Nov 14, 2018 · As mentioned in a previous post, I went from the stock 80/100-21 to a 90/100-21 on my trail ridden CRF250X. So a 10mm increase in width and, a 10mm increase in sidewall height. Quite a bit more rubber so meaning: more sidewall height to flex, increased weight and rolling inertia. Difference was immediately noticeable, Apr 22, 2020 · For a tube, you should get a tube size that is suited to the tire you have ON the bike which is 120/80/19. You could use a tube suited for 100/90/19 but it would have to expand more to fit into the 120 so your risk of puncture goes up. Your call. I think your right, all recommended specs that I can find give 100/90-19. Maybe too much (saddle to bar) drop. Maybe too much reach. If drop is to blame then shortening the stem won't help as much as raising the stem. Second shout for finding a stem with more rise. If you are over reaching, this will reduce your back arch and lower your head angle - reducing neck strain. This is still ‘guesswork’. 110/80-R19 tires are 1.45 inches (36.8 mm) smaller in diameter than 90/90-R21 tires and the speedometer difference is 5.3%. Jun 3, 2017 · the 90/100 turns in slower than a 90/90 or 80/100. same goes for a 110/100 rear vs a 120/100 rear, same goes for an 18" vs. 19" rear, same goes for one size up on a pilot jet, same goes for a 250 vs. 300; and like anything, of course you will eventually just get used to it if you just keep riding with it, but that is not what you were wondering. ? Feb 8, 2012 · the 80/100-21 is all i run on DIRT.. having a narrower tire front or rear means better turning and will "cut" better through sand and silt.. on street there wouldn't be a noticeable difference in feel or handling between the '80 or 90'.. UNLESS the tread designs were different of course.. and mount the 80 up before judging how skinny it looks. .

80 100 vs 90 90 21