285/25R21 tire size in inches
A 285/25R21 tire measures
26.6" tall × 11.2" wide
2.81" sidewall on a 21" wheel. 758 revolutions per mile.
285/25R21 means a tire 285 mm wide, with sidewalls 25% as tall as the tire is wide (71 mm), radial construction (R), for a 21 inch wheel.
285/25R21 specs
| Overall diameter (height) | 26.61 inches (676 mm) |
|---|---|
| Section width | 11.22 inches (285 mm) |
| Sidewall height | 2.81 inches (71 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 83.6 inches (2,123 mm) |
| Revolutions per mile | 758 |
| Revolutions per kilometer | 471 |
| Approximate rim width | 9.5" to 11.0" |
| In inches (flotation style) | 26.6x11.2R21 |
| 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 285/25R21 on a 21" wheel
These 21" sizes are within 3% of 285/25R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 235/30R21 | 26.55" | 9.25" | −0.2% | 59.9 mph | Compare |
| 245/30R21 | 26.79" | 9.65" | +0.7% | 60.4 mph | Compare |
| 275/25R21 | 26.41" | 10.83" | −0.7% | 59.6 mph | Compare |
| 295/25R21 | 26.81" | 11.61" | +0.7% | 60.4 mph | Compare |
| 225/30R21 | 26.31" | 8.86" | −1.1% | 59.3 mph | Compare |
| 265/25R21 | 26.22" | 10.43" | −1.5% | 59.1 mph | Compare |
| 305/25R21 | 27.00" | 12.01" | +1.5% | 60.9 mph | Compare |
| 255/30R21 | 27.02" | 10.04" | +1.6% | 60.9 mph | Compare |
| 225/35R21 | 27.20" | 8.86" | +2.2% | 61.3 mph | Compare |
| 255/25R21 | 26.02" | 10.04" | −2.2% | 58.7 mph | Compare |
| 315/25R21 | 27.20" | 12.40" | +2.2% | 61.3 mph | Compare |
| 265/30R21 | 27.26" | 10.43" | +2.4% | 61.5 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 245/55R16 | 16" | 26.61" | 0.0% | Compare |
| 305/40R17 | 17" | 26.61" | 0.0% | Compare |
| 215/45R19 | 19" | 26.62" | 0.0% | Compare |
| 235/25R22 | 22" | 26.63" | +0.1% | Compare |
| 335/25R20 | 20" | 26.59" | −0.1% | Compare |
| 225/60R16 | 16" | 26.63" | +0.1% | Compare |
| 275/35R19 | 19" | 26.58" | −0.1% | Compare |
| 245/60R15 | 15" | 26.57" | −0.1% | Compare |
| 245/50R17 | 17" | 26.65" | +0.1% | Compare |
| 185/80R15 | 15" | 26.65" | +0.2% | Compare |
| 275/40R18 | 18" | 26.66" | +0.2% | Compare |
| 215/80R13 | 13" | 26.54" | −0.3% | Compare |
One size up or down
- 275/25R21narrower: 26.4" × 10.8"
- 295/25R21wider: 26.8" × 11.6"
- 285/30R21taller sidewall: 27.7" × 11.2"
Compare 285/25R21 with another size
Questions
- How tall is a 285/25R21 tire?
- A 285/25R21 tire is 26.6 inches tall (676 mm), calculated from the size. It is 11.2 inches wide with 2.8 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 285/25R21 mean?
- 285/25R21 means a tire 285 mm wide, with sidewalls 25% as tall as the tire is wide (71 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 285/25R21 tire make?
- About 758 revolutions per mile, based on a circumference of 83.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 285/25R21 tire?
- Roughly 9.5" to 11.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 235/30R21 instead of 285/25R21?
- 235/30R21 is −0.06 inches (−0.2%) 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.