245/25R21 tire size in inches
A 245/25R21 tire measures
25.8" tall × 9.6" wide
2.41" sidewall on a 21" wheel. 781 revolutions per mile.
245/25R21 means a tire 245 mm wide, with sidewalls 25% as tall as the tire is wide (61 mm), radial construction (R), for a 21 inch wheel.
245/25R21 specs
| Overall diameter (height) | 25.82 inches (656 mm) |
|---|---|
| Section width | 9.65 inches (245 mm) |
| Sidewall height | 2.41 inches (61 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 81.1 inches (2,061 mm) |
| Revolutions per mile | 781 |
| Revolutions per kilometer | 485 |
| Approximate rim width | 8.0" to 9.5" |
| In inches (flotation style) | 25.8x9.6R21 |
| Aspect ratio | 25% |
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 245/25R21 on a 21" wheel
These 21" sizes are within 3% of 245/25R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 255/25R21 | 26.02" | 10.04" | +0.8% | 60.5 mph | Compare |
| 235/25R21 | 25.63" | 9.25" | −0.8% | 59.5 mph | Compare |
| 225/25R21 | 25.43" | 8.86" | −1.5% | 59.1 mph | Compare |
| 265/25R21 | 26.22" | 10.43" | +1.5% | 60.9 mph | Compare |
| 225/30R21 | 26.31" | 8.86" | +1.9% | 61.1 mph | Compare |
| 275/25R21 | 26.41" | 10.83" | +2.3% | 61.4 mph | Compare |
| 235/30R21 | 26.55" | 9.25" | +2.8% | 61.7 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 275/50R15 | 15" | 25.83" | 0.0% | Compare |
| 295/25R20 | 20" | 25.81" | −0.1% | Compare |
| 215/70R14 | 14" | 25.85" | +0.1% | Compare |
| 285/35R18 | 18" | 25.85" | +0.1% | Compare |
| 345/25R19 | 19" | 25.79" | −0.1% | Compare |
| 225/50R17 | 17" | 25.86" | +0.1% | Compare |
| 245/30R20 | 20" | 25.79" | −0.1% | Compare |
| 215/40R19 | 19" | 25.77" | −0.2% | Compare |
| 205/55R17 | 17" | 25.88" | +0.2% | Compare |
| 245/35R19 | 19" | 25.75" | −0.3% | Compare |
| 195/70R15 | 15" | 25.75" | −0.3% | Compare |
| 225/55R16 | 16" | 25.74" | −0.3% | Compare |
One size up or down
Compare 245/25R21 with another size
Questions
- How tall is a 245/25R21 tire?
- A 245/25R21 tire is 25.8 inches tall (656 mm), calculated from the size. It is 9.6 inches wide with 2.4 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 245/25R21 mean?
- 245/25R21 means a tire 245 mm wide, with sidewalls 25% as tall as the tire is wide (61 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 245/25R21 tire make?
- About 781 revolutions per mile, based on a circumference of 81.1 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 245/25R21 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 255/25R21 instead of 245/25R21?
- 255/25R21 is +0.20 inches (+0.8%) in overall diameter, so at an indicated 60 mph you would be doing 60.5 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.