275/50R21 tire size in inches
A 275/50R21 tire measures
31.8" tall × 10.8" wide
5.41" sidewall on a 21" wheel. 634 revolutions per mile.
275/50R21 means a tire 275 mm wide, with sidewalls 50% as tall as the tire is wide (138 mm), radial construction (R), for a 21 inch wheel.
275/50R21 specs
| Overall diameter (height) | 31.83 inches (808 mm) |
|---|---|
| Section width | 10.83 inches (275 mm) |
| Sidewall height | 5.41 inches (138 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 100.0 inches (2,540 mm) |
| Revolutions per mile | 634 |
| Revolutions per kilometer | 394 |
| Approximate rim width | 8.0" to 9.5" |
| In inches (flotation style) | 31.8x10.8R21 |
| 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 275/50R21 on a 21" wheel
These 21" sizes are within 3% of 275/50R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 305/45R21 | 31.81" | 12.01" | −0.1% | 60.0 mph | Compare |
| 345/40R21 | 31.87" | 13.58" | +0.1% | 60.1 mph | Compare |
| 245/55R21 | 31.61" | 9.65" | −0.7% | 59.6 mph | Compare |
| 255/55R21 | 32.04" | 10.04" | +0.7% | 60.4 mph | Compare |
| 335/40R21 | 31.55" | 13.19" | −0.9% | 59.5 mph | Compare |
| 315/45R21 | 32.16" | 12.40" | +1.1% | 60.6 mph | Compare |
| 355/40R21 | 32.18" | 13.98" | +1.1% | 60.7 mph | Compare |
| 295/45R21 | 31.45" | 11.61" | −1.2% | 59.3 mph | Compare |
| 265/50R21 | 31.43" | 10.43" | −1.2% | 59.3 mph | Compare |
| 285/50R21 | 32.22" | 11.22" | +1.2% | 60.7 mph | Compare |
| 325/40R21 | 31.24" | 12.80" | −1.9% | 58.9 mph | Compare |
| 235/55R21 | 31.18" | 9.25" | −2.0% | 58.8 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 285/75R15 | 15" | 31.83" | 0.0% | Compare |
| 285/35R24 | 24" | 31.85" | +0.1% | Compare |
| 325/50R19 | 19" | 31.80" | −0.1% | Compare |
| 335/45R20 | 20" | 31.87" | +0.1% | Compare |
| 355/35R22 | 22" | 31.78" | −0.1% | Compare |
| 235/75R18 | 18" | 31.88" | +0.2% | Compare |
| 295/55R19 | 19" | 31.78" | −0.2% | Compare |
| 315/60R17 | 17" | 31.88" | +0.2% | Compare |
| 275/55R20 | 20" | 31.91" | +0.3% | Compare |
| 275/45R22 | 22" | 31.74" | −0.3% | Compare |
| 335/30R24 | 24" | 31.91" | +0.3% | Compare |
| 265/85R14 | 14" | 31.74" | −0.3% | Compare |
One size up or down
- 265/50R21narrower: 31.4" × 10.4"
- 285/50R21wider: 32.2" × 11.2"
- 275/45R21lower profile: 30.7" × 10.8"
- 275/55R21taller sidewall: 32.9" × 10.8"
Compare 275/50R21 with another size
Questions
- How tall is a 275/50R21 tire?
- A 275/50R21 tire is 31.8 inches tall (808 mm), calculated from the size. It is 10.8 inches wide with 5.4 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 275/50R21 mean?
- 275/50R21 means a tire 275 mm wide, with sidewalls 50% as tall as the tire is wide (138 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 275/50R21 tire make?
- About 634 revolutions per mile, based on a circumference of 100.0 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 275/50R21 tire?
- Roughly 8.0" to 9.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 305/45R21 instead of 275/50R21?
- 305/45R21 is −0.02 inches (−0.1%) in overall diameter, so at an indicated 60 mph you would be doing 60.0 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.