295/40R20 tire size in inches

A 295/40R20 tire measures

29.3" tall × 11.6" wide

4.65" sidewall on a 20" wheel. 689 revolutions per mile.

295/40R20 means a tire 295 mm wide, with sidewalls 40% as tall as the tire is wide (118 mm), radial construction (R), for a 20 inch wheel.

29.3"20" rim4.6"11.6" wide
295/40R20: 29.3 inches tall, 11.6 inches wide, on a 20 inch rim, drawn to scale

295/40R20 specs

Overall diameter (height)29.29 inches (744 mm)
Section width11.61 inches (295 mm)
Sidewall height4.65 inches (118 mm)
Wheel (rim) diameter20 inches
Circumference92.0 inches (2,337 mm)
Revolutions per mile689
Revolutions per kilometer428
Approximate rim width9.5" to 11.0"
In inches (flotation style)29.3x11.6R20
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 295/40R20 on a 20" wheel

These 20" sizes are within 3% of 295/40R20's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
215/55R2029.31"8.46"+0.1%60.0 mphCompare
235/50R2029.25"9.25"−0.1%59.9 mphCompare
335/35R2029.23"13.19"−0.2%59.9 mphCompare
265/45R2029.39"10.43"+0.3%60.2 mphCompare
345/35R2029.51"13.58"+0.7%60.4 mphCompare
255/45R2029.04"10.04"−0.9%59.5 mphCompare
305/40R2029.61"12.01"+1.1%60.6 mphCompare
285/40R2028.98"11.22"−1.1%59.4 mphCompare
325/35R2028.96"12.80"−1.1%59.3 mphCompare
245/50R2029.65"9.65"+1.2%60.7 mphCompare
225/50R2028.86"8.86"−1.5%59.1 mphCompare
225/55R2029.74"8.86"+1.5%60.9 mphCompare

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

SizeWheelDiameterDifference
225/75R1616"29.29"0.0%Compare
205/70R1818"29.30"0.0%Compare
265/35R2222"29.30"0.0%Compare
235/45R2121"29.33"+0.1%Compare
285/55R1717"29.34"+0.2%Compare
265/40R2121"29.35"+0.2%Compare
325/40R1919"29.24"−0.2%Compare
285/50R1818"29.22"−0.2%Compare
265/25R2424"29.22"−0.3%Compare
305/30R2222"29.20"−0.3%Compare
355/30R2121"29.39"+0.3%Compare
215/85R1515"29.39"+0.3%Compare

One size up or down

Compare 295/40R20 with another size

With 305/40R20 tires, when your speedometer says 60 mph you are really going

60.6 mph

305/40R20 is +0.31 inches (+1.1%) in overall diameter. That is within the 3% most shops and makers allow.

295/40R20305/40R20Difference%
Overall diameter29.29"29.61"+0.31"+1.1%
Section width11.61"12.01"+0.39"+3.4%
Sidewall height4.65"4.80"+0.16"+3.4%
Circumference92.02"93.01"+0.99"+1.1%
Revolutions per mile688.5681.2−7.3−1.1%

Questions

How tall is a 295/40R20 tire?
A 295/40R20 tire is 29.3 inches tall (744 mm), calculated from the size. It is 11.6 inches wide with 4.6 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 295/40R20 mean?
295/40R20 means a tire 295 mm wide, with sidewalls 40% as tall as the tire is wide (118 mm), radial construction (R), for a 20 inch wheel.
How many revolutions per mile does a 295/40R20 tire make?
About 689 revolutions per mile, based on a circumference of 92.0 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 295/40R20 tire?
Roughly 9.5" to 11.0". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 215/55R20 instead of 295/40R20?
215/55R20 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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