The United States is on course to reach 90-90-90 goals in the near future, with 86% of persons with HIV aware of their infection, 74% of persons with diagnosed infection in care, and 83% of persons in care with viral suppression in 2016. Some high-burden subnational jurisdictions have already achieved these goals.

100/80-R10 tires are 0.79 inches (20 mm) smaller in diameter than 100/90-R10 tires and the speedometer difference is 4.6%. So 2.75x18 and 3x18 means 2.75 inches and 3 inches wide tires. In case of 80/100, it is 80 mm wide. And other people on Reddit itself said 2.75x18 and 80/100 have same width. They are just having different naming systems. I found these two tire naming in 2 different motorcycles (110 cc). Both had almost same specs. 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%.
Feb 7, 2019 · If it's TKC80 then it's 90/90-21 and 120/90-18. Those are good sizes to stick with although I had to go with 110/100-18 for the rear as this is a much more common size. The sizes listed in the manual are for the Metzeler 6 Days tires they come with in Europe and a 140/80-18 is honestly too wide. Edited February 7, 2019 by pnw_obrigade
90/90-R21 tires are 0.24 inches (6 mm) smaller in diameter than 120/70-R21 tires and the speedometer difference is 0.9%. CEBRFb.
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    • 80 100 vs 90 90 21