235/25R21 tire size in inches
A 235/25R21 tire measures
25.6" tall × 9.3" wide
2.31" sidewall on a 21" wheel. 787 revolutions per mile.
235/25R21 means a tire 235 mm wide, with sidewalls 25% as tall as the tire is wide (59 mm), radial construction (R), for a 21 inch wheel.
235/25R21 specs
| Overall diameter (height) | 25.63 inches (651 mm) |
|---|---|
| Section width | 9.25 inches (235 mm) |
| Sidewall height | 2.31 inches (59 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 80.5 inches (2,045 mm) |
| Revolutions per mile | 787 |
| Revolutions per kilometer | 489 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 25.6x9.3R21 |
| 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 235/25R21 on a 21" wheel
These 21" sizes are within 3% of 235/25R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 225/25R21 | 25.43" | 8.86" | −0.8% | 59.5 mph | Compare |
| 245/25R21 | 25.82" | 9.65" | +0.8% | 60.5 mph | Compare |
| 255/25R21 | 26.02" | 10.04" | +1.5% | 60.9 mph | Compare |
| 265/25R21 | 26.22" | 10.43" | +2.3% | 61.4 mph | Compare |
| 225/30R21 | 26.31" | 8.86" | +2.7% | 61.6 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 225/60R15 | 15" | 25.63" | 0.0% | Compare |
| 215/45R18 | 18" | 25.62" | 0.0% | Compare |
| 245/55R15 | 15" | 25.61" | −0.1% | Compare |
| 285/25R20 | 20" | 25.61" | −0.1% | Compare |
| 175/70R16 | 16" | 25.65" | +0.1% | Compare |
| 245/50R16 | 16" | 25.65" | +0.1% | Compare |
| 185/80R14 | 14" | 25.65" | +0.1% | Compare |
| 335/25R19 | 19" | 25.59" | −0.1% | Compare |
| 275/40R17 | 17" | 25.66" | +0.1% | Compare |
| 275/35R18 | 18" | 25.58" | −0.2% | Compare |
| 245/60R14 | 14" | 25.57" | −0.2% | Compare |
| 195/50R18 | 18" | 25.68" | +0.2% | Compare |
One size up or down
Compare 235/25R21 with another size
Questions
- How tall is a 235/25R21 tire?
- A 235/25R21 tire is 25.6 inches tall (651 mm), calculated from the size. It is 9.3 inches wide with 2.3 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 235/25R21 mean?
- 235/25R21 means a tire 235 mm wide, with sidewalls 25% as tall as the tire is wide (59 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 235/25R21 tire make?
- About 787 revolutions per mile, based on a circumference of 80.5 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 235/25R21 tire?
- Roughly 7.5" to 9.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 225/25R21 instead of 235/25R21?
- 225/25R21 is −0.20 inches (−0.8%) in overall diameter, so at an indicated 60 mph you would be doing 59.5 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.