305/60R20 tire size
305/60R20 is a metric size: 34.4" tall, 12.0" wide, on a 20" rim — about a 34.5x12.00R20. The sidewall is 7.2" and the tire turns 586 times per mile.
305/60R20 specs
| Overall diameter (height) | 34.41" · 874 mm |
|---|---|
| Section width | 12.01" · 305 mm |
| Sidewall height | 7.20" · 183 mm (60% of width) |
| Rim diameter | 20" |
| Circumference | 108.10" · 2.746 m |
| Revolutions per mile | 586 (364 per km) |
| Inch (flotation) equivalent | 34.5x12.00R20 |
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 | |
|---|---|---|---|---|---|
| 275/60R20 common | 32.99" | -4.12% | -30 mm | 57.5 mph | calculate → |
| 275/65R20 common | 34.07" | -0.97% | -30 mm | 59.4 mph | calculate → |
| 35x12.50R20 common | 35.00" | +1.72% | +13 mm | 61.0 mph | calculate → |
| 305/55R20 common | 33.21" | -3.49% | 0 mm | 57.9 mph | calculate → |
| 285/60R20 common | 33.46" | -2.75% | -20 mm | 58.4 mph | calculate → |
| 33x12.50R20 common | 33.00" | -4.10% | +13 mm | 57.5 mph | calculate → |
| 295/60R20 | 33.94" | -1.37% | -10 mm | 59.2 mph | calculate → |
| 295/55R20 | 32.78" | -4.75% | -10 mm | 57.2 mph | calculate → |
| 295/65R20 | 35.10" | +2.00% | -10 mm | 61.2 mph | calculate → |
| 285/65R20 | 34.59" | +0.51% | -20 mm | 60.3 mph | calculate → |
| 325/60R20 | 35.35" | +2.75% | +20 mm | 61.6 mph | calculate → |
| 35x11.50R20 | 35.00" | +1.72% | -13 mm | 61.0 mph | calculate → |
| 35x13.50R20 | 35.00" | +1.72% | +38 mm | 61.0 mph | calculate → |
| 315/60R20 | 34.88" | +1.37% | +10 mm | 60.8 mph | calculate → |
| 35x15.50R20 | 35.00" | +1.72% | +89 mm | 61.0 mph | calculate → |
| 33x13.50R20 | 33.00" | -4.10% | +38 mm | 57.5 mph | calculate → |
| 33x11.50R20 | 33.00" | -4.10% | -13 mm | 57.5 mph | calculate → |
| 36x13.50R20 | 36.00" | +4.62% | +38 mm | 62.8 mph | calculate → |
| 34x11.50R20 | 34.00" | -1.19% | -13 mm | 59.3 mph | calculate → |
| 35x13.00R20 | 35.00" | +1.72% | +25 mm | 61.0 mph | calculate → |
| 35x14.50R20 | 35.00" | +1.72% | +63 mm | 61.0 mph | calculate → |
| 375/45R20 | 33.29" | -3.26% | +70 mm | 58.0 mph | calculate → |
| 285/70R20 | 35.71" | +3.78% | -20 mm | 62.3 mph | calculate → |
| 33x12.00R20 | 33.00" | -4.10% | 0 mm | 57.5 mph | calculate → |
| 33x22.00R20 | 33.00" | -4.10% | +254 mm | 57.5 mph | calculate → |
| 36x15.50R20 | 36.00" | +4.62% | +89 mm | 62.8 mph | calculate → |
| 325/50R20 | 32.80" | -4.69% | +20 mm | 57.2 mph | calculate → |
| 355/50R20 | 33.98" | -1.26% | +50 mm | 59.2 mph | calculate → |
| 33x14.50R20 | 33.00" | -4.10% | +63 mm | 57.5 mph | calculate → |
Try another size against 305/60R20
Questions
What size is 305/60R20 in inches?
305/60R20 is about 34.4" tall and 12.0" wide on a 20-inch rim — roughly a 34.5x12.00R20 in inch sizing.
What does 305/60R20 mean?
305 mm section width, sidewall 60% of the width (7.20"), radial construction, 20-inch rim.
What tire sizes are equivalent to 305/60R20?
On the same 20" rim, within 3% of the diameter: 285/65R20 (+0.51%), 275/65R20 (-0.97%), 34x11.50R20 (-1.19%), 355/50R20 (-1.26%), 295/60R20 (-1.37%), 315/60R20 (+1.37%).
How many revolutions per mile does a 305/60R20 tire make?
About 586 revolutions per mile (circumference 108.1").
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.