Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/85-18 | 35/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.07 (941.7) | 35.03 (889.68) | -2.05 (-52.02) -5.5% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 116.47 (2958.44) | 110.04 (2795.01) | -6.43 (-163.43) -5.5% |
| Sidewall Height inches (mm) | 9.54 (242.25) | 8.51 (216.24) | -1.02 (-26.01) -10.7% |
| Revolutions per mile (km) | 543.98 (338.02) | 575.79 (357.78) | 31.81 (19.76) 5.8% |
35/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.9 mph (30.41 km/h) |
| 25 mph (40.23 km/h) | 23.62 mph (38.01 km/h) |
| 30 mph (48.28 km/h) | 28.34 mph (45.61 km/h) |
| 35 mph (56.33 km/h) | 33.07 mph (53.22 km/h) |
| 40 mph (64.37 km/h) | 37.79 mph (60.82 km/h) |
| 45 mph (72.42 km/h) | 42.51 mph (68.42 km/h) |
| 50 mph (80.47 km/h) | 47.24 mph (76.02 km/h) |
| 55 mph (88.51 km/h) | 51.96 mph (83.62 km/h) |
| 60 mph (96.56 km/h) | 56.69 mph (91.23 km/h) |
| 65 mph (104.61 km/h) | 61.41 mph (98.83 km/h) |
| 70 mph (112.65 km/h) | 66.13 mph (106.43 km/h) |
| 75 mph (120.7 km/h) | 70.86 mph (114.03 km/h) |
| 80 mph (128.75 km/h) | 75.58 mph (121.64 km/h) |
| 85 mph (136.79 km/h) | 80.3 mph (129.24 km/h) |
| 90 mph (144.84 km/h) | 85.03 mph (136.84 km/h) |
| 95 mph (152.89 km/h) | 89.75 mph (144.44 km/h) |
| 100 mph (160.93 km/h) | 94.48 mph (152.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1465 | 1702 | 1833 | 1914 | 2002 | 2064 | 2132 | 2214 | 2326 | 2438 | 2563 | 2662 | 2843 | 3043 | 3199 | 3298 | 3355 | 3560 | 3847 | 4471 |
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