305/45R22 tire size

A 305/45R22 tire is 32.8 inches (833 mm) tall and 12.0 inches (305 mm) wide, and fits a 22-inch wheel. In inch sizing it is about a 32.8x12.0R22.

Overall diameter32.81in833 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
305/70R16	32.8″	+0.0%	12.0″	8.4″	16″
285/75R16	32.8″	+0.1%	11.2″	8.4″	16″
295/55R20	32.8″	−0.1%	11.6″	6.4″	20″
285/70R17	32.7″	−0.3%	11.2″	7.9″	17″
275/60R20	33.0″	+0.6%	10.8″	6.5″	20″
33x12.50R15	33.0″	+0.6%	12.5″	9.0″	15″
33x12.50R17	33.0″	+0.6%	12.5″	8.0″	17″
33x12.50R18	33.0″	+0.6%	12.5″	7.5″	18″
33x12.50R20	33.0″	+0.6%	12.5″	6.5″	20″
265/70R18	32.6″	−0.6%	10.4″	7.3″	18″
285/65R18	32.6″	−0.7%	11.2″	7.3″	18″
275/70R18	33.2″	+1.1%	10.8″	7.6″	18″

Within 3% of the original diameter is the range most tire shops treat as a direct swap. Check load index and clearance too.

305: Section width: 305 mm (12.0 in) from sidewall to sidewall.
45: Aspect ratio: the sidewall is 45% as tall as the tire is wide, 137 mm (5.4 in).
R: Radial construction, used by almost every modern tire.
22: Fits a 22-inch wheel.

305/45R22 is about 32.8 inches tall and 12.0 inches wide, on a 22-inch wheel, roughly a 32.8x12.0R22 in inch sizing.

Yes. At 32.8 inches it is sold and fitted as a 33-inch tire.

305/70R16, 285/75R16, 295/55R20 are the closest common sizes, all within 0.1% of its diameter, so the speedometer stays close to accurate.

35x12.50R22 is 6.7% taller, so at an indicated 60 mph you would really be doing 64.0 mph. Compare 305/45R22 and 35x12.50R22.

About 615 per mile (382 per km), from a 103.1-inch circumference.