245/35R20 tire size

A 245/35R20 tire is 26.8 inches (680 mm) tall and 9.6 inches (245 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 26.8x9.6R20.

Overall diameter26.75in680 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
225/55R17	26.7″	−0.0%	8.9″	4.9″	17″
245/40R19	26.7″	−0.1%	9.6″	3.9″	19″
215/75R14	26.7″	−0.2%	8.5″	6.3″	14″
245/45R18	26.7″	−0.3%	9.6″	4.3″	18″
275/40R18	26.7″	−0.3%	10.8″	4.3″	18″
215/70R15	26.9″	+0.4%	8.5″	5.9″	15″
225/60R16	26.6″	−0.5%	8.9″	5.3″	16″
275/35R19	26.6″	−0.6%	10.8″	3.8″	19″
225/45R19	27.0″	+0.8%	8.9″	4.0″	19″
215/65R16	27.0″	+0.9%	8.5″	5.5″	16″
205/65R16	26.5″	−1.0%	8.1″	5.2″	16″
235/35R20	26.5″	−1.0%	9.3″	3.2″	20″

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

245: Section width: 245 mm (9.6 in) from sidewall to sidewall.
35: Aspect ratio: the sidewall is 35% as tall as the tire is wide, 86 mm (3.4 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

245/35R20 is about 26.8 inches tall and 9.6 inches wide, on a 20-inch wheel, roughly a 26.8x9.6R20 in inch sizing.

Yes. At 26.8 inches it is sold and fitted as a 27-inch tire.

225/55R17, 245/40R19, 215/75R14 are the closest common sizes, all within 0.2% of its diameter, so the speedometer stays close to accurate.

245/40R20 is 3.6% taller, so at an indicated 60 mph you would really be doing 62.2 mph. Compare 245/35R20 and 245/40R20.

About 754 per mile (468 per km), from a 84.0-inch circumference.