235/45R19 tire size in inches

A 235/45R19 tire measures

27.3" tall × 9.3" wide

4.16" sidewall on a 19" wheel. 738 revolutions per mile.

235/45R19 means a tire 235 mm wide, with sidewalls 45% as tall as the tire is wide (106 mm), radial construction (R), for a 19 inch wheel.

27.3"19" rim4.2"9.3" wide
235/45R19: 27.3 inches tall, 9.3 inches wide, on a 19 inch rim, drawn to scale

235/45R19 specs

Overall diameter (height)27.33 inches (694 mm)
Section width9.25 inches (235 mm)
Sidewall height4.16 inches (106 mm)
Wheel (rim) diameter19 inches
Circumference85.8 inches (2,181 mm)
Revolutions per mile738
Revolutions per kilometer459
Approximate rim width7.5" to 9.0"
In inches (flotation style)27.3x9.3R19
Aspect ratio45%

Calculated from the size. Real tires differ by brand, model and tread depth, typically by a few tenths of an inch.

Sizes that can replace 235/45R19 on a 19" wheel

These 19" sizes are within 3% of 235/45R19's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
265/40R1927.35"10.43"+0.1%60.0 mphCompare
355/30R1927.39"13.98"+0.2%60.1 mphCompare
305/35R1927.41"12.01"+0.3%60.2 mphCompare
215/50R1927.46"8.46"+0.5%60.3 mphCompare
345/30R1927.15"13.58"−0.6%59.6 mphCompare
295/35R1927.13"11.61"−0.7%59.6 mphCompare
205/50R1927.07"8.07"−0.9%59.4 mphCompare
255/40R1927.03"10.04"−1.1%59.4 mphCompare
275/40R1927.66"10.83"+1.2%60.7 mphCompare
225/45R1926.97"8.86"−1.3%59.2 mphCompare
245/45R1927.68"9.65"+1.3%60.8 mphCompare
315/35R1927.68"12.40"+1.3%60.8 mphCompare

Same height on other wheel sizes (plus and minus sizing)

SizeWheelDiameterDifference
215/55R1818"27.31"−0.1%Compare
285/55R1515"27.34"+0.1%Compare
265/35R2020"27.30"−0.1%Compare
205/70R1616"27.30"−0.1%Compare
295/40R1818"27.29"−0.1%Compare
225/75R1414"27.29"−0.1%Compare
195/80R1515"27.28"−0.2%Compare
185/85R1515"27.38"+0.2%Compare
215/85R1313"27.39"+0.2%Compare
265/45R1818"27.39"+0.2%Compare
265/30R2121"27.26"−0.2%Compare
325/25R2121"27.40"+0.3%Compare

One size up or down

Compare 235/45R19 with another size

With 245/45R19 tires, when your speedometer says 60 mph you are really going

60.8 mph

245/45R19 is +0.35 inches (+1.3%) in overall diameter. That is within the 3% most shops and makers allow.

235/45R19245/45R19Difference%
Overall diameter27.33"27.68"+0.35"+1.3%
Section width9.25"9.65"+0.39"+4.3%
Sidewall height4.16"4.34"+0.18"+4.3%
Circumference85.85"86.96"+1.11"+1.3%
Revolutions per mile738.0728.6−9.4−1.3%

Questions

How tall is a 235/45R19 tire?
A 235/45R19 tire is 27.3 inches tall (694 mm), calculated from the size. It is 9.3 inches wide with 4.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 235/45R19 mean?
235/45R19 means a tire 235 mm wide, with sidewalls 45% as tall as the tire is wide (106 mm), radial construction (R), for a 19 inch wheel.
How many revolutions per mile does a 235/45R19 tire make?
About 738 revolutions per mile, based on a circumference of 85.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 235/45R19 tire?
Roughly 7.5" to 9.0". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 265/40R19 instead of 235/45R19?
265/40R19 is +0.02 inches (+0.1%) in overall diameter, so at an indicated 60 mph you would be doing 60.0 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.

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