185/40R17 tire size in inches
A 185/40R17 tire measures
22.8" tall × 7.3" wide
2.91" sidewall on a 17" wheel. 884 revolutions per mile.
185/40R17 means a tire 185 mm wide, with sidewalls 40% as tall as the tire is wide (74 mm), radial construction (R), for a 17 inch wheel.
185/40R17 specs
| Overall diameter (height) | 22.83 inches (580 mm) |
|---|---|
| Section width | 7.28 inches (185 mm) |
| Sidewall height | 2.91 inches (74 mm) |
| Wheel (rim) diameter | 17 inches |
| Circumference | 71.7 inches (1,821 mm) |
| Revolutions per mile | 884 |
| Revolutions per kilometer | 549 |
| Approximate rim width | 6.0" to 7.5" |
| In inches (flotation style) | 22.8x7.3R17 |
| Aspect ratio | 40% |
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 185/40R17 on a 17" wheel
These 17" sizes are within 3% of 185/40R17's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 215/35R17 | 22.93" | 8.46" | +0.4% | 60.3 mph | Compare |
| 205/35R17 | 22.65" | 8.07" | −0.8% | 59.5 mph | Compare |
| 195/40R17 | 23.14" | 7.68" | +1.4% | 60.8 mph | Compare |
| 225/35R17 | 23.20" | 8.86" | +1.6% | 61.0 mph | Compare |
| 195/35R17 | 22.37" | 7.68" | −2.0% | 58.8 mph | Compare |
| 205/40R17 | 23.46" | 8.07" | +2.8% | 61.7 mph | Compare |
| 235/35R17 | 23.48" | 9.25" | +2.8% | 61.7 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 165/60R15 | 15" | 22.80" | −0.1% | Compare |
| 205/55R14 | 14" | 22.88" | +0.2% | Compare |
| 215/40R16 | 16" | 22.77" | −0.2% | Compare |
| 155/80R13 | 13" | 22.76" | −0.3% | Compare |
| 165/75R13 | 13" | 22.74" | −0.4% | Compare |
| 195/45R16 | 16" | 22.91" | +0.4% | Compare |
| 185/60R14 | 14" | 22.74" | −0.4% | Compare |
| 145/85R13 | 13" | 22.70" | −0.5% | Compare |
| 175/65R14 | 14" | 22.96" | +0.6% | Compare |
| 205/60R13 | 13" | 22.69" | −0.6% | Compare |
| 225/45R15 | 15" | 22.97" | +0.6% | Compare |
| 195/50R15 | 15" | 22.68" | −0.7% | Compare |
One size up or down
- 195/40R17wider: 23.1" × 7.7"
- 185/35R17lower profile: 22.1" × 7.3"
- 185/45R17taller sidewall: 23.6" × 7.3"
Compare 185/40R17 with another size
Questions
- How tall is a 185/40R17 tire?
- A 185/40R17 tire is 22.8 inches tall (580 mm), calculated from the size. It is 7.3 inches wide with 2.9 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 185/40R17 mean?
- 185/40R17 means a tire 185 mm wide, with sidewalls 40% as tall as the tire is wide (74 mm), radial construction (R), for a 17 inch wheel.
- How many revolutions per mile does a 185/40R17 tire make?
- About 884 revolutions per mile, based on a circumference of 71.7 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 185/40R17 tire?
- Roughly 6.0" to 7.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 215/35R17 instead of 185/40R17?
- 215/35R17 is +0.10 inches (+0.4%) in overall diameter, so at an indicated 60 mph you would be doing 60.3 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.