Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 115/85-18 | 135/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.7 (652.7) | 26.5 (673.2) | 0.81 (20.5) 3.1% |
| Width inches (mm) | 4.53 (115) | 5.31 (135) | 0.79 (20) 17.4% |
| Circum. inches (mm) | 80.73 (2050.52) | 83.26 (2114.92) | 2.54 (64.4) 3.1% |
| Sidewall Height inches (mm) | 3.85 (97.75) | 4.25 (108) | 0.4 (10.25) 10.5% |
| Revolutions per mile (km) | 784.85 (487.68) | 760.95 (472.83) | -23.9 (-14.85) -3% |
135/80-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.63 mph (33.2 km/h) |
| 25 mph (40.23 km/h) | 25.79 mph (41.5 km/h) |
| 30 mph (48.28 km/h) | 30.94 mph (49.8 km/h) |
| 35 mph (56.33 km/h) | 36.1 mph (58.1 km/h) |
| 40 mph (64.37 km/h) | 41.26 mph (66.4 km/h) |
| 45 mph (72.42 km/h) | 46.41 mph (74.7 km/h) |
| 50 mph (80.47 km/h) | 51.57 mph (82.99 km/h) |
| 55 mph (88.51 km/h) | 56.73 mph (91.29 km/h) |
| 60 mph (96.56 km/h) | 61.88 mph (99.59 km/h) |
| 65 mph (104.61 km/h) | 67.04 mph (107.89 km/h) |
| 70 mph (112.65 km/h) | 72.2 mph (116.19 km/h) |
| 75 mph (120.7 km/h) | 77.36 mph (124.49 km/h) |
| 80 mph (128.75 km/h) | 82.51 mph (132.79 km/h) |
| 85 mph (136.79 km/h) | 87.67 mph (141.09 km/h) |
| 90 mph (144.84 km/h) | 92.83 mph (149.39 km/h) |
| 95 mph (152.89 km/h) | 97.98 mph (157.69 km/h) |
| 100 mph (160.93 km/h) | 103.14 mph (165.99 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1936 | 2250 | 2423 | 2530 | 2645 | 2728 | 2818 | 2925 | 3074 | 3222 | 3387 | 3519 | 3758 | 4021 | 4227 | 4359 | 4433 | 4705 | 5084 | 5908 |
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