Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/75-18 | 33/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.6 (929.7) | 33.02 (838.8) | -3.58 (-90.9) -9.8% |
| Width inches (mm) | 12.4 (315) | 12.52 (318) | 0.12 (3) 1% |
| Circum. inches (mm) | 114.99 (2920.74) | 103.75 (2635.17) | -11.24 (-285.57) -9.8% |
| Sidewall Height inches (mm) | 9.3 (236.25) | 7.51 (190.8) | -1.79 (-45.45) -19.2% |
| Revolutions per mile (km) | 551.01 (342.38) | 610.72 (379.48) | 59.71 (37.1) 10.8% |
33/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.04 mph (29.04 km/h) |
| 25 mph (40.23 km/h) | 22.56 mph (36.3 km/h) |
| 30 mph (48.28 km/h) | 27.07 mph (43.56 km/h) |
| 35 mph (56.33 km/h) | 31.58 mph (50.82 km/h) |
| 40 mph (64.37 km/h) | 36.09 mph (58.08 km/h) |
| 45 mph (72.42 km/h) | 40.6 mph (65.34 km/h) |
| 50 mph (80.47 km/h) | 45.11 mph (72.6 km/h) |
| 55 mph (88.51 km/h) | 49.62 mph (79.86 km/h) |
| 60 mph (96.56 km/h) | 54.13 mph (87.12 km/h) |
| 65 mph (104.61 km/h) | 58.64 mph (94.38 km/h) |
| 70 mph (112.65 km/h) | 63.16 mph (101.64 km/h) |
| 75 mph (120.7 km/h) | 67.67 mph (108.9 km/h) |
| 80 mph (128.75 km/h) | 72.18 mph (116.16 km/h) |
| 85 mph (136.79 km/h) | 76.69 mph (123.42 km/h) |
| 90 mph (144.84 km/h) | 81.2 mph (130.68 km/h) |
| 95 mph (152.89 km/h) | 85.71 mph (137.94 km/h) |
| 100 mph (160.93 km/h) | 90.22 mph (145.2 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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