Nov 9, 2011 · (2) 90/100-21 --- 90mm x 100% = 90mm Therefore, a 90/100-21 tire is 10mm (~ 0.4 inches almost a 1/2 inch!) taller than an 80/100-21. This is NOT trivial as AxlBundy points out (BTW, I'm from Blaine, MN - grew up on Laddie Lake). Tire Tube, Heavy Duty, Butyl Rubber, TR4 Straight Metal Stem, 90/90-21, 90/100-21, 80/100-21, 2.75/3.00-21, Each. Part Number: IRC-T20076 5.0 out of 5 stars 110/90-R18 tires are 0.08 inches (2 mm) smaller in diameter than 100/100-R18 tires and the speedometer difference is 0.3% Material Condition Yield Strength [ksi] Ultimate Strength [ksi] Elongation % Elastic Modulus [psi] Density [lb/in 3] Poisson's Ratio; AISI 4130: Hot Rolled: 70: 90: 20 Jul 18, 2022 · E.g. the GT216 90/100 has less grip on snotty roots and rocks than the slightly smaller Michelin Enduro Medium 90/100 because the Michelin has a slightly softer compound. The IRC VX40 80/100 is better still, because it's softer than either of the other two. 3. 70/100-R21 tires are 0.79 inches (20 mm) smaller in diameter than 80/100-R21 tires and the speedometer difference is 2.9%. .

80 100 vs 90 90 21