285/35R21 tire size in inches
A 285/35R21 tire measures
28.9" tall × 11.2" wide
3.93" sidewall on a 21" wheel. 699 revolutions per mile.
285/35R21 means a tire 285 mm wide, with sidewalls 35% as tall as the tire is wide (100 mm), radial construction (R), for a 21 inch wheel.
285/35R21 specs
| Overall diameter (height) | 28.85 inches (733 mm) |
|---|---|
| Section width | 11.22 inches (285 mm) |
| Sidewall height | 3.93 inches (100 mm) |
| Wheel (rim) diameter | 21 inches |
| Circumference | 90.6 inches (2,302 mm) |
| Revolutions per mile | 699 |
| Revolutions per kilometer | 434 |
| Approximate rim width | 9.5" to 11.0" |
| In inches (flotation style) | 28.9x11.2R21 |
| 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 285/35R21 on a 21" wheel
These 21" sizes are within 3% of 285/35R21's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 335/30R21 | 28.91" | 13.19" | +0.2% | 60.1 mph | Compare |
| 225/45R21 | 28.97" | 8.86" | +0.4% | 60.2 mph | Compare |
| 245/40R21 | 28.72" | 9.65" | −0.5% | 59.7 mph | Compare |
| 255/40R21 | 29.03" | 10.04" | +0.6% | 60.4 mph | Compare |
| 325/30R21 | 28.68" | 12.80" | −0.6% | 59.6 mph | Compare |
| 295/35R21 | 29.13" | 11.61" | +1.0% | 60.6 mph | Compare |
| 275/35R21 | 28.58" | 10.83" | −1.0% | 59.4 mph | Compare |
| 345/30R21 | 29.15" | 13.58" | +1.0% | 60.6 mph | Compare |
| 315/30R21 | 28.44" | 12.40" | −1.4% | 59.1 mph | Compare |
| 235/40R21 | 28.40" | 9.25" | −1.6% | 59.1 mph | Compare |
| 235/45R21 | 29.33" | 9.25" | +1.6% | 61.0 mph | Compare |
| 265/40R21 | 29.35" | 10.43" | +1.7% | 61.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 225/50R20 | 20" | 28.86" | 0.0% | Compare |
| 215/70R17 | 17" | 28.85" | 0.0% | Compare |
| 235/75R15 | 15" | 28.88" | +0.1% | Compare |
| 275/50R18 | 18" | 28.83" | −0.1% | Compare |
| 305/45R18 | 18" | 28.81" | −0.2% | Compare |
| 235/80R14 | 14" | 28.80" | −0.2% | Compare |
| 275/55R17 | 17" | 28.91" | +0.2% | Compare |
| 205/80R16 | 16" | 28.91" | +0.2% | Compare |
| 345/25R22 | 22" | 28.79" | −0.2% | Compare |
| 315/40R19 | 19" | 28.92" | +0.2% | Compare |
| 355/35R19 | 19" | 28.78" | −0.2% | Compare |
| 295/55R16 | 16" | 28.78" | −0.3% | Compare |
One size up or down
- 275/35R21narrower: 28.6" × 10.8"
- 295/35R21wider: 29.1" × 11.6"
- 285/30R21lower profile: 27.7" × 11.2"
- 285/40R21taller sidewall: 30.0" × 11.2"
Compare 285/35R21 with another size
Questions
- How tall is a 285/35R21 tire?
- A 285/35R21 tire is 28.9 inches tall (733 mm), calculated from the size. It is 11.2 inches wide with 3.9 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 285/35R21 mean?
- 285/35R21 means a tire 285 mm wide, with sidewalls 35% as tall as the tire is wide (100 mm), radial construction (R), for a 21 inch wheel.
- How many revolutions per mile does a 285/35R21 tire make?
- About 699 revolutions per mile, based on a circumference of 90.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 285/35R21 tire?
- Roughly 9.5" to 11.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 335/30R21 instead of 285/35R21?
- 335/30R21 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.