Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 255/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 27.04 (686.7) | -1.34 (-34) -4.7% |
| Width inches (mm) | 6.1 (155) | 10.04 (255) | 3.94 (100) 64.5% |
| Circum. inches (mm) | 89.14 (2264.15) | 84.93 (2157.33) | -4.21 (-106.81) -4.7% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 4.52 (114.75) | -0.67 (-17) -12.9% |
| Revolutions per mile (km) | 710.8 (441.67) | 745.99 (463.53) | 35.19 (21.87) 5% |
255/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.06 mph (30.67 km/h) |
| 25 mph (40.23 km/h) | 23.82 mph (38.34 km/h) |
| 30 mph (48.28 km/h) | 28.58 mph (46 km/h) |
| 35 mph (56.33 km/h) | 33.35 mph (53.67 km/h) |
| 40 mph (64.37 km/h) | 38.11 mph (61.34 km/h) |
| 45 mph (72.42 km/h) | 42.88 mph (69 km/h) |
| 50 mph (80.47 km/h) | 47.64 mph (76.67 km/h) |
| 55 mph (88.51 km/h) | 52.41 mph (84.34 km/h) |
| 60 mph (96.56 km/h) | 57.17 mph (92.01 km/h) |
| 65 mph (104.61 km/h) | 61.93 mph (99.67 km/h) |
| 70 mph (112.65 km/h) | 66.7 mph (107.34 km/h) |
| 75 mph (120.7 km/h) | 71.46 mph (115.01 km/h) |
| 80 mph (128.75 km/h) | 76.23 mph (122.67 km/h) |
| 85 mph (136.79 km/h) | 80.99 mph (130.34 km/h) |
| 90 mph (144.84 km/h) | 85.75 mph (138.01 km/h) |
| 95 mph (152.89 km/h) | 90.52 mph (145.68 km/h) |
| 100 mph (160.93 km/h) | 95.28 mph (153.34 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1898 | 2205 | 2375 | 2480 | 2593 | 2674 | 2763 | 2868 | 3013 | 3159 | 3320 | 3449 | 3684 | 3942 | 4144 | 4273 | 4346 | 4613 | 4984 | 5792 |
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