Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-18 | 255/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673.2) | 32.06 (814.2) | 5.55 (141) 20.9% |
| Width inches (mm) | 5.31 (135) | 10.04 (255) | 4.72 (120) 88.9% |
| Circum. inches (mm) | 83.26 (2114.92) | 100.7 (2557.88) | 17.44 (442.96) 20.9% |
| Sidewall Height inches (mm) | 4.25 (108) | 7.03 (178.5) | 2.78 (70.5) 65.3% |
| Revolutions per mile (km) | 760.95 (472.83) | 629.17 (390.95) | -131.78 (-81.88) -17.3% |
255/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.19 mph (38.93 km/h) |
| 25 mph (40.23 km/h) | 30.24 mph (48.66 km/h) |
| 30 mph (48.28 km/h) | 36.28 mph (58.39 km/h) |
| 35 mph (56.33 km/h) | 42.33 mph (68.12 km/h) |
| 40 mph (64.37 km/h) | 48.38 mph (77.86 km/h) |
| 45 mph (72.42 km/h) | 54.43 mph (87.59 km/h) |
| 50 mph (80.47 km/h) | 60.47 mph (97.32 km/h) |
| 55 mph (88.51 km/h) | 66.52 mph (107.05 km/h) |
| 60 mph (96.56 km/h) | 72.57 mph (116.79 km/h) |
| 65 mph (104.61 km/h) | 78.61 mph (126.52 km/h) |
| 70 mph (112.65 km/h) | 84.66 mph (136.25 km/h) |
| 75 mph (120.7 km/h) | 90.71 mph (145.98 km/h) |
| 80 mph (128.75 km/h) | 96.76 mph (155.71 km/h) |
| 85 mph (136.79 km/h) | 102.8 mph (165.45 km/h) |
| 90 mph (144.84 km/h) | 108.85 mph (175.18 km/h) |
| 95 mph (152.89 km/h) | 114.9 mph (184.91 km/h) |
| 100 mph (160.93 km/h) | 120.94 mph (194.64 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1601 | 1860 | 2003 | 2092 | 2187 | 2255 | 2330 | 2419 | 2541 | 2664 | 2800 | 2909 | 3107 | 3325 | 3495 | 3604 | 3666 | 3890 | 4204 | 4885 |
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