185/75R14 tire size in inches

A 185/75R14 tire measures

24.9" tall × 7.3" wide

5.46" sidewall on a 14" wheel. 809 revolutions per mile.

185/75R14 means a tire 185 mm wide, with sidewalls 75% as tall as the tire is wide (139 mm), radial construction (R), for a 14 inch wheel.

24.9"14" rim5.5"7.3" wide
185/75R14: 24.9 inches tall, 7.3 inches wide, on a 14 inch rim, drawn to scale

185/75R14 specs

Overall diameter (height)24.93 inches (633 mm)
Section width7.28 inches (185 mm)
Sidewall height5.46 inches (139 mm)
Wheel (rim) diameter14 inches
Circumference78.3 inches (1,989 mm)
Revolutions per mile809
Revolutions per kilometer503
Approximate rim width5.0" to 6.5"
In inches (flotation style)24.9x7.3R14
Aspect ratio75%

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 185/75R14 on a 14" wheel

These 14" sizes are within 3% of 185/75R14's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
215/65R1425.00"8.46"+0.3%60.2 mphCompare
175/80R1425.02"6.89"+0.4%60.2 mphCompare
165/85R1425.04"6.50"+0.5%60.3 mphCompare
255/55R1425.04"10.04"+0.5%60.3 mphCompare
235/60R1425.10"9.25"+0.7%60.4 mphCompare
195/70R1424.75"7.68"−0.7%59.6 mphCompare
225/60R1424.63"8.86"−1.2%59.3 mphCompare
245/55R1424.61"9.65"−1.3%59.2 mphCompare
205/70R1425.30"8.07"+1.5%60.9 mphCompare
205/65R1424.49"8.07"−1.7%59.0 mphCompare
165/80R1424.39"6.50"−2.1%58.7 mphCompare
265/55R1425.48"10.43"+2.2%61.3 mphCompare

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

SizeWheelDiameterDifference
215/35R1919"24.93"0.0%Compare
195/45R1818"24.91"−0.1%Compare
175/65R1616"24.96"+0.1%Compare
225/45R1717"24.97"+0.2%Compare
205/55R1616"24.88"−0.2%Compare
285/40R1616"24.98"+0.2%Compare
195/65R1515"24.98"+0.2%Compare
225/50R1616"24.86"−0.3%Compare
285/35R1717"24.85"−0.3%Compare
215/70R1313"24.85"−0.3%Compare
305/25R1919"25.00"+0.3%Compare
185/55R1717"25.01"+0.3%Compare

One size up or down

Compare 185/75R14 with another size

With 195/75R14 tires, when your speedometer says 60 mph you are really going

61.4 mph

195/75R14 is +0.59 inches (+2.4%) in overall diameter. That is within the 3% most shops and makers allow.

185/75R14195/75R14Difference%
Overall diameter24.93"25.52"+0.59"+2.4%
Section width7.28"7.68"+0.39"+5.4%
Sidewall height5.46"5.76"+0.30"+5.4%
Circumference78.30"80.16"+1.86"+2.4%
Revolutions per mile809.1790.4−18.7−2.3%

Questions

How tall is a 185/75R14 tire?
A 185/75R14 tire is 24.9 inches tall (633 mm), calculated from the size. It is 7.3 inches wide with 5.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 185/75R14 mean?
185/75R14 means a tire 185 mm wide, with sidewalls 75% as tall as the tire is wide (139 mm), radial construction (R), for a 14 inch wheel.
How many revolutions per mile does a 185/75R14 tire make?
About 809 revolutions per mile, based on a circumference of 78.3 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 185/75R14 tire?
Roughly 5.0" to 6.5". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 215/65R14 instead of 185/75R14?
215/65R14 is +0.08 inches (+0.3%) in overall diameter, so at an indicated 60 mph you would be doing 60.2 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.

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