27.4" tall, 8.9" wide, 6.2" sidewall
A 225/70R15 tire is 27.4 inches (696 mm) tall and 8.9 inches wide. The sidewall is 70% of the width, 6.2 inches, on a 15-inch wheel, and the tire turns about 736 times per mile.
In flotation terms that is about 27.4x8.9R15. People often call it a 27-inch tire.
The size most often compared with it is 235/60R15, which is 1.3" shorter (−4.7%). At an indicated 60 mph you would be doing 57.2 mph on it, more than the 3% change many shops use as a limit.
| 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 225/70R15 | |
|---|---|---|---|---|---|
| 215/75R15 | 27.7" | 8.5" | 6.3" | +1.1% | |
| 235/65R15 | 27.0" | 9.3" | 6.0" | −1.4% | |
| 215/70R15 | 26.9" | 8.5" | 5.9" | −2.0% | |
| 235/70R15 | 28.0" | 9.3" | 6.5" | +2.0% | |
| 245/60R15 | 26.6" | 9.6" | 5.8" | −3.0% | |
| 245/70R15 | 28.5" | 9.6" | 6.8" | +4.0% | |
| 205/70R15 | 26.3" | 8.1" | 5.6" | −4.0% | |
| 215/80R15 | 28.5" | 8.5" | 6.8" | +4.2% | |
| 235/60R15 | 26.1" | 9.3" | 5.6" | −4.7% | compare |
| 215/65R15 | 26.0" | 8.5" | 5.5" | −5.1% |
Sizes within 2% of 27.4" on 17" or 14" wheels.
| Size | Diameter | Width | Sidewall | vs 225/70R15 | |
|---|---|---|---|---|---|
| 265/50R17 | 27.4" | 10.4" | 5.2" | +0.1% | |
| 205/65R17 | 27.5" | 8.1" | 5.2" | +0.3% | |
| 245/55R17 | 27.6" | 9.6" | 5.3" | +0.8% | |
| 285/45R17 | 27.1" | 11.2" | 5.0" | −1.1% | |
| 255/65R14 | 27.1" | 10.0" | 6.5" | −1.3% | |
| 275/50R17 | 27.8" | 10.8" | 5.4" | +1.6% |
Actual speed when the speedometer is calibrated for 225/70R15.
| Speedometer shows | on 235/60R15 | on 255/60R15 | on 215/75R15 |
|---|---|---|---|
| 30 mph | 28.6 mph | 29.6 mph | 30.3 mph |
| 45 mph | 42.9 mph | 44.4 mph | 45.5 mph |
| 60 mph | 57.2 mph | 59.2 mph | 60.6 mph |
| 70 mph | 66.7 mph | 69.1 mph | 70.8 mph |
27.4 inches (696 mm). The sidewall is 6.2 inches.
8.9 inches (225 mm) section width, measured sidewall to sidewall.
About 27.4x8.9R15.
235/60R15 is −4.7% in diameter, more than the common 3% guideline, so expect a speedometer error and check clearance. It is 0.4" wider.