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Old 11-21-2006, 09:12 PM
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Tire tread depth measurements

I'm swapping my summer for snow tires. And I'm to lazy to go out and buy a tire tread depth gauge. So I'm going to post a conversion from 32's to MM. Tires are normally measured 1/32".
This works good if you have a digital caliper. You can also use this if your selling tires like on ebay. Heres a MM conversion.


Conversion chart
1/32" is 0.79 mm
2/32" is 1.59 mm
3/32" is 2.38 mm
4/32" is 3.18 mm
5/32" is 3.97 mm
6/32" is 4.76 mm
7/32" is 5.56 mm
8/32" is 6.35 mm
9/32" is 7.14 mm
10/32" is 7.94 mm
11/32" is 8.73 mm
12/32" is 9.53 mm
13/32" is 10.32 mm
14/32" is 11.11 mm
15/32" is 11.91 mm
16/32" is 12.70 mm
17/32" is 13.49 mm
18/32" is 14.29 mm
19/32" is 15.08 mm
20/32" is 18.88 mm
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Last edited by justen; 11-22-2006 at 03:59 AM.
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Old 11-22-2006, 06:55 AM
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And for us old guys with dial calipers using thousandths of an inch:
(all conversion numbers are rounded off to the nearest thousandth of an inch)

1/32" is 31 thousandths
2/32" is 63
3/32" is 94
4/32" is 125
5/32" is 156
6/32" is 188
7/32" is 219
8/32" is 250
9/32" is 281
10/32" is 313
11/32" is 344
12/32" is 375
13/32" is 406
14/32" is 438
15/32" is 469
16/32" is 500
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Old 11-22-2006, 06:56 AM
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Don't digital calipers have a toggle to show either inch or millimeter?
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Old 11-22-2006, 07:57 AM
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Quote:
Originally Posted by dancerman
Don't digital calipers have a toggle to show either inch or millimeter?
Yes, they do....
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Old 11-22-2006, 08:40 AM
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I prefaced my statement with "old guys" and "dial calipers" (you know the ones you have to read the dial on) Good thing I didn't mention venier calipers (shssh, those you actually have to know how to read).
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Old 11-22-2006, 01:43 PM
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im waiting for olddog to reply with "use a penny"
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Old 11-22-2006, 01:59 PM
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lol On tirerack I wanted some info on measuring tread, All they had was buy a depth tread gauge. Or the other option use a penny or nickel or quarter. I was like hey thats not accurate. What if I wanna sell these things. Put in the paper. That according to a penny they are still good? lol
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