i have a set of 30x9.5x15 tires and i was wondering what the metric dimentions of these are??

 

it's not hard to figure out.

in the form
xxx-yy-Rzz

xxx is the width of the tire in millimeters: 9.5*25.4=241 (so since they round to multiples of 5, that'd be a 240)

yy is the ratio of the sidewall height to the width. (30-15)/2=7.5 7.5/9.5=.789. since they also go in multiples of 5, that's be an 80 series tire

zz is the wheel size = 15

so 30x9.5x15 = 240-80-R15

notice: to uniquely identify a tire it requires three values (there are three degrees of freedom in tire size). the easy way is 30x9.5x15 since the three values are the width, height, and wheel size. but there are many different ways to define three values to uniquely id the wheel. and the width, sidewall ratio, and wheel size is another way.

 

thanks for the help

 

a hair bigger than 235/75R15s, depending on brand. (all tires are not created equal....)