Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/55-18 | 33/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.34 (770.7) | 33.02 (838.8) | 2.68 (68.1) 8.8% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 95.32 (2421.23) | 103.75 (2635.17) | 8.42 (213.94) 8.8% |
| Sidewall Height inches (mm) | 6.17 (156.75) | 7.51 (190.8) | 1.34 (34.05) 21.7% |
| Revolutions per mile (km) | 664.68 (413.01) | 610.72 (379.48) | -53.96 (-33.53) -8.1% |
33/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.77 mph (35.03 km/h) |
| 25 mph (40.23 km/h) | 27.21 mph (43.79 km/h) |
| 30 mph (48.28 km/h) | 32.65 mph (52.55 km/h) |
| 35 mph (56.33 km/h) | 38.09 mph (61.3 km/h) |
| 40 mph (64.37 km/h) | 43.53 mph (70.06 km/h) |
| 45 mph (72.42 km/h) | 48.98 mph (78.82 km/h) |
| 50 mph (80.47 km/h) | 54.42 mph (87.58 km/h) |
| 55 mph (88.51 km/h) | 59.86 mph (96.34 km/h) |
| 60 mph (96.56 km/h) | 65.3 mph (105.09 km/h) |
| 65 mph (104.61 km/h) | 70.74 mph (113.85 km/h) |
| 70 mph (112.65 km/h) | 76.19 mph (122.61 km/h) |
| 75 mph (120.7 km/h) | 81.63 mph (131.37 km/h) |
| 80 mph (128.75 km/h) | 87.07 mph (140.12 km/h) |
| 85 mph (136.79 km/h) | 92.51 mph (148.88 km/h) |
| 90 mph (144.84 km/h) | 97.95 mph (157.64 km/h) |
| 95 mph (152.89 km/h) | 103.39 mph (166.4 km/h) |
| 100 mph (160.93 km/h) | 108.84 mph (175.16 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1554 | 1805 | 1944 | 2030 | 2123 | 2189 | 2262 | 2348 | 2467 | 2586 | 2718 | 2824 | 3016 | 3227 | 3393 | 3499 | 3558 | 3776 | 4080 | 4742 |
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