305/35R20 tire size in inches
A 305/35R20 tire measures
28.4" tall × 12.0" wide
4.20" sidewall on a 20" wheel. 710 revolutions per mile.
305/35R20 means a tire 305 mm wide, with sidewalls 35% as tall as the tire is wide (107 mm), radial construction (R), for a 20 inch wheel.
305/35R20 specs
| Overall diameter (height) | 28.41 inches (722 mm) |
|---|---|
| Section width | 12.01 inches (305 mm) |
| Sidewall height | 4.20 inches (107 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 89.2 inches (2,267 mm) |
| Revolutions per mile | 710 |
| Revolutions per kilometer | 441 |
| Approximate rim width | 10.0" to 11.5" |
| In inches (flotation style) | 28.4x12.0R20 |
| Aspect ratio | 35% |
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 305/35R20 on a 20" wheel
These 20" sizes are within 3% of 305/35R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 355/30R20 | 28.39" | 13.98" | −0.1% | 60.0 mph | Compare |
| 215/50R20 | 28.46" | 8.46" | +0.2% | 60.1 mph | Compare |
| 265/40R20 | 28.35" | 10.43" | −0.2% | 59.9 mph | Compare |
| 235/45R20 | 28.33" | 9.25" | −0.3% | 59.8 mph | Compare |
| 275/40R20 | 28.66" | 10.83" | +0.9% | 60.5 mph | Compare |
| 345/30R20 | 28.15" | 13.58" | −0.9% | 59.5 mph | Compare |
| 245/45R20 | 28.68" | 9.65" | +1.0% | 60.6 mph | Compare |
| 295/35R20 | 28.13" | 11.61" | −1.0% | 59.4 mph | Compare |
| 315/35R20 | 28.68" | 12.40" | +1.0% | 60.6 mph | Compare |
| 255/40R20 | 28.03" | 10.04" | −1.3% | 59.2 mph | Compare |
| 225/45R20 | 27.97" | 8.86" | −1.5% | 59.1 mph | Compare |
| 225/50R20 | 28.86" | 8.86" | +1.6% | 61.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 225/70R16 | 16" | 28.40" | 0.0% | Compare |
| 235/40R21 | 21" | 28.40" | 0.0% | Compare |
| 325/25R22 | 22" | 28.40" | 0.0% | Compare |
| 215/85R14 | 14" | 28.39" | −0.1% | Compare |
| 265/45R19 | 19" | 28.39" | −0.1% | Compare |
| 185/85R16 | 16" | 28.38" | −0.1% | Compare |
| 245/80R13 | 13" | 28.43" | +0.1% | Compare |
| 265/50R18 | 18" | 28.43" | +0.1% | Compare |
| 315/30R21 | 21" | 28.44" | +0.1% | Compare |
| 295/45R18 | 18" | 28.45" | +0.2% | Compare |
| 285/60R15 | 15" | 28.46" | +0.2% | Compare |
| 245/75R14 | 14" | 28.47" | +0.2% | Compare |
One size up or down
- 295/35R20narrower: 28.1" × 11.6"
- 315/35R20wider: 28.7" × 12.4"
- 305/30R20lower profile: 27.2" × 12.0"
- 305/40R20taller sidewall: 29.6" × 12.0"
Compare 305/35R20 with another size
Questions
- How tall is a 305/35R20 tire?
- A 305/35R20 tire is 28.4 inches tall (722 mm), calculated from the size. It is 12.0 inches wide with 4.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 305/35R20 mean?
- 305/35R20 means a tire 305 mm wide, with sidewalls 35% as tall as the tire is wide (107 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 305/35R20 tire make?
- About 710 revolutions per mile, based on a circumference of 89.2 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 305/35R20 tire?
- Roughly 10.0" to 11.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 355/30R20 instead of 305/35R20?
- 355/30R20 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.