205/40R16 tire size in inches

A 205/40R16 tire measures

22.5" tall × 8.1" wide

3.23" sidewall on a 16" wheel. 898 revolutions per mile.

205/40R16 means a tire 205 mm wide, with sidewalls 40% as tall as the tire is wide (82 mm), radial construction (R), for a 16 inch wheel.

22.5"16" rim3.2"8.1" wide
205/40R16: 22.5 inches tall, 8.1 inches wide, on a 16 inch rim, drawn to scale

205/40R16 specs

Overall diameter (height)22.46 inches (570 mm)
Section width8.07 inches (205 mm)
Sidewall height3.23 inches (82 mm)
Wheel (rim) diameter16 inches
Circumference70.5 inches (1,792 mm)
Revolutions per mile898
Revolutions per kilometer558
Approximate rim width6.5" to 8.0"
In inches (flotation style)22.5x8.1R16
Aspect ratio40%

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 205/40R16 on a 16" wheel

These 16" sizes are within 3% of 205/40R16's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
185/45R1622.56"7.28"+0.4%60.3 mphCompare
195/40R1622.14"7.68"−1.4%59.2 mphCompare
215/40R1622.77"8.46"+1.4%60.8 mphCompare
195/45R1622.91"7.68"+2.0%61.2 mphCompare
225/40R1623.09"8.86"+2.8%61.7 mphCompare

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

SizeWheelDiameterDifference
165/65R1414"22.44"−0.1%Compare
185/65R1313"22.47"+0.1%Compare
195/55R1414"22.44"−0.1%Compare
195/35R1717"22.37"−0.4%Compare
155/70R1414"22.54"+0.4%Compare
175/55R1515"22.58"+0.5%Compare
215/45R1515"22.62"+0.7%Compare
185/50R1515"22.28"−0.8%Compare
175/60R1414"22.27"−0.8%Compare
175/70R1313"22.65"+0.8%Compare
205/45R1515"22.26"−0.9%Compare
205/35R1717"22.65"+0.9%Compare

One size up or down

Compare 205/40R16 with another size

With 215/40R16 tires, when your speedometer says 60 mph you are really going

60.8 mph

215/40R16 is +0.31 inches (+1.4%) in overall diameter. That is within the 3% most shops and makers allow.

205/40R16215/40R16Difference%
Overall diameter22.46"22.77"+0.31"+1.4%
Section width8.07"8.46"+0.39"+4.9%
Sidewall height3.23"3.39"+0.16"+4.9%
Circumference70.55"71.54"+0.99"+1.4%
Revolutions per mile898.1885.7−12.4−1.4%

Questions

How tall is a 205/40R16 tire?
A 205/40R16 tire is 22.5 inches tall (570 mm), calculated from the size. It is 8.1 inches wide with 3.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 205/40R16 mean?
205/40R16 means a tire 205 mm wide, with sidewalls 40% as tall as the tire is wide (82 mm), radial construction (R), for a 16 inch wheel.
How many revolutions per mile does a 205/40R16 tire make?
About 898 revolutions per mile, based on a circumference of 70.5 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 205/40R16 tire?
Roughly 6.5" to 8.0". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 185/45R16 instead of 205/40R16?
185/45R16 is +0.10 inches (+0.4%) in overall diameter, so at an indicated 60 mph you would be doing 60.3 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.

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