315/50R20 tire size in inches

A 315/50R20 tire measures

32.4" tall × 12.4" wide

6.20" sidewall on a 20" wheel. 622 revolutions per mile.

315/50R20 means a tire 315 mm wide, with sidewalls 50% as tall as the tire is wide (158 mm), radial construction (R), for a 20 inch wheel.

32.4"20" rim6.2"12.4" wide
315/50R20: 32.4 inches tall, 12.4 inches wide, on a 20 inch rim, drawn to scale

315/50R20 specs

Overall diameter (height)32.40 inches (823 mm)
Section width12.40 inches (315 mm)
Sidewall height6.20 inches (158 mm)
Wheel (rim) diameter20 inches
Circumference101.8 inches (2,586 mm)
Revolutions per mile622
Revolutions per kilometer387
Approximate rim width9.0" to 10.5"
In inches (flotation style)32.4x12.4R20
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 315/50R20 on a 20" wheel

These 20" sizes are within 3% of 315/50R20's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
285/55R2032.34"11.22"−0.2%59.9 mphCompare
265/60R2032.52"10.43"+0.4%60.2 mphCompare
245/65R2032.54"9.65"+0.4%60.3 mphCompare
355/45R2032.58"13.98"+0.5%60.3 mphCompare
345/45R2032.22"13.58"−0.5%59.7 mphCompare
255/60R2032.05"10.04"−1.1%59.3 mphCompare
235/65R2032.03"9.25"−1.2%59.3 mphCompare
295/55R2032.78"11.61"+1.2%60.7 mphCompare
305/50R2032.01"12.01"−1.2%59.3 mphCompare
325/50R2032.80"12.80"+1.2%60.7 mphCompare
275/55R2031.91"10.83"−1.5%59.1 mphCompare
335/45R2031.87"13.19"−1.6%59.0 mphCompare

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

SizeWheelDiameterDifference
245/85R1616"32.40"0.0%Compare
305/35R2424"32.41"0.0%Compare
305/60R1818"32.41"0.0%Compare
355/30R2424"32.39"0.0%Compare
265/50R2222"32.43"+0.1%Compare
295/45R2222"32.45"+0.2%Compare
265/40R2424"32.35"−0.2%Compare
285/60R1919"32.46"+0.2%Compare
245/75R1818"32.47"+0.2%Compare
265/55R2121"32.48"+0.2%Compare
275/80R1515"32.32"−0.2%Compare
335/55R1818"32.51"+0.3%Compare

One size up or down

Compare 315/50R20 with another size

With 325/50R20 tires, when your speedometer says 60 mph you are really going

60.7 mph

325/50R20 is +0.39 inches (+1.2%) in overall diameter. That is within the 3% most shops and makers allow.

315/50R20325/50R20Difference%
Overall diameter32.40"32.80"+0.39"+1.2%
Section width12.40"12.80"+0.39"+3.2%
Sidewall height6.20"6.40"+0.20"+3.2%
Circumference101.79"103.03"+1.24"+1.2%
Revolutions per mile622.4615.0−7.5−1.2%

Questions

How tall is a 315/50R20 tire?
A 315/50R20 tire is 32.4 inches tall (823 mm), calculated from the size. It is 12.4 inches wide with 6.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 315/50R20 mean?
315/50R20 means a tire 315 mm wide, with sidewalls 50% as tall as the tire is wide (158 mm), radial construction (R), for a 20 inch wheel.
How many revolutions per mile does a 315/50R20 tire make?
About 622 revolutions per mile, based on a circumference of 101.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 315/50R20 tire?
Roughly 9.0" to 10.5". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 285/55R20 instead of 315/50R20?
285/55R20 is −0.06 inches (−0.2%) in overall diameter, so at an indicated 60 mph you would be doing 59.9 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.

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