345/50R21 tire size in inches
A 345/50R21 tire measures
34.6" tall × 13.6" wide
6.79" sidewall on a 21" wheel. 583 revolutions per mile.
345/50R21 means a tire 345 mm wide, with sidewalls 50% as tall as the tire is wide (173 mm), radial construction (R), for a 21 inch wheel.
345/50R21 specs
| Overall diameter (height) | 34.58 inches (878 mm) |
|---|---|
| Section width | 13.58 inches (345 mm) |
| Sidewall height | 6.79 inches (173 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 108.6 inches (2,760 mm) |
| Revolutions per mile | 583 |
| Revolutions per kilometer | 362 |
| Approximate rim width | 10.0" to 11.5" |
| In inches (flotation style) | 34.6x13.6R21 |
| 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 345/50R21 on a 21" wheel
These 21" sizes are within 3% of 345/50R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 315/55R21 | 34.64" | 12.40" | +0.2% | 60.1 mph | Compare |
| 305/55R21 | 34.21" | 12.01" | −1.1% | 59.4 mph | Compare |
| 355/50R21 | 34.98" | 13.98" | +1.1% | 60.7 mph | Compare |
| 335/50R21 | 34.19" | 13.19" | −1.1% | 59.3 mph | Compare |
| 325/55R21 | 35.07" | 12.80" | +1.4% | 60.9 mph | Compare |
| 325/50R21 | 33.80" | 12.80" | −2.3% | 58.6 mph | Compare |
| 295/55R21 | 33.78" | 11.61" | −2.3% | 58.6 mph | Compare |
| 335/55R21 | 35.51" | 13.19" | +2.7% | 61.6 mph | Compare |
| 355/45R21 | 33.58" | 13.98" | −2.9% | 58.3 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 295/80R16 | 16" | 34.58" | 0.0% | Compare |
| 285/65R20 | 20" | 34.59" | 0.0% | Compare |
| 355/45R22 | 22" | 34.58" | 0.0% | Compare |
| 305/65R19 | 19" | 34.61" | +0.1% | Compare |
| 335/40R24 | 24" | 34.55" | −0.1% | Compare |
| 325/65R18 | 18" | 34.63" | +0.1% | Compare |
| 335/55R20 | 20" | 34.51" | −0.2% | Compare |
| 295/75R17 | 17" | 34.42" | −0.5% | Compare |
| 305/60R20 | 20" | 34.41" | −0.5% | Compare |
| 275/85R16 | 16" | 34.41" | −0.5% | Compare |
| 315/50R22 | 22" | 34.40" | −0.5% | Compare |
| 295/55R22 | 22" | 34.78" | +0.6% | Compare |
One size up or down
- 335/50R21narrower: 34.2" × 13.2"
- 355/50R21wider: 35.0" × 14.0"
- 345/45R21lower profile: 33.2" × 13.6"
- 345/55R21taller sidewall: 35.9" × 13.6"
Compare 345/50R21 with another size
Questions
- How tall is a 345/50R21 tire?
- A 345/50R21 tire is 34.6 inches tall (878 mm), calculated from the size. It is 13.6 inches wide with 6.8 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 345/50R21 mean?
- 345/50R21 means a tire 345 mm wide, with sidewalls 50% as tall as the tire is wide (173 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 345/50R21 tire make?
- About 583 revolutions per mile, based on a circumference of 108.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 345/50R21 tire?
- Roughly 10.0" to 11.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 315/55R21 instead of 345/50R21?
- 315/55R21 is +0.06 inches (+0.2%) in overall diameter, so at an indicated 60 mph you would be doing 60.1 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.