100/90-R19 tires are 1.29 inches (32.8 mm) smaller in diameter than 90/90-R21 tires and the speedometer difference is 4.7% from Celsius to Fahrenheit: first multiply by 180 100, then add 32. from Fahrenheit to Celsius: first subtract 32, then multiply by 100 180. 180 100 can be simplified to 9 5, and 100 180 can be simplified to 5 9, so we get this: °C to °F: Divide by 5, then multiply by 9, then add 32. 80/90-R14 tires are 0.71 inches (18 mm) smaller in diameter than 90/90-R14 tires and the speedometer difference is 3.5%. The answer lies within the way the furnaces are installed. Typically, a low-efficiency furnace (80%) draws air from inside the home. Through open combustion, it burns gas by getting the air around it and then spews the waste gas to the outside. On the other hand, a high-efficiency furnace (90%) draws air from the outside of the home via a PVC pipe. Oct 24, 2012 · If have a conventional axle you want 75W-90 or 80W-90 GL-5 spec in Dino or Synthetic. If you have a limited-slip axle you can use the same or use a heavier-duty 75W-140 hypoid gear lube also in GL-5 spec. If you have a limited-slip axle with a clutch-type diff also add a friction modifier for limited-slip applications to prevent chatter. TKC80s: On and Off Road Grip, Traction, and Dual Sport Performance. Products. Personal. Motorcycle. Proven and tested for long hauls and competition. Self-cleaning tread pattern. High levels of side stability on soft surfaces. 80/100 - 21 m/c 51r mst. 80/90 - 21 m/c 48p m+s. 2.75 - 21 45p tl dual purpose. 90/100 - 21 m/c 57m m+s. 120/70 b 21 m/c 68h reinf tl. rim 16.5" 190/65 r 16.5 nhs SMTE.

80 100 vs 90 90 21