course the third is the rim size. rim size + 2 sidewalls = how tall a tire is. so a 265/70/16 is
10.43 in wide
7.82+7.82+16= 31.64 in tall

A taller tire would be a 275 or 285...
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Old 02-09-2011
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Quote:
Originally Posted by wvcat View Post
The first number is the tire width in mm or 265 mm wide(10.43 in), the second number is the aspect ratio or the sidewall as a % of the width 70%x 265=198.75mm (7.82 in) and of course the third is the rim size. rim size + 2 sidewalls = how tall a tire is. so a 265/70/16 is
10.43 in wide
7.82+7.82+16= 31.64 in tall

A taller tire would be a 275 or 285...
That's the best explanation to how tire size works that I've ever read.
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Old 02-09-2011
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Sorry i used this at the following website to calculate this for a 30x9.5/15

http://www.4lo.com/calc/gearmetric.htm

Last edited by RangerXL; 02-09-2011 at 11:30 AM.
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Old 02-09-2011
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no when doing standard sizing 30(overall diameter) x 9.5 (tire width) x 15(rim size)
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Old 02-09-2011
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whats wider a 265/70 or a 265/65?
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Old 02-09-2011
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Quote:
Originally Posted by wvcat View Post
The first number is the tire width in mm or 265 mm wide(10.43 in), the second number is the aspect ratio or the sidewall as a % of the width 70%x 265=198.75mm (7.82 in) and of course the third is the rim size. rim size + 2 sidewalls = how tall a tire is. so a 265/70/16 is
10.43 in wide
7.82+7.82+16= 31.64 in tall

A taller tire would be a 275 or 285...
Quote:
Originally Posted by cucukid124 View Post
whats wider a 265/70 or a 265/65?
265/70/16 = 30.6x10.4/16
265/65/16 = 29.6x10.4/16

to get wider the first number needs to increase. 285 or 305 would be the next sizes.
how big of a tire do you want?
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Old 02-09-2011
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or if the aspect ratio is increased like from a 75 to an 85
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Old 02-09-2011
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Quote:
Originally Posted by wvcat
or if the aspect ratio is increased like from a 75 to an 85
Second number is just determines sidewall height (overall size). My understanding is he wants a wider tire
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Old 02-09-2011
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Oh yeah, I forgot he wanted wider not taller. I that case he might consider a 285 65 to stay close on the height
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Old 02-09-2011
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a 285/65 series would put you how you want. gives you almost an inch wider tire and is about the same hight. unless you wanna go close to 12 inchs wide lol

265/70 - 10.43/30.60
285/65 - 11.22/30.58
305/60 - 12.00/30.40
315/60 - 12.40/30.88

Last edited by Willzane; 02-09-2011 at 05:44 PM.
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Old 02-09-2011
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im likin the 305/60
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Old 02-10-2011
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^ haha I agree.
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