305/50R20 tire size in inches
A 305/50R20 tire measures
32.0" tall × 12.0" wide
6.00" sidewall on a 20" wheel. 630 revolutions per mile.
305/50R20 means a tire 305 mm wide, with sidewalls 50% as tall as the tire is wide (153 mm), radial construction (R), for a 20 inch wheel.
305/50R20 specs
| Overall diameter (height) | 32.01 inches (813 mm) |
|---|---|
| Section width | 12.01 inches (305 mm) |
| Sidewall height | 6.00 inches (153 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 100.6 inches (2,554 mm) |
| Revolutions per mile | 630 |
| Revolutions per kilometer | 392 |
| Approximate rim width | 9.0" to 10.5" |
| In inches (flotation style) | 32.0x12.0R20 |
| Aspect ratio | 50% |
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 305/50R20 on a 20" wheel
These 20" sizes are within 3% of 305/50R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 235/65R20 | 32.03" | 9.25" | +0.1% | 60.0 mph | Compare |
| 255/60R20 | 32.05" | 10.04" | +0.1% | 60.1 mph | Compare |
| 275/55R20 | 31.91" | 10.83" | −0.3% | 59.8 mph | Compare |
| 335/45R20 | 31.87" | 13.19" | −0.4% | 59.7 mph | Compare |
| 345/45R20 | 32.22" | 13.58" | +0.7% | 60.4 mph | Compare |
| 285/55R20 | 32.34" | 11.22" | +1.0% | 60.6 mph | Compare |
| 295/50R20 | 31.61" | 11.61" | −1.2% | 59.3 mph | Compare |
| 315/50R20 | 32.40" | 12.40" | +1.2% | 60.7 mph | Compare |
| 245/60R20 | 31.57" | 9.65" | −1.4% | 59.2 mph | Compare |
| 225/65R20 | 31.52" | 8.86" | −1.5% | 59.1 mph | Compare |
| 325/45R20 | 31.52" | 12.80" | −1.5% | 59.1 mph | Compare |
| 265/60R20 | 32.52" | 10.43" | +1.6% | 61.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 32x11.50R15 | 15" | 32.00" | 0.0% | Compare |
| 275/60R19 | 19" | 31.99" | 0.0% | Compare |
| 255/40R24 | 24" | 32.03" | +0.1% | Compare |
| 255/50R22 | 22" | 32.04" | +0.1% | Compare |
| 255/55R21 | 21" | 32.04" | +0.1% | Compare |
| 255/65R19 | 19" | 32.05" | +0.1% | Compare |
| 255/70R18 | 18" | 32.06" | +0.1% | Compare |
| 255/75R17 | 17" | 32.06" | +0.2% | Compare |
| 255/80R16 | 16" | 32.06" | +0.2% | Compare |
| 255/85R15 | 15" | 32.07" | +0.2% | Compare |
| 275/65R18 | 18" | 32.07" | +0.2% | Compare |
| 325/55R18 | 18" | 32.07" | +0.2% | Compare |
One size up or down
- 295/50R20narrower: 31.6" × 11.6"
- 315/50R20wider: 32.4" × 12.4"
- 305/45R20lower profile: 30.8" × 12.0"
- 305/55R20taller sidewall: 33.2" × 12.0"
Compare 305/50R20 with another size
Questions
- How tall is a 305/50R20 tire?
- A 305/50R20 tire is 32.0 inches tall (813 mm), calculated from the size. It is 12.0 inches wide with 6.0 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 305/50R20 mean?
- 305/50R20 means a tire 305 mm wide, with sidewalls 50% as tall as the tire is wide (153 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 305/50R20 tire make?
- About 630 revolutions per mile, based on a circumference of 100.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 305/50R20 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 235/65R20 instead of 305/50R20?
- 235/65R20 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.