265/65R20 tire size in inches

A 265/65R20 tire measures

33.6" tall × 10.4" wide

6.78" sidewall on a 20" wheel. 601 revolutions per mile.

265/65R20 means a tire 265 mm wide, with sidewalls 65% as tall as the tire is wide (172 mm), radial construction (R), for a 20 inch wheel.

33.6"20" rim6.8"10.4" wide
265/65R20: 33.6 inches tall, 10.4 inches wide, on a 20 inch rim, drawn to scale

265/65R20 specs

Overall diameter (height)33.56 inches (853 mm)
Section width10.43 inches (265 mm)
Sidewall height6.78 inches (172 mm)
Wheel (rim) diameter20 inches
Circumference105.4 inches (2,678 mm)
Revolutions per mile601
Revolutions per kilometer373
Approximate rim width7.0" to 8.5"
In inches (flotation style)33.6x10.4R20
Aspect ratio65%

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 265/65R20 on a 20" wheel

These 20" sizes are within 3% of 265/65R20's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
345/50R2033.58"13.58"+0.1%60.0 mphCompare
315/55R2033.64"12.40"+0.2%60.1 mphCompare
285/60R2033.46"11.22"−0.3%59.8 mphCompare
305/55R2033.21"12.01"−1.1%59.4 mphCompare
295/60R2033.94"11.61"+1.1%60.7 mphCompare
335/50R2033.19"13.19"−1.1%59.3 mphCompare
355/50R2033.98"13.98"+1.2%60.7 mphCompare
255/65R2033.05"10.04"−1.5%59.1 mphCompare
275/65R2034.07"10.83"+1.5%60.9 mphCompare
325/55R2034.07"12.80"+1.5%60.9 mphCompare
33x12.50R2033.00"12.50"−1.7%59.0 mphCompare
275/60R2032.99"10.83"−1.7%59.0 mphCompare

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

SizeWheelDiameterDifference
355/45R2121"33.58"0.0%Compare
285/65R1919"33.59"+0.1%Compare
305/40R2424"33.61"+0.1%Compare
305/65R1818"33.61"+0.1%Compare
325/45R2222"33.52"−0.1%Compare
295/50R2222"33.61"+0.2%Compare
335/55R1919"33.51"−0.2%Compare
345/35R2424"33.51"−0.2%Compare
265/75R1818"33.65"+0.3%Compare
265/55R2222"33.48"−0.3%Compare
295/75R1616"33.42"−0.4%Compare
285/70R1818"33.71"+0.4%Compare

One size up or down

Compare 265/65R20 with another size

With 275/65R20 tires, when your speedometer says 60 mph you are really going

60.9 mph

275/65R20 is +0.51 inches (+1.5%) in overall diameter. That is within the 3% most shops and makers allow.

265/65R20275/65R20Difference%
Overall diameter33.56"34.07"+0.51"+1.5%
Section width10.43"10.83"+0.39"+3.8%
Sidewall height6.78"7.04"+0.26"+3.8%
Circumference105.44"107.05"+1.61"+1.5%
Revolutions per mile600.9591.9−9.0−1.5%

Questions

How tall is a 265/65R20 tire?
A 265/65R20 tire is 33.6 inches tall (853 mm), calculated from the size. It is 10.4 inches wide with 6.8 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 265/65R20 mean?
265/65R20 means a tire 265 mm wide, with sidewalls 65% as tall as the tire is wide (172 mm), radial construction (R), for a 20 inch wheel.
How many revolutions per mile does a 265/65R20 tire make?
About 601 revolutions per mile, based on a circumference of 105.4 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 265/65R20 tire?
Roughly 7.0" to 8.5". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 345/50R20 instead of 265/65R20?
345/50R20 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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