225/30R21 tire size in inches
A 225/30R21 tire measures
26.3" tall × 8.9" wide
2.66" sidewall on a 21" wheel. 766 revolutions per mile.
225/30R21 means a tire 225 mm wide, with sidewalls 30% as tall as the tire is wide (68 mm), radial construction (R), for a 21 inch wheel.
225/30R21 specs
| Overall diameter (height) | 26.31 inches (668 mm) |
|---|---|
| Section width | 8.86 inches (225 mm) |
| Sidewall height | 2.66 inches (68 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 82.7 inches (2,100 mm) |
| Revolutions per mile | 766 |
| Revolutions per kilometer | 476 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 26.3x8.9R21 |
| Aspect ratio | 30% |
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 225/30R21 on a 21" wheel
These 21" sizes are within 3% of 225/30R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 265/25R21 | 26.22" | 10.43" | −0.4% | 59.8 mph | Compare |
| 275/25R21 | 26.41" | 10.83" | +0.4% | 60.2 mph | Compare |
| 235/30R21 | 26.55" | 9.25" | +0.9% | 60.5 mph | Compare |
| 255/25R21 | 26.02" | 10.04" | −1.1% | 59.3 mph | Compare |
| 285/25R21 | 26.61" | 11.22" | +1.1% | 60.7 mph | Compare |
| 245/30R21 | 26.79" | 9.65" | +1.8% | 61.1 mph | Compare |
| 245/25R21 | 25.82" | 9.65" | −1.9% | 58.9 mph | Compare |
| 295/25R21 | 26.81" | 11.61" | +1.9% | 61.1 mph | Compare |
| 235/25R21 | 25.63" | 9.25" | −2.6% | 58.4 mph | Compare |
| 305/25R21 | 27.00" | 12.01" | +2.6% | 61.6 mph | Compare |
| 255/30R21 | 27.02" | 10.04" | +2.7% | 61.6 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 215/55R17 | 17" | 26.31" | 0.0% | Compare |
| 265/35R19 | 19" | 26.30" | 0.0% | Compare |
| 235/45R18 | 18" | 26.33" | 0.0% | Compare |
| 205/70R15 | 15" | 26.30" | −0.1% | Compare |
| 175/75R16 | 16" | 26.33" | +0.1% | Compare |
| 295/40R17 | 17" | 26.29" | −0.1% | Compare |
| 225/75R13 | 13" | 26.29" | −0.1% | Compare |
| 195/80R14 | 14" | 26.28" | −0.1% | Compare |
| 265/40R18 | 18" | 26.35" | +0.1% | Compare |
| 205/45R19 | 19" | 26.26" | −0.2% | Compare |
| 265/30R20 | 20" | 26.26" | −0.2% | Compare |
| 235/50R17 | 17" | 26.25" | −0.2% | Compare |
One size up or down
- 235/30R21wider: 26.6" × 9.3"
- 225/25R21lower profile: 25.4" × 8.9"
- 225/35R21taller sidewall: 27.2" × 8.9"
Compare 225/30R21 with another size
Questions
- How tall is a 225/30R21 tire?
- A 225/30R21 tire is 26.3 inches tall (668 mm), calculated from the size. It is 8.9 inches wide with 2.7 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 225/30R21 mean?
- 225/30R21 means a tire 225 mm wide, with sidewalls 30% as tall as the tire is wide (68 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 225/30R21 tire make?
- About 766 revolutions per mile, based on a circumference of 82.7 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 225/30R21 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 265/25R21 instead of 225/30R21?
- 265/25R21 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.