27.7" tall, 8.5" wide, 6.3" sidewall
A 215/75R15 tire is 27.7 inches (704 mm) tall and 8.5 inches wide. The sidewall is 75% of the width, 6.3 inches, on a 15-inch wheel, and the tire turns about 728 times per mile.
In flotation terms that is about 27.7x8.5R15. People often call it a 28-inch tire.
The size most often compared with it is 195/80R15, which is 0.4" shorter (−1.5%). At an indicated 60 mph you would be doing 59.1 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 15" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 215/75R15 | |
|---|---|---|---|---|---|
| 235/70R15 | 28.0" | 9.3" | 6.5" | +0.9% | |
| 225/70R15 | 27.4" | 8.9" | 6.2" | −1.1% | |
| 195/80R15 | 27.3" | 7.7" | 6.1" | −1.5% | compare |
| 235/65R15 | 27.0" | 9.3" | 6.0" | −2.4% | |
| 215/70R15 | 26.9" | 8.5" | 5.9" | −3.1% | |
| 215/80R15 | 28.5" | 8.5" | 6.8" | +3.1% | |
| 235/75R15 | 28.9" | 9.3" | 6.9" | +4.3% | |
| 205/70R15 | 26.3" | 8.1" | 5.6" | −5.0% | |
| 215/65R15 | 26.0" | 8.5" | 5.5" | −6.1% | |
| 235/85R15 | 30.7" | 9.3" | 7.9" | +10.9% |
Sizes within 2% of 27.7" on 17" wheels.
| Size | Diameter | Width | Sidewall | vs 215/75R15 | |
|---|---|---|---|---|---|
| 245/55R17 | 27.6" | 9.6" | 5.3" | −0.3% | |
| 275/50R17 | 27.8" | 10.8" | 5.4" | +0.5% | |
| 205/65R17 | 27.5" | 8.1" | 5.2" | −0.7% | |
| 265/50R17 | 27.4" | 10.4" | 5.2" | −1.0% |
Actual speed when the speedometer is calibrated for 215/75R15.
| Speedometer shows | on 195/80R15 | on 235/70R15 | on 225/70R15 |
|---|---|---|---|
| 30 mph | 29.6 mph | 30.3 mph | 29.7 mph |
| 45 mph | 44.3 mph | 45.4 mph | 44.5 mph |
| 60 mph | 59.1 mph | 60.6 mph | 59.4 mph |
| 70 mph | 69.0 mph | 70.6 mph | 69.3 mph |
27.7 inches (704 mm). The sidewall is 6.3 inches.
8.5 inches (215 mm) section width, measured sidewall to sidewall.
About 27.7x8.5R15.
195/80R15 is −1.5% in diameter, within the common 3% guideline. It is 0.8" narrower.