225/50R21 tire size in inches
A 225/50R21 tire measures
29.9" tall × 8.9" wide
4.43" sidewall on a 21" wheel. 675 revolutions per mile.
225/50R21 means a tire 225 mm wide, with sidewalls 50% as tall as the tire is wide (113 mm), radial construction (R), for a 21 inch wheel.
225/50R21 specs
| Overall diameter (height) | 29.86 inches (758 mm) |
|---|---|
| Section width | 8.86 inches (225 mm) |
| Sidewall height | 4.43 inches (113 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 93.8 inches (2,383 mm) |
| Revolutions per mile | 675 |
| Revolutions per kilometer | 420 |
| Approximate rim width | 6.5" to 8.0" |
| In inches (flotation style) | 29.9x8.9R21 |
| Aspect ratio | 50% |
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 225/50R21 on a 21" wheel
These 21" sizes are within 3% of 225/50R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 325/35R21 | 29.96" | 12.80" | +0.3% | 60.2 mph | Compare |
| 285/40R21 | 29.98" | 11.22" | +0.4% | 60.2 mph | Compare |
| 245/45R21 | 29.68" | 9.65" | −0.6% | 59.6 mph | Compare |
| 255/45R21 | 30.04" | 10.04" | +0.6% | 60.4 mph | Compare |
| 315/35R21 | 29.68" | 12.40" | −0.6% | 59.6 mph | Compare |
| 275/40R21 | 29.66" | 10.83" | −0.7% | 59.6 mph | Compare |
| 335/35R21 | 30.23" | 13.19" | +1.3% | 60.8 mph | Compare |
| 235/50R21 | 30.25" | 9.25" | +1.3% | 60.8 mph | Compare |
| 295/40R21 | 30.29" | 11.61" | +1.5% | 60.9 mph | Compare |
| 305/35R21 | 29.41" | 12.01" | −1.5% | 59.1 mph | Compare |
| 355/30R21 | 29.39" | 13.98" | −1.6% | 59.1 mph | Compare |
| 265/40R21 | 29.35" | 10.43" | −1.7% | 59.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 285/35R22 | 22" | 29.85" | 0.0% | Compare |
| 215/70R18 | 18" | 29.85" | 0.0% | Compare |
| 345/40R19 | 19" | 29.87" | 0.0% | Compare |
| 335/45R18 | 18" | 29.87" | 0.0% | Compare |
| 235/75R16 | 16" | 29.88" | +0.1% | Compare |
| 275/50R19 | 19" | 29.83" | −0.1% | Compare |
| 275/55R18 | 18" | 29.91" | +0.2% | Compare |
| 295/25R24 | 24" | 29.81" | −0.2% | Compare |
| 305/45R19 | 19" | 29.81" | −0.2% | Compare |
| 235/80R15 | 15" | 29.80" | −0.2% | Compare |
| 335/30R22 | 22" | 29.91" | +0.2% | Compare |
| 315/40R20 | 20" | 29.92" | +0.2% | Compare |
One size up or down
- 235/50R21wider: 30.3" × 9.3"
- 225/45R21lower profile: 29.0" × 8.9"
- 225/55R21taller sidewall: 30.7" × 8.9"
Compare 225/50R21 with another size
Questions
- How tall is a 225/50R21 tire?
- A 225/50R21 tire is 29.9 inches tall (758 mm), calculated from the size. It is 8.9 inches wide with 4.4 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 225/50R21 mean?
- 225/50R21 means a tire 225 mm wide, with sidewalls 50% as tall as the tire is wide (113 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 225/50R21 tire make?
- About 675 revolutions per mile, based on a circumference of 93.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 225/50R21 tire?
- Roughly 6.5" to 8.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 325/35R21 instead of 225/50R21?
- 325/35R21 is +0.10 inches (+0.3%) in overall diameter, so at an indicated 60 mph you would be doing 60.2 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.