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Old 03-07-2009, 09:02 AM   #1
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Tire chart

Is there a chart that shows the differences in tire sizes? Im looking to figure out from metric to standard. I want 31's, but what is equal to that size? I found a good deal on 235/75/15 but not sure how to find out the size of that tire.
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Old 03-07-2009, 09:12 AM   #2
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This is the best one I know of.

Tire size calculator

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Old 03-07-2009, 09:35 AM   #3
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that just helps calculate speed. Im trying to figure out if a 235/75/15 is closer to a 31x10.50 or what size is close to it.
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Old 03-07-2009, 10:14 AM   #4
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Originally Posted by orange05tj View Post
that just helps calculate speed. Im trying to figure out if a 235/75/15 is closer to a 31x10.50 or what size is close to it.
Is this one better?
Tire Dimensions Made Simple - Discount Tire

235/70/17=30x9.5
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Old 03-07-2009, 10:16 AM   #5
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Quote:
Originally Posted by orange05tj View Post
that just helps calculate speed. Im trying to figure out if a 235/75/15 is closer to a 31x10.50 or what size is close to it.
235 is the amount of mm across the tread width. 75 is the percentage of 235, as the hight of the side wall.

235mm = 9.25 in

9.25in x .75 = 6.94in (sidewall)

6.94 x 2 = 13.875 = 15 (rim) = 28.875

so those tires would be 28.875 (29in) x 9.25in (9.5) x15

Hope that helps make your decision easier.
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Old 03-07-2009, 10:17 AM   #6
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Quote:
Originally Posted by RednekYJ View Post
Is this one better?
Tire Dimensions Made Simple - Discount Tire

235/70/17=30x9.5
You beat me by about a minute.
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Old 03-07-2009, 10:23 AM   #7
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thanks for the replies. Much help
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Old 03-07-2009, 10:35 AM   #8
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what would be the smallest width tire to run on a 15x8 rim? I just want to downsize the tires, not change the rims. Im looking for a 31 10.50, but it seems like the metric size is cheaper.
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Old 03-26-2009, 10:17 PM   #9
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divide the metric numbers on tire sizes by 25.4 and it converts to inches....I dont have a calc handy, but for instance, P255 tire would be approx a 10" wide tire.
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Old 03-27-2009, 01:43 AM   #10
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Quote:
Originally Posted by orange05tj View Post
what would be the smallest width tire to run on a 15x8 rim? I just want to downsize the tires, not change the rims. Im looking for a 31 10.50, but it seems like the metric size is cheaper.
I wouldn't go any smaller than an 8.5 or 9" tire on an 8" wide wheel. Just IMO.
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Old 03-27-2009, 08:03 AM   #11
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I wouldn't go any smaller than an 8.5 or 9" tire on an 8" wide wheel. Just IMO.
I went back to the 30 X 9.50's on the MT rims

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