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Tire overall diameter calculation
With the tire size itself you can calculate the theoretical diameter of the
tire. The actual diameter may vary depending on manufacturing variations.
(195mm x 60% x 2) + (14 in x 25.4) = 589.6mm / 25.4 = 23.2125 inches
(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
(The conversion I'm using is 25.4 mm per inch.)
So basically these two sizes of tire are the same overall diameter.
87 CGT 2.3