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Discussion Starter · #1 ·
gday - just wanting to know if the 285/75R16 tyres are either a 32" or a 33"

and also whats sizes are the 305/75 and 315/75.

Thanks for any info on this in advance.

Cheers
 

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The Googlest, Apparently!
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Or if you have a calculator handy you can work out any size pretty quickly.

285 = width;
75 = profile, or height as a percentage of width. i.e. 0.75
16 = rim size.
Therefore
285 x 0.75 = 213.75 millimeters. Multiply this by 2 as you have only worked out one side of tire.
213.75 x 2 = 427.5
Divide by 25.4 as there are 25.4mm in an inch.
427.5 / 25.4 = 16.83 inches
Add rim size
16.83 + 16 = 32.83 inches

Following this;
305 x 0.75 x 2 = 457.5
457.5 / 25.4 = 18.01
18.01 + 16 = 34.01inches
And
315 x 0.75 x 2 = 472.5
472.5 / 25.4 = 18.60
18.60 + 16 = 34.6

Round up or down to the nearest inch to give you the general size.

285/75-16 = 32.83 or 33inch
305/75-16 = 34.01 or 34inch
315/75-16 = 34.60 or 35inch
 

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do they make a 305x75, i thought it was 305x70 whick makes it after rounding off a 33x12.5 where a 285x75 = a 33x11.5
 

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do they make a 305x75, i thought it was 305x70 whick makes it after rounding off a 33x12.5 where a 285x75 = a 33x11.5
You can get 305/65 as I have, as well as 305/70 and 305/75.

Or you can go smaller in profile, as in low profile tires.

Getting LP's in 4x4 would be a different matter, but the states has plenty for their SUV market.

You can get pretty much what you want, though some you would have to import as they are not main steam tires in Oz
 
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