25.8" tall, 10.8" wide, 5.4" sidewall
A 275/50R15 tire is 25.8 inches (656 mm) tall and 10.8 inches wide. The sidewall is 50% of the width, 5.4 inches, on a 15-inch wheel, and the tire turns about 781 times per mile.
In flotation terms that is about 25.8x10.8R15. People often call it a 26-inch tire.
The size most often compared with it is 275/60R15, which is 2.2" taller (+8.4%). At an indicated 60 mph you would be doing 65.0 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 275/50R15 | |
|---|---|---|---|---|---|
| 255/55R15 | 26.0" | 10.0" | 5.5" | +0.8% | |
| 265/50R15 | 25.4" | 10.4" | 5.2" | −1.5% | |
| 295/50R15 | 26.6" | 11.6" | 5.8" | +3.0% | |
| 275/55R15 | 26.9" | 10.8" | 6.0" | +4.2% | |
| 255/60R15 | 27.0" | 10.0" | 6.0" | +4.7% | compare |
| 295/55R15 | 27.8" | 11.6" | 6.4" | +7.5% | |
| 275/60R15 | 28.0" | 10.8" | 6.5" | +8.4% | compare |
| 285/60R15 | 28.5" | 11.2" | 6.7" | +10.2% | |
| 295/60R15 | 28.9" | 11.6" | 7.0" | +12.0% |
Sizes within 2% of 25.8" on 17" or 16" or 14" wheels.
| Size | Diameter | Width | Sidewall | vs 275/50R15 | |
|---|---|---|---|---|---|
| 315/35R17 | 25.7" | 12.4" | 4.3" | −0.6% | |
| 285/40R17 | 26.0" | 11.2" | 4.5" | +0.6% | |
| 275/40R17 | 25.7" | 10.8" | 4.3" | −0.6% | |
| 245/50R16 | 25.6" | 9.6" | 4.8" | −0.7% | |
| 255/45R17 | 26.0" | 10.0" | 4.5" | +0.8% | |
| 195/75R14 | 25.5" | 7.7" | 5.8" | −1.2% |
Actual speed when the speedometer is calibrated for 275/50R15.
| Speedometer shows | on 275/60R15 | on 255/60R15 | on 255/55R15 |
|---|---|---|---|
| 30 mph | 32.5 mph | 31.4 mph | 30.3 mph |
| 45 mph | 48.8 mph | 47.1 mph | 45.4 mph |
| 60 mph | 65.0 mph | 62.8 mph | 60.5 mph |
| 70 mph | 75.9 mph | 73.3 mph | 70.6 mph |
25.8 inches (656 mm). The sidewall is 5.4 inches.
10.8 inches (275 mm) section width, measured sidewall to sidewall.
About 25.8x10.8R15.
275/60R15 is +8.4% in diameter, more than the common 3% guideline, so expect a speedometer error and check clearance. It is 0.0" wider.