355/25R21 tire size in inches
A 355/25R21 tire measures
28.0" tall × 14.0" wide
3.49" sidewall on a 21" wheel. 721 revolutions per mile.
355/25R21 means a tire 355 mm wide, with sidewalls 25% as tall as the tire is wide (89 mm), radial construction (R), for a 21 inch wheel.
355/25R21 specs
| Overall diameter (height) | 27.99 inches (711 mm) |
|---|---|
| Section width | 13.98 inches (355 mm) |
| Sidewall height | 3.49 inches (89 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 87.9 inches (2,233 mm) |
| Revolutions per mile | 721 |
| Revolutions per kilometer | 448 |
| Approximate rim width | 11.5" to 13.0" |
| In inches (flotation style) | 28.0x14.0R21 |
| 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 355/25R21 on a 21" wheel
These 21" sizes are within 3% of 355/25R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 295/30R21 | 27.97" | 11.61" | −0.1% | 60.0 mph | Compare |
| 255/35R21 | 28.03" | 10.04" | +0.1% | 60.1 mph | Compare |
| 225/40R21 | 28.09" | 8.86" | +0.4% | 60.2 mph | Compare |
| 345/25R21 | 27.79" | 13.58" | −0.7% | 59.6 mph | Compare |
| 305/30R21 | 28.20" | 12.01" | +0.8% | 60.5 mph | Compare |
| 245/35R21 | 27.75" | 9.65" | −0.8% | 59.5 mph | Compare |
| 285/30R21 | 27.73" | 11.22" | −0.9% | 59.5 mph | Compare |
| 265/35R21 | 28.30" | 10.43" | +1.1% | 60.7 mph | Compare |
| 335/25R21 | 27.59" | 13.19" | −1.4% | 59.2 mph | Compare |
| 235/40R21 | 28.40" | 9.25" | +1.5% | 60.9 mph | Compare |
| 315/30R21 | 28.44" | 12.40" | +1.6% | 61.0 mph | Compare |
| 275/30R21 | 27.50" | 10.83" | −1.8% | 58.9 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 275/60R15 | 15" | 27.99" | 0.0% | Compare |
| 195/65R18 | 18" | 27.98" | 0.0% | Compare |
| 285/40R19 | 19" | 27.98" | 0.0% | Compare |
| 215/65R17 | 17" | 28.00" | +0.1% | Compare |
| 225/45R20 | 20" | 27.97" | −0.1% | Compare |
| 305/25R22 | 22" | 28.00" | +0.1% | Compare |
| 325/35R19 | 19" | 27.96" | −0.1% | Compare |
| 235/70R15 | 15" | 27.95" | −0.1% | Compare |
| 255/30R22 | 22" | 28.02" | +0.1% | Compare |
| 235/65R16 | 16" | 28.03" | +0.1% | Compare |
| 255/40R20 | 20" | 28.03" | +0.2% | Compare |
| 255/45R19 | 19" | 28.04" | +0.2% | Compare |
One size up or down
Compare 355/25R21 with another size
Questions
- How tall is a 355/25R21 tire?
- A 355/25R21 tire is 28.0 inches tall (711 mm), calculated from the size. It is 14.0 inches wide with 3.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 355/25R21 mean?
- 355/25R21 means a tire 355 mm wide, with sidewalls 25% as tall as the tire is wide (89 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 355/25R21 tire make?
- About 721 revolutions per mile, based on a circumference of 87.9 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 355/25R21 tire?
- Roughly 11.5" to 13.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 295/30R21 instead of 355/25R21?
- 295/30R21 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.