275/25R21 tire size in inches
A 275/25R21 tire measures
26.4" tall × 10.8" wide
2.71" sidewall on a 21" wheel. 764 revolutions per mile.
275/25R21 means a tire 275 mm wide, with sidewalls 25% as tall as the tire is wide (69 mm), radial construction (R), for a 21 inch wheel.
275/25R21 specs
| Overall diameter (height) | 26.41 inches (671 mm) |
|---|---|
| Section width | 10.83 inches (275 mm) |
| Sidewall height | 2.71 inches (69 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 83.0 inches (2,108 mm) |
| Revolutions per mile | 764 |
| Revolutions per kilometer | 474 |
| Approximate rim width | 9.0" to 10.5" |
| In inches (flotation style) | 26.4x10.8R21 |
| 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 275/25R21 on a 21" wheel
These 21" sizes are within 3% of 275/25R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 225/30R21 | 26.31" | 8.86" | −0.4% | 59.8 mph | Compare |
| 235/30R21 | 26.55" | 9.25" | +0.5% | 60.3 mph | Compare |
| 265/25R21 | 26.22" | 10.43" | −0.7% | 59.6 mph | Compare |
| 285/25R21 | 26.61" | 11.22" | +0.7% | 60.4 mph | Compare |
| 245/30R21 | 26.79" | 9.65" | +1.4% | 60.8 mph | Compare |
| 255/25R21 | 26.02" | 10.04" | −1.5% | 59.1 mph | Compare |
| 295/25R21 | 26.81" | 11.61" | +1.5% | 60.9 mph | Compare |
| 245/25R21 | 25.82" | 9.65" | −2.2% | 58.7 mph | Compare |
| 305/25R21 | 27.00" | 12.01" | +2.2% | 61.3 mph | Compare |
| 255/30R21 | 27.02" | 10.04" | +2.3% | 61.4 mph | Compare |
| 235/25R21 | 25.63" | 9.25" | −3.0% | 58.2 mph | Compare |
| 225/35R21 | 27.20" | 8.86" | +3.0% | 61.8 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 305/35R18 | 18" | 26.41" | 0.0% | Compare |
| 225/70R14 | 14" | 26.40" | 0.0% | Compare |
| 235/40R19 | 19" | 26.40" | 0.0% | Compare |
| 325/25R20 | 20" | 26.40" | −0.1% | Compare |
| 265/50R16 | 16" | 26.43" | +0.1% | Compare |
| 265/45R17 | 17" | 26.39" | −0.1% | Compare |
| 315/30R19 | 19" | 26.44" | +0.1% | Compare |
| 185/85R14 | 14" | 26.38" | −0.1% | Compare |
| 195/55R18 | 18" | 26.44" | +0.1% | Compare |
| 295/45R16 | 16" | 26.45" | +0.1% | Compare |
| 215/50R18 | 18" | 26.46" | +0.2% | Compare |
| 185/65R17 | 17" | 26.47" | +0.2% | Compare |
One size up or down
- 265/25R21narrower: 26.2" × 10.4"
- 285/25R21wider: 26.6" × 11.2"
- 275/30R21taller sidewall: 27.5" × 10.8"
Compare 275/25R21 with another size
Questions
- How tall is a 275/25R21 tire?
- A 275/25R21 tire is 26.4 inches tall (671 mm), calculated from the size. It is 10.8 inches wide with 2.7 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 275/25R21 mean?
- 275/25R21 means a tire 275 mm wide, with sidewalls 25% as tall as the tire is wide (69 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 275/25R21 tire make?
- About 764 revolutions per mile, based on a circumference of 83.0 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 275/25R21 tire?
- Roughly 9.0" to 10.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 225/30R21 instead of 275/25R21?
- 225/30R21 is −0.10 inches (−0.4%) in overall diameter, so at an indicated 60 mph you would be doing 59.8 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.