315/60R20 tire size
315/60R20 is a metric size: 34.9" tall, 12.4" wide, on a 20" rim — about a 35x12.50R20. The sidewall is 7.4" and the tire turns 578 times per mile.
315/60R20 specs
| Overall diameter (height) | 34.88" · 886 mm |
|---|---|
| Section width | 12.40" · 315 mm |
| Sidewall height | 7.44" · 189 mm (60% of width) |
| Rim diameter | 20" |
| Circumference | 109.58" · 2.783 m |
| Revolutions per mile | 578 (359 per km) |
| Inch (flotation) equivalent | 35x12.50R20 |
Equivalent sizes on a 20" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 275/65R20 common | 34.07" | -2.31% | -40 mm | 58.6 mph | calculate → |
| 35x12.50R20 common | 35.00" | +0.34% | +3 mm | 60.2 mph | calculate → |
| 305/55R20 common | 33.21" | -4.80% | -10 mm | 57.1 mph | calculate → |
| 285/60R20 common | 33.46" | -4.06% | -30 mm | 57.6 mph | calculate → |
| 295/60R20 | 33.94" | -2.71% | -20 mm | 58.4 mph | calculate → |
| 295/65R20 | 35.10" | +0.62% | -20 mm | 60.4 mph | calculate → |
| 285/65R20 | 34.59" | -0.85% | -30 mm | 59.5 mph | calculate → |
| 325/60R20 | 35.35" | +1.35% | +10 mm | 60.8 mph | calculate → |
| 35x11.50R20 | 35.00" | +0.34% | -23 mm | 60.2 mph | calculate → |
| 35x13.50R20 | 35.00" | +0.34% | +28 mm | 60.2 mph | calculate → |
| 35x15.50R20 | 35.00" | +0.34% | +79 mm | 60.2 mph | calculate → |
| 36x13.50R20 | 36.00" | +3.21% | +28 mm | 61.9 mph | calculate → |
| 35x13.00R20 | 35.00" | +0.34% | +15 mm | 60.2 mph | calculate → |
| 35x14.50R20 | 35.00" | +0.34% | +53 mm | 60.2 mph | calculate → |
| 305/60R20 | 34.41" | -1.35% | -10 mm | 59.2 mph | calculate → |
| 285/70R20 | 35.71" | +2.37% | -30 mm | 61.4 mph | calculate → |
| 34x11.50R20 | 34.00" | -2.53% | -23 mm | 58.5 mph | calculate → |
| 36x15.50R20 | 36.00" | +3.21% | +79 mm | 61.9 mph | calculate → |
| 375/55R20 | 36.24" | +3.89% | +60 mm | 62.3 mph | calculate → |
| 375/45R20 | 33.29" | -4.57% | +60 mm | 57.3 mph | calculate → |
| 355/50R20 | 33.98" | -2.60% | +40 mm | 58.4 mph | calculate → |
| 345/60R20 | 36.30" | +4.06% | +30 mm | 62.4 mph | calculate → |
Try another size against 315/60R20
Questions
What size is 315/60R20 in inches?
315/60R20 is about 34.9" tall and 12.4" wide on a 20-inch rim — roughly a 35x12.50R20 in inch sizing.
What does 315/60R20 mean?
315 mm section width, sidewall 60% of the width (7.44"), radial construction, 20-inch rim.
What tire sizes are equivalent to 315/60R20?
On the same 20" rim, within 3% of the diameter: 35x11.50R20 (+0.34%), 35x12.50R20 (+0.34%), 35x13.50R20 (+0.34%), 35x13.00R20 (+0.34%), 35x14.50R20 (+0.34%), 35x15.50R20 (+0.34%).
How many revolutions per mile does a 315/60R20 tire make?
About 578 revolutions per mile (circumference 109.6").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.