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4bd1discovery
27th February 2010, 03:25 PM
how much bigger will a 305/75/16 look beside a 285/75/16? how are they measured?
V8Ian
27th February 2010, 03:33 PM
305/285 is the width in mm, 75 is the aspect ratio, ie the height of the tyre is 75% of the width. All sizes are nominal and will vary to greater or lesser degree, between brands/models.

So all things being equal, theoretically a bit over 1/2" difference.
Cosmic Tourist
27th February 2010, 04:43 PM
Theres a few tyre size calculators around,

Tire size calculator (http://www.miata.net/garage/tirecalc.html)
is good for what you want I think, also
Tire Size Calculator - tire & wheel plus sizing (http://www.1010tires.com/TireSizeCalculator.asp?action=submit)
and I find
Disco Tire Fitting Guide (http://members.shaw.ca/jbarge/tires.html)
informative

Cheers