25.7" tall, 10.8" wide, 4.3" sidewall
A 275/40R17 tire is 25.7 inches (652 mm) tall and 10.8 inches wide. The sidewall is 40% of the width, 4.3 inches, on a 17-inch wheel, and the tire turns about 786 times per mile.
In flotation terms that is about 25.7x10.8R17. People often call it a 26-inch tire.
The size most often compared with it is 315/35R17, which is 0.0" taller (+0.1%). At an indicated 60 mph you would be doing 60.0 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 17" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 275/40R17 | |
|---|---|---|---|---|---|
| 285/40R17 | 26.0" | 11.2" | 4.5" | +1.2% | compare |
| 255/45R17 | 26.0" | 10.0" | 4.5" | +1.5% | |
| 255/40R17 | 25.0" | 10.0" | 4.0" | −2.5% | compare |
| 295/40R17 | 26.3" | 11.6" | 4.6" | +2.5% | |
| 275/35R17 | 24.6" | 10.8" | 3.8" | −4.2% | |
| 285/45R17 | 27.1" | 11.2" | 5.0" | +5.6% | |
| 265/50R17 | 27.4" | 10.4" | 5.2" | +6.9% | |
| 275/50R17 | 27.8" | 10.8" | 5.4" | +8.4% |
Sizes within 2% of 25.7" on 16" or 15" or 18" wheels.
| Size | Diameter | Width | Sidewall | vs 275/40R17 | |
|---|---|---|---|---|---|
| 245/50R16 | 25.6" | 9.6" | 4.8" | −0.1% | |
| 225/60R15 | 25.6" | 8.9" | 5.3" | −0.1% | |
| 245/55R15 | 25.6" | 9.6" | 5.3" | −0.2% | |
| 275/35R18 | 25.6" | 10.8" | 3.8" | −0.3% | |
| 275/50R15 | 25.8" | 10.8" | 5.4" | +0.6% | |
| 285/35R18 | 25.9" | 11.2" | 3.9" | +0.8% |
Actual speed when the speedometer is calibrated for 275/40R17.
| Speedometer shows | on 315/35R17 | on 255/40R17 | on 285/40R17 |
|---|---|---|---|
| 30 mph | 30.0 mph | 29.3 mph | 30.4 mph |
| 45 mph | 45.0 mph | 43.9 mph | 45.6 mph |
| 60 mph | 60.0 mph | 58.5 mph | 60.7 mph |
| 70 mph | 70.1 mph | 68.3 mph | 70.9 mph |
25.7 inches (652 mm). The sidewall is 4.3 inches.
10.8 inches (275 mm) section width, measured sidewall to sidewall.
About 25.7x10.8R17.
315/35R17 is +0.1% in diameter, within the common 3% guideline. It is 1.6" wider.