Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/60-18 | 33/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.41 (823.2) | 33.02 (838.8) | 0.61 (15.6) 1.9% |
| Width inches (mm) | 12.01 (305) | 12.52 (318) | 0.51 (13) 4.3% |
| Circum. inches (mm) | 101.82 (2586.16) | 103.75 (2635.17) | 1.93 (49.01) 1.9% |
| Sidewall Height inches (mm) | 7.2 (183) | 7.51 (190.8) | 0.31 (7.8) 4.3% |
| Revolutions per mile (km) | 622.29 (386.67) | 610.72 (379.48) | -11.57 (-7.19) -1.9% |
33/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.38 mph (32.8 km/h) |
| 25 mph (40.23 km/h) | 25.47 mph (41 km/h) |
| 30 mph (48.28 km/h) | 30.57 mph (49.2 km/h) |
| 35 mph (56.33 km/h) | 35.66 mph (57.39 km/h) |
| 40 mph (64.37 km/h) | 40.76 mph (65.59 km/h) |
| 45 mph (72.42 km/h) | 45.85 mph (73.79 km/h) |
| 50 mph (80.47 km/h) | 50.95 mph (81.99 km/h) |
| 55 mph (88.51 km/h) | 56.04 mph (90.19 km/h) |
| 60 mph (96.56 km/h) | 61.14 mph (98.39 km/h) |
| 65 mph (104.61 km/h) | 66.23 mph (106.59 km/h) |
| 70 mph (112.65 km/h) | 71.33 mph (114.79 km/h) |
| 75 mph (120.7 km/h) | 76.42 mph (122.99 km/h) |
| 80 mph (128.75 km/h) | 81.52 mph (131.19 km/h) |
| 85 mph (136.79 km/h) | 86.61 mph (139.39 km/h) |
| 90 mph (144.84 km/h) | 91.71 mph (147.59 km/h) |
| 95 mph (152.89 km/h) | 96.8 mph (155.79 km/h) |
| 100 mph (160.93 km/h) | 101.9 mph (163.98 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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