Metric - Imperial tire size conversion chart

[corax]

found this and thought I would post it up for posterity sake - maybe sticky or wiki?

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Metric to Imperial tire conversion chart
Metric = Imperial Metric = Imperial Metric = Imperial
215/75/15 27.7"x 8.5" 245/75/16 30.5"x 9.6" 315/70/17 34.9"x 12.9"
225/70/15 27.4"x 8.9" 255/70/16 30.0"x 10.0" 275/65/18 32.1"x 11.0"
225/75/15 28.3"x 8.9" 265/70/16 30.6"x 10.4" 375/50/18 33.0"x 15.4"
235/75/15 29.0"x 9.3" 265/75/16 31.6"x 10.4" 325/60/18 33.2"x 13.3"
245/75/15 29.5"x 9.6" 275/70/16 31.2"x 10.8" 325/65/18 34.8"x 13.5"

255/75/15 30.0"x 10.0" 285/75/16 32.8"x 11.2" 305/70/18 35.0"x 12.2"
265/75/15 30.6"x 10.4" 295/75/16 33.4"x 11.6" 375/60/18 35.7"x 15.5"
205/85/16 29.7"x 8.1" 305/70/16 33.0"x 12.2" 395/65/18 37.8"x 15.7"
215/75/16 28.7"x 8.5" 315/75/16 34.8"x 12.9" 325/50/20 33.0"x 13.2"

225/70/16 28.4"x 8.9" 375/55/16 32.8"x 15.5"
225/75/16 29.2"x 8.9" 395/70/16 37.9"x 16.0"

235/70/16 29.0"x 9.3" 245/70/17 30.6"x 9.8"
235/85/16 31.7"x 9.3" 265/70/17 31.6"x 10.7"
245/70/16 29.5"x 9.6" 285/70/17 33.0"x 11.5"

[CJM]

Good find!

Just an FYI:

Not all tires are the sizes listed, check the manufactures website to be sure.

[troyboy162]

thanks! these are a good reference. like CJM said there is some variance. my treadwrights are listed as 33.2" i would imagine thats about the size of most deep lug 285's

[corax]

like CJM said there is some variance.


that's true with any tire, regardless of having an Imperial or Metric size . . . My 32" BFG AT's with ~80% tread left only measure 31" with the tire off the ground. Rule of thumb is that the true diameter is generally smaller than the size listed.

[4runnerchevy]

Funny Chart, but good info. My 36" tires are not listed, and they were only 35.5's when they were new.

[mastacox]

Here you go, I've been meaning to make a Wiki on this for a while now:

http://www.ultimateyota.com/index.php?option=com_openwiki&Itemid=60&id=wiki:metric-tire-conversion

If a tire size is missing in there, the reason its a Wiki is so people can add to it at will. Try to keep things in order :)

[corax]

Here you go, I've been meaning to make a Wiki on this for a while now:


:thumbup: good job on the wiki

[Good Times]

Thanks for the wiki Brian!