245/50R21 tire size in inches
A 245/50R21 tire measures
30.6" tall × 9.6" wide
4.82" sidewall on a 21" wheel. 658 revolutions per mile.
245/50R21 means a tire 245 mm wide, with sidewalls 50% as tall as the tire is wide (123 mm), radial construction (R), for a 21 inch wheel.
245/50R21 specs
| Overall diameter (height) | 30.65 inches (778 mm) |
|---|---|
| Section width | 9.65 inches (245 mm) |
| Sidewall height | 4.82 inches (123 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 96.3 inches (2,445 mm) |
| Revolutions per mile | 658 |
| Revolutions per kilometer | 409 |
| Approximate rim width | 7.0" to 8.5" |
| In inches (flotation style) | 30.6x9.6R21 |
| 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 245/50R21 on a 21" wheel
These 21" sizes are within 3% of 245/50R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 305/40R21 | 30.61" | 12.01" | −0.1% | 59.9 mph | Compare |
| 225/55R21 | 30.74" | 8.86" | +0.3% | 60.2 mph | Compare |
| 275/45R21 | 30.74" | 10.83" | +0.3% | 60.2 mph | Compare |
| 355/35R21 | 30.78" | 13.98" | +0.4% | 60.3 mph | Compare |
| 345/35R21 | 30.51" | 13.58" | −0.4% | 59.7 mph | Compare |
| 265/45R21 | 30.39" | 10.43" | −0.8% | 59.5 mph | Compare |
| 315/40R21 | 30.92" | 12.40" | +0.9% | 60.5 mph | Compare |
| 295/40R21 | 30.29" | 11.61" | −1.2% | 59.3 mph | Compare |
| 255/50R21 | 31.04" | 10.04" | +1.3% | 60.8 mph | Compare |
| 235/50R21 | 30.25" | 9.25" | −1.3% | 59.2 mph | Compare |
| 335/35R21 | 30.23" | 13.19" | −1.3% | 59.2 mph | Compare |
| 285/45R21 | 31.10" | 11.22" | +1.5% | 60.9 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 265/75R15 | 15" | 30.65" | 0.0% | Compare |
| 315/55R17 | 17" | 30.64" | 0.0% | Compare |
| 275/40R22 | 22" | 30.66" | +0.1% | Compare |
| 225/60R20 | 20" | 30.63" | −0.1% | Compare |
| 295/50R19 | 19" | 30.61" | −0.1% | Compare |
| 245/45R22 | 22" | 30.68" | +0.1% | Compare |
| 315/35R22 | 22" | 30.68" | +0.1% | Compare |
| 245/55R20 | 20" | 30.61" | −0.1% | Compare |
| 265/70R16 | 16" | 30.61" | −0.1% | Compare |
| 265/80R14 | 14" | 30.69" | +0.2% | Compare |
| 215/75R18 | 18" | 30.70" | +0.2% | Compare |
| 335/25R24 | 24" | 30.59" | −0.2% | Compare |
One size up or down
- 235/50R21narrower: 30.3" × 9.3"
- 255/50R21wider: 31.0" × 10.0"
- 245/45R21lower profile: 29.7" × 9.6"
- 245/55R21taller sidewall: 31.6" × 9.6"
Compare 245/50R21 with another size
Questions
- How tall is a 245/50R21 tire?
- A 245/50R21 tire is 30.6 inches tall (778 mm), calculated from the size. It is 9.6 inches wide with 4.8 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 245/50R21 mean?
- 245/50R21 means a tire 245 mm wide, with sidewalls 50% as tall as the tire is wide (123 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 245/50R21 tire make?
- About 658 revolutions per mile, based on a circumference of 96.3 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 245/50R21 tire?
- Roughly 7.0" to 8.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 305/40R21 instead of 245/50R21?
- 305/40R21 is −0.04 inches (−0.1%) in overall diameter, so at an indicated 60 mph you would be doing 59.9 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.