I've clocked mine with a GPS and I know I'm 16% off. At 50 I'm doing 58 so that means every 100 miles on the o-meter I'm going 116 miles. All Kais' came with 205s which are 27.1 inches tall (205 / .75 x 24.5 x 2 + 15 = 27.1). 25.4 converts mm to inches. Your should be the same as mine.
Hope that helps, Dennis

95 Sportage, gone but not forgotten.
98 Jeep TJ, 4" Zone springs with RC Long arms, Ford 8.8", 4.56 gears & Detroit locker rear, D30, 4.56 & Detroit Trutrack front.