100/90-R21 tires are 1.42 inches (36 mm) larger in diameter than 80/90-R21 tires and the speedometer difference is 5.0%.
80/100-21 vs 90/90-21 vs 90/100-21. I have read a couple of threads but info seems fairly varied to the advantages/ uses of the different sized front tyres. A tyre rep told me that basically 80/100 is for MX, 90/100 is for off road and 90/90 is a bit of both. He reckoned 80/100 holds in ruts better.
110/80-R14 tires are 0.55 inches (14 mm) larger in diameter than 90/90-R14 tires and the speedometer difference is 2.6%.
90/90-R19 tires are 2.71 inches (68.8 mm) smaller in diameter than 100/90-R21 tires and the speedometer difference is 9.7%.
90/90-R21 tires are 0.24 inches (6 mm) smaller in diameter than 120/70-R21 tires and the speedometer difference is 0.9%.
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80 100 vs 90 90 21
