275/45R17 tire size in inches

A 275/45R17 tire measures

26.7" tall × 10.8" wide

4.87" sidewall on a 17" wheel. 754 revolutions per mile.

275/45R17 means a tire 275 mm wide, with sidewalls 45% as tall as the tire is wide (124 mm), radial construction (R), for a 17 inch wheel.

26.7"17" rim4.9"10.8" wide
275/45R17: 26.7 inches tall, 10.8 inches wide, on a 17 inch rim, drawn to scale

275/45R17 specs

Overall diameter (height)26.74 inches (679 mm)
Section width10.83 inches (275 mm)
Sidewall height4.87 inches (124 mm)
Wheel (rim) diameter17 inches
Circumference84.0 inches (2,134 mm)
Revolutions per mile754
Revolutions per kilometer469
Approximate rim width9.0" to 10.5"
In inches (flotation style)26.7x10.8R17
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 275/45R17 on a 17" wheel

These 17" sizes are within 3% of 275/45R17's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
225/55R1726.74"8.86"0.0%60.0 mphCompare
205/60R1726.69"8.07"−0.2%59.9 mphCompare
245/50R1726.65"9.65"−0.4%59.8 mphCompare
305/40R1726.61"12.01"−0.5%59.7 mphCompare
315/40R1726.92"12.40"+0.7%60.4 mphCompare
195/65R1726.98"7.68"+0.9%60.5 mphCompare
185/65R1726.47"7.28"−1.0%59.4 mphCompare
255/50R1727.04"10.04"+1.1%60.7 mphCompare
285/45R1727.10"11.22"+1.3%60.8 mphCompare
265/45R1726.39"10.43"−1.3%59.2 mphCompare
215/60R1727.16"8.46"+1.5%60.9 mphCompare
215/55R1726.31"8.46"−1.6%59.0 mphCompare

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

SizeWheelDiameterDifference
195/70R1616"26.75"0.0%Compare
245/35R2020"26.75"0.0%Compare
285/30R2020"26.73"0.0%Compare
205/85R1313"26.72"−0.1%Compare
215/40R2020"26.77"+0.1%Compare
245/40R1919"26.72"−0.1%Compare
175/85R1515"26.71"−0.1%Compare
245/30R2121"26.79"+0.2%Compare
215/75R1414"26.70"−0.2%Compare
345/25R2020"26.79"+0.2%Compare
245/45R1818"26.68"−0.2%Compare
295/25R2121"26.81"+0.2%Compare

One size up or down

Compare 275/45R17 with another size

With 285/45R17 tires, when your speedometer says 60 mph you are really going

60.8 mph

285/45R17 is +0.35 inches (+1.3%) in overall diameter. That is within the 3% most shops and makers allow.

275/45R17285/45R17Difference%
Overall diameter26.74"27.10"+0.35"+1.3%
Section width10.83"11.22"+0.39"+3.6%
Sidewall height4.87"5.05"+0.18"+3.6%
Circumference84.02"85.13"+1.11"+1.3%
Revolutions per mile754.1744.3−9.9−1.3%

Questions

How tall is a 275/45R17 tire?
A 275/45R17 tire is 26.7 inches tall (679 mm), calculated from the size. It is 10.8 inches wide with 4.9 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 275/45R17 mean?
275/45R17 means a tire 275 mm wide, with sidewalls 45% as tall as the tire is wide (124 mm), radial construction (R), for a 17 inch wheel.
How many revolutions per mile does a 275/45R17 tire make?
About 754 revolutions per mile, based on a circumference of 84.0 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 275/45R17 tire?
Roughly 9.0" to 10.5". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 225/55R17 instead of 275/45R17?
225/55R17 is 0.00 inches (0.0%) 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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