285/45R17 Tire Size in Inches

27.1" tall, 11.2" wide, 5.0" sidewall

Diameter27.1"688 mm
Overall diameter27.1"688 mm
Section width11.2"285 mm
Sidewall height5.0"128 mm
Circumference85.1"2162 mm
Revolutions per mile744462 per km
Wheel diameter17"≈ 27.1x11.2R17 in inches

A 285/45R17 tire is 27.1 inches (688 mm) tall and 11.2 inches wide. The sidewall is 45% of the width, 5.0 inches, on a 17-inch wheel, and the tire turns about 744 times per mile.

In flotation terms that is about 27.1x11.2R17. People often call it a 27-inch tire.

The size most often compared with it is 265/50R17, which is 0.3" taller (+1.2%). At an indicated 60 mph you would be doing 60.7 mph on it.

285/45R17
265/50R17
Diameter difference+1.23%diameter 27.10" → 27.43"
CurrentNew
CurrentNewDifference

Speedometer

ShowsActual speed

Gear ratio to match

–enter your current axle ratio

Sizes near 285/45R17

Same 17" wheel, within 20 mm of width and 10 points of aspect ratio.

SizeDiameterWidthSidewallvs 285/45R17
265/50R1727.4"10.4"5.2"+1.2%
305/40R1726.6"12.0"4.8"−1.8%
275/50R1727.8"10.8"5.4"+2.7%
295/40R1726.3"11.6"4.6"−3.0%
285/40R1726.0"11.2"4.5"−4.1%
275/40R1725.7"10.8"4.3"−5.3%
275/55R1728.9"10.8"6.0"+6.7%
285/55R1729.3"11.2"6.2"+8.3%
275/35R1724.6"10.8"3.8"−9.3%
305/55R1730.2"12.0"6.6"+11.5%

Same height on a different wheel

Sizes within 2% of 27.1" on 15" or 18" wheels.

SizeDiameterWidthSidewallvs 285/45R17
255/60R1527.0"10.0"6.0"−0.2%
255/45R1827.0"10.0"4.5"−0.2%
235/65R1527.0"9.3"6.0"−0.3%
305/50R1527.0"12.0"6.0"−0.3%
285/40R1827.0"11.2"4.5"−0.5%
195/80R1527.3"7.7"6.1"+0.7%

Speedometer with a different size

Actual speed when the speedometer is calibrated for 285/45R17.

Speedometer showson 265/50R17on 305/40R17on 275/50R17
30 mph30.4 mph29.5 mph30.8 mph
45 mph45.6 mph44.2 mph46.2 mph
60 mph60.7 mph58.9 mph61.6 mph
70 mph70.9 mph68.7 mph71.9 mph

285/45R17 FAQ

How tall is a 285/45R17 tire?

27.1 inches (688 mm). The sidewall is 5.0 inches.

How wide is a 285/45R17 tire?

11.2 inches (285 mm) section width, measured sidewall to sidewall.

What is 285/45R17 in flotation size?

About 27.1x11.2R17.

Can I use 265/50R17 instead of 285/45R17?

265/50R17 is +1.2% in diameter, within the common 3% guideline. It is 0.8" narrower.