275/35R21 tire size in inches
A 275/35R21 tire measures
28.6" tall × 10.8" wide
3.79" sidewall on a 21" wheel. 706 revolutions per mile.
275/35R21 means a tire 275 mm wide, with sidewalls 35% as tall as the tire is wide (96 mm), radial construction (R), for a 21 inch wheel.
275/35R21 specs
| Overall diameter (height) | 28.58 inches (726 mm) |
|---|---|
| Section width | 10.83 inches (275 mm) |
| Sidewall height | 3.79 inches (96 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 89.8 inches (2,280 mm) |
| Revolutions per mile | 706 |
| Revolutions per kilometer | 439 |
| Approximate rim width | 9.0" to 10.5" |
| In inches (flotation style) | 28.6x10.8R21 |
| Aspect ratio | 35% |
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 275/35R21 on a 21" wheel
These 21" sizes are within 3% of 275/35R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 325/30R21 | 28.68" | 12.80" | +0.3% | 60.2 mph | Compare |
| 245/40R21 | 28.72" | 9.65" | +0.5% | 60.3 mph | Compare |
| 315/30R21 | 28.44" | 12.40" | −0.5% | 59.7 mph | Compare |
| 235/40R21 | 28.40" | 9.25" | −0.6% | 59.6 mph | Compare |
| 265/35R21 | 28.30" | 10.43" | −1.0% | 59.4 mph | Compare |
| 285/35R21 | 28.85" | 11.22" | +1.0% | 60.6 mph | Compare |
| 335/30R21 | 28.91" | 13.19" | +1.2% | 60.7 mph | Compare |
| 305/30R21 | 28.20" | 12.01" | −1.3% | 59.2 mph | Compare |
| 225/45R21 | 28.97" | 8.86" | +1.4% | 60.8 mph | Compare |
| 255/40R21 | 29.03" | 10.04" | +1.6% | 61.0 mph | Compare |
| 225/40R21 | 28.09" | 8.86" | −1.7% | 59.0 mph | Compare |
| 255/35R21 | 28.03" | 10.04" | −1.9% | 58.8 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 245/60R17 | 17" | 28.57" | 0.0% | Compare |
| 265/65R15 | 15" | 28.56" | −0.1% | Compare |
| 335/25R22 | 22" | 28.59" | +0.1% | Compare |
| 335/40R18 | 18" | 28.55" | −0.1% | Compare |
| 265/70R14 | 14" | 28.61" | +0.1% | Compare |
| 305/40R19 | 19" | 28.61" | +0.1% | Compare |
| 245/55R18 | 18" | 28.61" | +0.1% | Compare |
| 215/80R15 | 15" | 28.54" | −0.1% | Compare |
| 295/50R17 | 17" | 28.61" | +0.1% | Compare |
| 245/65R16 | 16" | 28.54" | −0.1% | Compare |
| 225/60R18 | 18" | 28.63" | +0.2% | Compare |
| 265/60R16 | 16" | 28.52" | −0.2% | Compare |
One size up or down
- 265/35R21narrower: 28.3" × 10.4"
- 285/35R21wider: 28.9" × 11.2"
- 275/30R21lower profile: 27.5" × 10.8"
- 275/40R21taller sidewall: 29.7" × 10.8"
Compare 275/35R21 with another size
Questions
- How tall is a 275/35R21 tire?
- A 275/35R21 tire is 28.6 inches tall (726 mm), calculated from the size. It is 10.8 inches wide with 3.8 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 275/35R21 mean?
- 275/35R21 means a tire 275 mm wide, with sidewalls 35% as tall as the tire is wide (96 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 275/35R21 tire make?
- About 706 revolutions per mile, based on a circumference of 89.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 275/35R21 tire?
- Roughly 9.0" to 10.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 325/30R21 instead of 275/35R21?
- 325/30R21 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.