37-inch tires
A 37-inch tire is about 37 inches tall. In metric, the closest size is 285/75R20 (36.8 in).
"37s" is shorthand for any tire close to 37 inches tall. Inch sizes say it outright; metric sizes get there from width and sidewall, so each rim size has its own set. The bars below are drawn to the same scale, so you can see which ones really are 37 inches.
37x inch sizes
Metric sizes about 37 inches tall
20-inch rims
37-inch tire questions
What size is a 37-inch tire in metric?
It depends on the rim. On a 20-inch rim, 285/75R20 is 36.8 inches tall.
Is a 37x12.50 the same as a metric 37?
Not quite. 37x12.50R17 is a true 37 inches tall and 12.5 inches wide, while metric "37s" range from 36.8 to 36.8 inches and are usually narrower.
Will 37-inch tires change my speedometer?
Yes, if they are taller or shorter than the size you have now. Going from a 31.6-inch 265/70R17 to a 37-inch tire changes the reading by about 17.1%. Put your own size into the tire size calculator to see the exact change.