23.4" tall, 7.7" wide, 4.2" sidewall
A 195/55R15 tire is 23.4 inches (596 mm) tall and 7.7 inches wide. The sidewall is 55% of the width, 4.2 inches, on a 15-inch wheel, and the tire turns about 860 times per mile.
In flotation terms that is about 23.4x7.7R15. People often call it a 23-inch tire.
The size most often compared with it is 175/65R15, which is 0.5" taller (+2.2%). At an indicated 60 mph you would be doing 61.3 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 195/55R15 | |
|---|---|---|---|---|---|
| 175/65R15 | 24.0" | 6.9" | 4.5" | +2.2% | |
| 215/60R15 | 25.2" | 8.5" | 5.1" | +7.3% | |
| 215/65R15 | 26.0" | 8.5" | 5.5" | +10.9% |
Sizes within 2% of 23.4" on 14" wheels.
| Size | Diameter | Width | Sidewall | vs 195/55R15 | |
|---|---|---|---|---|---|
| 195/60R14 | 23.2" | 7.7" | 4.6" | −1.0% |
Actual speed when the speedometer is calibrated for 195/55R15.
| Speedometer shows | on 175/65R15 | on 215/60R15 | on 215/65R15 |
|---|---|---|---|
| 30 mph | 30.7 mph | 32.2 mph | 33.3 mph |
| 45 mph | 46.0 mph | 48.3 mph | 49.9 mph |
| 60 mph | 61.3 mph | 64.4 mph | 66.5 mph |
| 70 mph | 71.5 mph | 75.1 mph | 77.6 mph |
23.4 inches (596 mm). The sidewall is 4.2 inches.
7.7 inches (195 mm) section width, measured sidewall to sidewall.
About 23.4x7.7R15.
175/65R15 is +2.2% in diameter, within the common 3% guideline. It is 0.8" narrower.