Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 195/40-18 | 285/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.14 (613.2) | 24.73 (628.2) | 0.59 (15) 2.4% |
| Width inches (mm) | 7.68 (195) | 11.22 (285) | 3.54 (90) 46.2% |
| Circum. inches (mm) | 75.84 (1926.42) | 77.7 (1973.55) | 1.86 (47.12) 2.4% |
| Sidewall Height inches (mm) | 3.07 (78) | 3.37 (85.5) | 0.3 (7.5) 9.6% |
| Revolutions per mile (km) | 835.4 (519.1) | 815.46 (506.7) | -19.95 (-12.39) -2.4% |
285/30-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.49 mph (32.97 km/h) |
| 25 mph (40.23 km/h) | 25.61 mph (41.22 km/h) |
| 30 mph (48.28 km/h) | 30.73 mph (49.46 km/h) |
| 35 mph (56.33 km/h) | 35.86 mph (57.71 km/h) |
| 40 mph (64.37 km/h) | 40.98 mph (65.95 km/h) |
| 45 mph (72.42 km/h) | 46.1 mph (74.19 km/h) |
| 50 mph (80.47 km/h) | 51.22 mph (82.44 km/h) |
| 55 mph (88.51 km/h) | 56.35 mph (90.68 km/h) |
| 60 mph (96.56 km/h) | 61.47 mph (98.92 km/h) |
| 65 mph (104.61 km/h) | 66.59 mph (107.17 km/h) |
| 70 mph (112.65 km/h) | 71.71 mph (115.41 km/h) |
| 75 mph (120.7 km/h) | 76.83 mph (123.65 km/h) |
| 80 mph (128.75 km/h) | 81.96 mph (131.9 km/h) |
| 85 mph (136.79 km/h) | 87.08 mph (140.14 km/h) |
| 90 mph (144.84 km/h) | 92.2 mph (148.38 km/h) |
| 95 mph (152.89 km/h) | 97.32 mph (156.63 km/h) |
| 100 mph (160.93 km/h) | 102.45 mph (164.87 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2075 | 2411 | 2596 | 2711 | 2835 | 2923 | 3020 | 3135 | 3294 | 3453 | 3629 | 3771 | 4027 | 4309 | 4530 | 4671 | 4751 | 5042 | 5448 | 6332 |
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