70/80-R18 tires are 1.26 inches (32 mm) smaller in diameter than 80/90-R18 tires and the speedometer difference is 5.3%
130/90-R18 tires are 0.71 inches (18 mm) larger in diameter than 120/90-R18 tires and the speedometer difference is 2.6%.
90/90-R16 tires are 0.71 inches (18 mm) larger in diameter than 90/80-R16 tires and the speedometer difference is 3.1%.
120/90-R18 tires are 0.94 inches (24 mm) larger in diameter than 120/80-R18 tires and the speedometer difference is 3.6%.
100/80-R16 tires are 1.37 inches (34.8 mm) smaller in diameter than 80/90-R18 tires and the speedometer difference is 5.8%
130/90-R16 tires are 0.24 inches (6 mm) smaller in diameter than 150/80-R16 tires and the speedometer difference is 1.0%.
100/90-R18 tires are 1.58 inches (40.2 mm) smaller in diameter than 80/90-R21 tires and the speedometer difference is 6.0%.
90/80-R17 tires are 0.63 inches (16 mm) smaller in diameter than 100/80-R17 tires and the speedometer difference is 2.7%.
100/90-R10 tires are 1.42 inches (36 mm) larger in diameter than 90/80-R10 tires and the speedometer difference is 8.3%.
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80 90 vs 90 80 tire
