If you are measuring the diameter of the ring (which one can assume given the size) then it is about a 10 1/4 ring size.
A 20.2 mm is a 10.5 in the US while a 19.8 is a 10. The sizes are different by country. Refer to the ring size chart in the links below if you need the sizes for different countries.
52.8 mm
3 mm.
16.51 mm inside diameter
8.73 mm
show me 21 mm on ruler
The answer will depend on the units. 20 mm x 8 mm is quite a different size from 20 miles x 8 miles.
3.5 inches is 88.9 millimeters.
i believe you mean US sizes Diam = 20.7 mm Circum = 64.1 mm
The CORRECT Size is 36 MM (for my) 2004 Hayabusa) June 29, 20
about 30mm x 20 mm. easy.
5 mm is about 1/5". About the diameter of a pea.
knowing the size of a wrestling ring depends on the shape of the ring, if it square then it is 18 feet, if it is an hexagon then it is 20 - 21 feet wide.