A 225/70R22 tire is 34.4 inches (874 mm) tall and 8.9 inches wide. The sidewall is 70% of the width, 6.2 inches, on a 22-inch wheel, and the tire turns about 586 times per mile.
In flotation terms that is about 34.4x8.9R22, closest to the common 35x12.50R22 (35.0"). People often call it a 34-inch tire.
The size most often compared with it is 245/70R22, which is 1.1" taller (+3.2%). At an indicated 60 mph you would be doing 61.9 mph on it, more than the 3% change many shops use as a limit.