Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-18 | 33/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.22 (742.2) | 33.02 (838.8) | 3.8 (96.6) 13% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 91.8 (2331.69) | 103.75 (2635.17) | 11.95 (303.48) 13% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 7.51 (190.8) | 1.9 (48.3) 33.9% |
| Revolutions per mile (km) | 690.2 (428.87) | 610.72 (379.48) | -79.49 (-49.39) -11.5% |
33/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.6 mph (36.38 km/h) |
| 25 mph (40.23 km/h) | 28.25 mph (45.47 km/h) |
| 30 mph (48.28 km/h) | 33.9 mph (54.56 km/h) |
| 35 mph (56.33 km/h) | 39.56 mph (63.66 km/h) |
| 40 mph (64.37 km/h) | 45.21 mph (72.75 km/h) |
| 45 mph (72.42 km/h) | 50.86 mph (81.85 km/h) |
| 50 mph (80.47 km/h) | 56.51 mph (90.94 km/h) |
| 55 mph (88.51 km/h) | 62.16 mph (100.03 km/h) |
| 60 mph (96.56 km/h) | 67.81 mph (109.13 km/h) |
| 65 mph (104.61 km/h) | 73.46 mph (118.22 km/h) |
| 70 mph (112.65 km/h) | 79.11 mph (127.32 km/h) |
| 75 mph (120.7 km/h) | 84.76 mph (136.41 km/h) |
| 80 mph (128.75 km/h) | 90.41 mph (145.5 km/h) |
| 85 mph (136.79 km/h) | 96.06 mph (154.6 km/h) |
| 90 mph (144.84 km/h) | 101.71 mph (163.69 km/h) |
| 95 mph (152.89 km/h) | 107.36 mph (172.79 km/h) |
| 100 mph (160.93 km/h) | 113.02 mph (181.88 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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