Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/65-18 | 33/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.61 (853.7) | 33.02 (838.8) | -0.59 (-14.9) -1.7% |
| Width inches (mm) | 12.01 (305) | 12.52 (318) | 0.51 (13) 4.3% |
| Circum. inches (mm) | 105.59 (2681.98) | 103.75 (2635.17) | -1.84 (-46.81) -1.7% |
| Sidewall Height inches (mm) | 7.81 (198.25) | 7.51 (190.8) | -0.29 (-7.45) -3.8% |
| Revolutions per mile (km) | 600.06 (372.86) | 610.72 (379.48) | 10.66 (6.62) 1.8% |
33/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.65 mph (31.63 km/h) |
| 25 mph (40.23 km/h) | 24.56 mph (39.53 km/h) |
| 30 mph (48.28 km/h) | 29.48 mph (47.44 km/h) |
| 35 mph (56.33 km/h) | 34.39 mph (55.34 km/h) |
| 40 mph (64.37 km/h) | 39.3 mph (63.25 km/h) |
| 45 mph (72.42 km/h) | 44.21 mph (71.16 km/h) |
| 50 mph (80.47 km/h) | 49.13 mph (79.06 km/h) |
| 55 mph (88.51 km/h) | 54.04 mph (86.97 km/h) |
| 60 mph (96.56 km/h) | 58.95 mph (94.88 km/h) |
| 65 mph (104.61 km/h) | 63.87 mph (102.78 km/h) |
| 70 mph (112.65 km/h) | 68.78 mph (110.69 km/h) |
| 75 mph (120.7 km/h) | 73.69 mph (118.59 km/h) |
| 80 mph (128.75 km/h) | 78.6 mph (126.5 km/h) |
| 85 mph (136.79 km/h) | 83.52 mph (134.41 km/h) |
| 90 mph (144.84 km/h) | 88.43 mph (142.31 km/h) |
| 95 mph (152.89 km/h) | 93.34 mph (150.22 km/h) |
| 100 mph (160.93 km/h) | 98.25 mph (158.13 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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