305/60R20 tire size in inches
A 305/60R20 tire measures
34.4" tall × 12.0" wide
7.20" sidewall on a 20" wheel. 586 revolutions per mile.
305/60R20 means a tire 305 mm wide, with sidewalls 60% as tall as the tire is wide (183 mm), radial construction (R), for a 20 inch wheel.
305/60R20 specs
| Overall diameter (height) | 34.41 inches (874 mm) |
|---|---|
| Section width | 12.01 inches (305 mm) |
| Sidewall height | 7.20 inches (183 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 108.1 inches (2,746 mm) |
| Revolutions per mile | 586 |
| Revolutions per kilometer | 364 |
| Approximate rim width | 8.0" to 9.5" |
| In inches (flotation style) | 34.4x12.0R20 |
| Aspect ratio | 60% |
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 305/60R20 on a 20" wheel
These 20" sizes are within 3% of 305/60R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 335/55R20 | 34.51" | 13.19" | +0.3% | 60.2 mph | Compare |
| 285/65R20 | 34.59" | 11.22" | +0.5% | 60.3 mph | Compare |
| 275/65R20 | 34.07" | 10.83" | −1.0% | 59.4 mph | Compare |
| 325/55R20 | 34.07" | 12.80" | −1.0% | 59.4 mph | Compare |
| 355/50R20 | 33.98" | 13.98" | −1.3% | 59.2 mph | Compare |
| 295/60R20 | 33.94" | 11.61" | −1.4% | 59.2 mph | Compare |
| 315/60R20 | 34.88" | 12.40" | +1.4% | 60.8 mph | Compare |
| 345/55R20 | 34.94" | 13.58" | +1.5% | 60.9 mph | Compare |
| 35x12.50R20 | 35.00" | 12.50" | +1.7% | 61.0 mph | Compare |
| 295/65R20 | 35.10" | 11.61" | +2.0% | 61.2 mph | Compare |
| 315/55R20 | 33.64" | 12.40" | −2.2% | 58.7 mph | Compare |
| 345/50R20 | 33.58" | 13.58" | −2.4% | 58.6 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 275/85R16 | 16" | 34.41" | 0.0% | Compare |
| 315/50R22 | 22" | 34.40" | 0.0% | Compare |
| 295/75R17 | 17" | 34.42" | 0.0% | Compare |
| 355/55R19 | 19" | 34.37" | −0.1% | Compare |
| 315/70R17 | 17" | 34.36" | −0.1% | Compare |
| 325/60R19 | 19" | 34.35" | −0.2% | Compare |
| 285/55R22 | 22" | 34.34" | −0.2% | Compare |
| 335/40R24 | 24" | 34.55" | +0.4% | Compare |
| 295/70R18 | 18" | 34.26" | −0.4% | Compare |
| 275/75R18 | 18" | 34.24" | −0.5% | Compare |
| 355/45R22 | 22" | 34.58" | +0.5% | Compare |
| 325/40R24 | 24" | 34.24" | −0.5% | Compare |
One size up or down
- 295/60R20narrower: 33.9" × 11.6"
- 315/60R20wider: 34.9" × 12.4"
- 305/55R20lower profile: 33.2" × 12.0"
- 305/65R20taller sidewall: 35.6" × 12.0"
Compare 305/60R20 with another size
Questions
- How tall is a 305/60R20 tire?
- A 305/60R20 tire is 34.4 inches tall (874 mm), calculated from the size. It is 12.0 inches wide with 7.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 305/60R20 mean?
- 305/60R20 means a tire 305 mm wide, with sidewalls 60% as tall as the tire is wide (183 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 305/60R20 tire make?
- About 586 revolutions per mile, based on a circumference of 108.1 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 305/60R20 tire?
- Roughly 8.0" to 9.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 335/55R20 instead of 305/60R20?
- 335/55R20 is +0.10 inches (+0.3%) in overall diameter, so at an indicated 60 mph you would be doing 60.2 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.