Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/65-18 | 33/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.07 (814.7) | 33.02 (838.8) | 0.95 (24.1) 3% |
| Width inches (mm) | 10.83 (275) | 12.52 (318) | 1.69 (43) 15.6% |
| Circum. inches (mm) | 100.77 (2559.46) | 103.75 (2635.17) | 2.98 (75.71) 3% |
| Sidewall Height inches (mm) | 7.04 (178.75) | 7.51 (190.8) | 0.47 (12.05) 6.7% |
| Revolutions per mile (km) | 628.78 (390.71) | 610.72 (379.48) | -18.07 (-11.23) -2.9% |
33/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.59 mph (33.14 km/h) |
| 25 mph (40.23 km/h) | 25.74 mph (41.42 km/h) |
| 30 mph (48.28 km/h) | 30.89 mph (49.71 km/h) |
| 35 mph (56.33 km/h) | 36.04 mph (57.99 km/h) |
| 40 mph (64.37 km/h) | 41.18 mph (66.28 km/h) |
| 45 mph (72.42 km/h) | 46.33 mph (74.56 km/h) |
| 50 mph (80.47 km/h) | 51.48 mph (82.85 km/h) |
| 55 mph (88.51 km/h) | 56.63 mph (91.13 km/h) |
| 60 mph (96.56 km/h) | 61.77 mph (99.42 km/h) |
| 65 mph (104.61 km/h) | 66.92 mph (107.7 km/h) |
| 70 mph (112.65 km/h) | 72.07 mph (115.99 km/h) |
| 75 mph (120.7 km/h) | 77.22 mph (124.27 km/h) |
| 80 mph (128.75 km/h) | 82.37 mph (132.56 km/h) |
| 85 mph (136.79 km/h) | 87.51 mph (140.84 km/h) |
| 90 mph (144.84 km/h) | 92.66 mph (149.13 km/h) |
| 95 mph (152.89 km/h) | 97.81 mph (157.41 km/h) |
| 100 mph (160.93 km/h) | 102.96 mph (165.7 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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