Odometer reading
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Joined: Jun 2003
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From: Houston, Texas
Originally Posted by rebel_ford4x4
what would the actual speed difference be going from 235's to 31's?
235= tread width (in millimeters)
75= % of the value of tread width that is the sidewall
16= rim size (in inches)
So this example would yield a tire size of the following:
235mm= 9.3"
9.3" x .75= 7.0"
7" + 16"= 23" tire
Logistics Pro
Joined: Jan 2002
Posts: 3,739
Likes: 3
From: GANS
Originally Posted by JeremyH
When wanting to convert from metric to standard size, you need to provide the entire size of the tire. i.e. 235 75 R16 All of those numbers are used in the calculation.
235= tread width (in millimeters)
75= % of the value of tread width that is the sidewall
16= rim size (in inches)
So this example would yield a tire size of the following:
235mm= 9.3"
9.3" x .75= 7.0"
7" + 16"= 23" tire
235= tread width (in millimeters)
75= % of the value of tread width that is the sidewall
16= rim size (in inches)
So this example would yield a tire size of the following:
235mm= 9.3"
9.3" x .75= 7.0"
7" + 16"= 23" tire
23.5cm x 1/2.54
9.25 x .75 = 7"
7" x 2 + 16 = 30"
your normal 235/75R15 would be
7" x 2 + 15 = 29"
you have to multiply the sidewall by 2, since it is round.
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