Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/65-20 | 33/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.49 (774.5) | 33.02 (838.8) | 2.53 (64.3) 8.3% |
| Width inches (mm) | 8.07 (205) | 12.52 (318) | 4.45 (113) 55.1% |
| Circum. inches (mm) | 95.79 (2433.16) | 103.75 (2635.17) | 7.95 (202) 8.3% |
| Sidewall Height inches (mm) | 5.25 (133.25) | 7.51 (190.8) | 2.27 (57.55) 43.2% |
| Revolutions per mile (km) | 661.42 (410.99) | 610.72 (379.48) | -50.7 (-31.51) -7.7% |
33/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.66 mph (34.86 km/h) |
| 25 mph (40.23 km/h) | 27.08 mph (43.57 km/h) |
| 30 mph (48.28 km/h) | 32.49 mph (52.29 km/h) |
| 35 mph (56.33 km/h) | 37.91 mph (61 km/h) |
| 40 mph (64.37 km/h) | 43.32 mph (69.72 km/h) |
| 45 mph (72.42 km/h) | 48.74 mph (78.43 km/h) |
| 50 mph (80.47 km/h) | 54.15 mph (87.15 km/h) |
| 55 mph (88.51 km/h) | 59.57 mph (95.86 km/h) |
| 60 mph (96.56 km/h) | 64.98 mph (104.58 km/h) |
| 65 mph (104.61 km/h) | 70.4 mph (113.29 km/h) |
| 70 mph (112.65 km/h) | 75.81 mph (122.01 km/h) |
| 75 mph (120.7 km/h) | 81.23 mph (130.72 km/h) |
| 80 mph (128.75 km/h) | 86.64 mph (139.44 km/h) |
| 85 mph (136.79 km/h) | 92.06 mph (148.15 km/h) |
| 90 mph (144.84 km/h) | 97.47 mph (156.87 km/h) |
| 95 mph (152.89 km/h) | 102.89 mph (165.58 km/h) |
| 100 mph (160.93 km/h) | 108.3 mph (174.3 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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