Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 145/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 25.99 (660.2) | -1.14 (-29) -4.2% |
| Width inches (mm) | 5.71 (145) | 5.71 (145) | 0 (0) 0% |
| Circum. inches (mm) | 85.24 (2165.19) | 81.66 (2074.08) | -3.59 (-91.11) -4.2% |
| Sidewall Height inches (mm) | 4.57 (116) | 4 (101.5) | -0.57 (-14.5) -12.5% |
| Revolutions per mile (km) | 743.28 (461.85) | 775.93 (482.14) | 32.65 (20.29) 4.4% |
145/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.16 mph (30.83 km/h) |
| 25 mph (40.23 km/h) | 23.95 mph (38.54 km/h) |
| 30 mph (48.28 km/h) | 28.74 mph (46.25 km/h) |
| 35 mph (56.33 km/h) | 33.53 mph (53.96 km/h) |
| 40 mph (64.37 km/h) | 38.32 mph (61.67 km/h) |
| 45 mph (72.42 km/h) | 43.11 mph (69.37 km/h) |
| 50 mph (80.47 km/h) | 47.9 mph (77.08 km/h) |
| 55 mph (88.51 km/h) | 52.69 mph (84.79 km/h) |
| 60 mph (96.56 km/h) | 57.48 mph (92.5 km/h) |
| 65 mph (104.61 km/h) | 62.26 mph (100.21 km/h) |
| 70 mph (112.65 km/h) | 67.05 mph (107.91 km/h) |
| 75 mph (120.7 km/h) | 71.84 mph (115.62 km/h) |
| 80 mph (128.75 km/h) | 76.63 mph (123.33 km/h) |
| 85 mph (136.79 km/h) | 81.42 mph (131.04 km/h) |
| 90 mph (144.84 km/h) | 86.21 mph (138.75 km/h) |
| 95 mph (152.89 km/h) | 91 mph (146.45 km/h) |
| 100 mph (160.93 km/h) | 95.79 mph (154.16 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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