Pirelli Scorpion MX Extra X Front 80/100-21 & Rear 110/90-19 Dirt Bike Tires with Keychain - Two Pack. 4.7 out of 5 stars 400. $154.96 $ 154. 96. FREE delivery Thu 90/90-R19 tires are 0.71 inches (18 mm) smaller in diameter than 100/90-R19 tires and the speedometer difference is 2.7% 70/100-R19 tires are 0.87 inches (22 mm) smaller in diameter than 90/90-R19 tires and the speedometer difference is 3.4%. 120/70-R19 tires are 0.47 inches (12 mm) smaller in diameter than 100/90-R19 tires and the speedometer difference is 1.8%. Apr 28, 2021 · We wanted this to be a very comprehensive ADV / Dual Sport Motorcycle Tires test, so we broke the tires into two categories, 80/20 (80 percent on road and 20 percent off road) and 50/50. It should be noted that we used these as generalized categories seeing as that the manufacturers all rate their tires differently (e.g. 90/10, 60/40, 25/75, 30 6223. Better Fuel Economy Factory Ratios Increased Power. vs 80/100-21 vs 90/90-21 vs 110/90-18 vs 70/100-21 vs 120/90-18 vs 100/100-21 vs 90/80-21 vs 80/100-23. 130/70-R18 tires are 2.92 inches (74.2 mm) smaller in diameter than 90/100-R21 tires and the speedometer difference is 10.4%. vKAIxOO.

80 100 vs 90 90 21