Tire overall diameter calculation

[EKellock@aol.com]

With the tire size itself you can calculate the theoretical diameter of the
tire.  The actual diameter may vary depending on manufacturing variations.

195-60-14:

(195mm x 60% x 2) + (14 in x 25.4) = 589.6mm / 25.4 = 23.2125 inches

205-50-15:

(205mm x 50% x 2) + (15in x 25.4) = 586mm / 25.4 = 23.0708 inches

I usually just leave it in mm since I'm just using the figures for
comparison.
(The conversion I'm using is 25.4 mm per inch.)

So basically these two sizes of tire are the same overall diameter.

Ed Kellock
Lansing, IA
87 5KCSTQ
87 CGT 2.3