120/90-R17 tires are 0.31 inches (8 mm) larger in diameter than 130/80-R17 tires and the speedometer difference is 1.2%.
80/80-R17 tires are 0.08 inches (2 mm) larger in diameter than 70/90-R17 tires and the speedometer difference is 0.3%. 90/80-R21 tires are 0 inches (0 mm) smaller in diameter than 80/90-R21 tires and the speedometer difference is 0.0%. 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%. Apr 6, 2022 Β· Yes, they can if it’s modified, but for the most parts I like a 100/90-19 on a stock 125 as weight vs. horsepower is important on a small bore two stroke. Here is a quick guide to help you decide on what rear tire you should use based on your local riding areas: 450cc: Hard Pack: 120/80/19 or 120/90-19. Intermediate Terrain: 120/80-19 or 120/
100/70-R16 tires are 0.16 inches (4 mm) smaller in diameter than 90/80-R16 tires and the speedometer difference is 0.8%
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80 90 vs 90 80 tire