245/40R19 tire size

A 245/40R19 tire is 26.7 inches (679 mm) tall and 9.6 inches (245 mm) wide, and fits a 19-inch wheel. In inch sizing it is about a 26.7x9.6R19.

Overall diameter26.72in679 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
215/75R14	26.7″	−0.1%	8.5″	6.3″	14″
225/55R17	26.7″	+0.1%	8.9″	4.9″	17″
245/45R18	26.7″	−0.1%	9.6″	4.3″	18″
245/35R20	26.8″	+0.1%	9.6″	3.4″	20″
275/40R18	26.7″	−0.2%	10.8″	4.3″	18″
225/60R16	26.6″	−0.3%	8.9″	5.3″	16″
215/70R15	26.9″	+0.5%	8.5″	5.9″	15″
275/35R19	26.6″	−0.5%	10.8″	3.8″	19″
205/65R16	26.5″	−0.8%	8.1″	5.2″	16″
235/35R20	26.5″	−0.9%	9.3″	3.2″	20″
225/45R19	27.0″	+1.0%	8.9″	4.0″	19″
215/65R16	27.0″	+1.1%	8.5″	5.5″	16″

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.
40: Aspect ratio: the sidewall is 40% as tall as the tire is wide, 98 mm (3.9 in).
R: Radial construction, used by almost every modern tire.
19: Fits a 19-inch wheel.

245/40R19 is about 26.7 inches tall and 9.6 inches wide, on a 19-inch wheel, roughly a 26.7x9.6R19 in inch sizing.

Yes. At 26.7 inches it is sold and fitted as a 27-inch tire.

215/75R14, 225/55R17, 245/45R18 are the closest common sizes, all within 0.1% of its diameter, so the speedometer stays close to accurate.

275/40R19 is 3.5% taller, so at an indicated 60 mph you would really be doing 62.1 mph. Compare 245/40R19 and 275/40R19.

About 755 per mile (469 per km), from a 83.9-inch circumference.