265/50R20 tire size in inches

A 265/50R20 tire measures

30.4" tall × 10.4" wide

5.22" sidewall on a 20" wheel. 663 revolutions per mile.

265/50R20 means a tire 265 mm wide, with sidewalls 50% as tall as the tire is wide (133 mm), radial construction (R), for a 20 inch wheel.

30.4"20" rim5.2"10.4" wide
265/50R20: 30.4 inches tall, 10.4 inches wide, on a 20 inch rim, drawn to scale

265/50R20 specs

Overall diameter (height)30.43 inches (773 mm)
Section width10.43 inches (265 mm)
Sidewall height5.22 inches (133 mm)
Wheel (rim) diameter20 inches
Circumference95.6 inches (2,428 mm)
Revolutions per mile663
Revolutions per kilometer412
Approximate rim width7.5" to 9.0"
In inches (flotation style)30.4x10.4R20
Aspect ratio50%

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 265/50R20 on a 20" wheel

These 20" sizes are within 3% of 265/50R20's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
295/45R2030.45"11.61"+0.1%60.0 mphCompare
335/40R2030.55"13.19"+0.4%60.2 mphCompare
245/55R2030.61"9.65"+0.6%60.3 mphCompare
225/60R2030.63"8.86"+0.6%60.4 mphCompare
325/40R2030.24"12.80"−0.6%59.6 mphCompare
235/55R2030.18"9.25"−0.8%59.5 mphCompare
215/60R2030.16"8.46"−0.9%59.5 mphCompare
285/45R2030.10"11.22"−1.1%59.3 mphCompare
305/45R2030.81"12.01"+1.2%60.7 mphCompare
275/50R2030.83"10.83"+1.3%60.8 mphCompare
255/50R2030.04"10.04"−1.3%59.2 mphCompare
345/40R2030.87"13.58"+1.4%60.9 mphCompare

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

SizeWheelDiameterDifference
245/80R1515"30.43"0.0%Compare
305/35R2222"30.41"−0.1%Compare
225/70R1818"30.40"−0.1%Compare
285/60R1717"30.46"+0.1%Compare
315/50R1818"30.40"−0.1%Compare
245/85R1414"30.40"−0.1%Compare
245/75R1616"30.47"+0.1%Compare
325/25R2424"30.40"−0.1%Compare
265/55R1919"30.48"+0.1%Compare
215/85R1616"30.39"−0.1%Compare
265/45R2121"30.39"−0.1%Compare
355/30R2222"30.39"−0.2%Compare

One size up or down

Compare 265/50R20 with another size

With 275/50R20 tires, when your speedometer says 60 mph you are really going

60.8 mph

275/50R20 is +0.39 inches (+1.3%) in overall diameter. That is within the 3% most shops and makers allow.

265/50R20275/50R20Difference%
Overall diameter30.43"30.83"+0.39"+1.3%
Section width10.43"10.83"+0.39"+3.8%
Sidewall height5.22"5.41"+0.20"+3.8%
Circumference95.61"96.85"+1.24"+1.3%
Revolutions per mile662.7654.2−8.5−1.3%

Questions

How tall is a 265/50R20 tire?
A 265/50R20 tire is 30.4 inches tall (773 mm), calculated from the size. It is 10.4 inches wide with 5.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 265/50R20 mean?
265/50R20 means a tire 265 mm wide, with sidewalls 50% as tall as the tire is wide (133 mm), radial construction (R), for a 20 inch wheel.
How many revolutions per mile does a 265/50R20 tire make?
About 663 revolutions per mile, based on a circumference of 95.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 265/50R20 tire?
Roughly 7.5" to 9.0". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 295/45R20 instead of 265/50R20?
295/45R20 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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