Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-17 | 145/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.13 (663.8) | 25.99 (660.2) | -0.14 (-3.6) -0.5% |
| Width inches (mm) | 5.71 (145) | 5.71 (145) | 0 (0) 0% |
| Circum. inches (mm) | 82.1 (2085.39) | 81.66 (2074.08) | -0.45 (-11.31) -0.5% |
| Sidewall Height inches (mm) | 4.57 (116) | 4 (101.5) | -0.57 (-14.5) -12.5% |
| Revolutions per mile (km) | 771.72 (479.53) | 775.93 (482.14) | 4.21 (2.61) 0.5% |
145/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.89 mph (32.01 km/h) |
| 25 mph (40.23 km/h) | 24.86 mph (40.02 km/h) |
| 30 mph (48.28 km/h) | 29.84 mph (48.02 km/h) |
| 35 mph (56.33 km/h) | 34.81 mph (56.02 km/h) |
| 40 mph (64.37 km/h) | 39.78 mph (64.02 km/h) |
| 45 mph (72.42 km/h) | 44.76 mph (72.03 km/h) |
| 50 mph (80.47 km/h) | 49.73 mph (80.03 km/h) |
| 55 mph (88.51 km/h) | 54.7 mph (88.03 km/h) |
| 60 mph (96.56 km/h) | 59.67 mph (96.04 km/h) |
| 65 mph (104.61 km/h) | 64.65 mph (104.04 km/h) |
| 70 mph (112.65 km/h) | 69.62 mph (112.04 km/h) |
| 75 mph (120.7 km/h) | 74.59 mph (120.05 km/h) |
| 80 mph (128.75 km/h) | 79.57 mph (128.05 km/h) |
| 85 mph (136.79 km/h) | 84.54 mph (136.05 km/h) |
| 90 mph (144.84 km/h) | 89.51 mph (144.06 km/h) |
| 95 mph (152.89 km/h) | 94.48 mph (152.06 km/h) |
| 100 mph (160.93 km/h) | 99.46 mph (160.06 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1975 | 2294 | 2470 | 2580 | 2697 | 2781 | 2874 | 2983 | 3134 | 3285 | 3453 | 3588 | 3832 | 4100 | 4311 | 4445 | 4521 | 4798 | 5184 | 6025 |
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