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Converting the XXX\XX\XX into actual inch numbers.

How do you do this?

Ex; 275/40/17 would convert to what in diameter and width, and how do you convert it?

ive always used
http://www.miata.net/garage/tirecalc.html
hope this helps

Quote:

Originally Posted by RCTrucker7 (Post 330001)

How do you do this?

Ex; 275/40/17 would convert to what in diameter and width, and how do you convert it?

The 275 is the width of the tire in millimeters, in this case it equals 27.5 centimeters.

The 40 is the aspect ratio, as in the sidewall height of the tire is 40% of the width. Therefore, that tire would have a sidewall height of 110 millimeters or 11 centimeters.

The 17 is the diameter in inches.

1 inch = 2.54 centimeters, 1 centimeter ~ .3937 inch (1/2.54)

Scott