Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-21 | 255/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.66 (753.4) | 30.05 (763.2) | 0.39 (9.8) 1.3% |
| Width inches (mm) | 10.83 (275) | 10.04 (255) | -0.79 (-20) -7.3% |
| Circum. inches (mm) | 93.18 (2366.88) | 94.4 (2397.66) | 1.21 (30.79) 1.3% |
| Sidewall Height inches (mm) | 4.33 (110) | 6.02 (153) | 1.69 (43) 39.1% |
| Revolutions per mile (km) | 679.94 (422.5) | 671.21 (417.07) | -8.73 (-5.43) -1.3% |
255/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.26 mph (32.61 km/h) |
| 25 mph (40.23 km/h) | 25.33 mph (40.76 km/h) |
| 30 mph (48.28 km/h) | 30.39 mph (48.91 km/h) |
| 35 mph (56.33 km/h) | 35.46 mph (57.06 km/h) |
| 40 mph (64.37 km/h) | 40.52 mph (65.21 km/h) |
| 45 mph (72.42 km/h) | 45.59 mph (73.36 km/h) |
| 50 mph (80.47 km/h) | 50.65 mph (81.51 km/h) |
| 55 mph (88.51 km/h) | 55.72 mph (89.67 km/h) |
| 60 mph (96.56 km/h) | 60.78 mph (97.82 km/h) |
| 65 mph (104.61 km/h) | 65.85 mph (105.97 km/h) |
| 70 mph (112.65 km/h) | 70.91 mph (114.12 km/h) |
| 75 mph (120.7 km/h) | 75.98 mph (122.27 km/h) |
| 80 mph (128.75 km/h) | 81.04 mph (130.42 km/h) |
| 85 mph (136.79 km/h) | 86.11 mph (138.57 km/h) |
| 90 mph (144.84 km/h) | 91.17 mph (146.73 km/h) |
| 95 mph (152.89 km/h) | 96.24 mph (154.88 km/h) |
| 100 mph (160.93 km/h) | 101.3 mph (163.03 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1708 | 1984 | 2137 | 2231 | 2333 | 2406 | 2486 | 2580 | 2711 | 2842 | 2987 | 3104 | 3314 | 3547 | 3729 | 3845 | 3910 | 4150 | 4485 | 5212 |
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