Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/35-18 | 315/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.58 (649.7) | 27.44 (697) | 1.86 (47.3) 7.3% |
| Width inches (mm) | 10.83 (275) | 12.4 (315) | 1.57 (40) 14.5% |
| Circum. inches (mm) | 80.36 (2041.09) | 86.21 (2189.69) | 5.85 (148.6) 7.3% |
| Sidewall Height inches (mm) | 3.79 (96.25) | 3.72 (94.5) | -0.07 (-1.75) -1.8% |
| Revolutions per mile (km) | 788.47 (489.93) | 734.96 (456.68) | -53.51 (-33.25) -6.8% |
315/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.46 mph (34.53 km/h) |
| 25 mph (40.23 km/h) | 26.82 mph (43.16 km/h) |
| 30 mph (48.28 km/h) | 32.18 mph (51.8 km/h) |
| 35 mph (56.33 km/h) | 37.55 mph (60.43 km/h) |
| 40 mph (64.37 km/h) | 42.91 mph (69.06 km/h) |
| 45 mph (72.42 km/h) | 48.28 mph (77.69 km/h) |
| 50 mph (80.47 km/h) | 53.64 mph (86.33 km/h) |
| 55 mph (88.51 km/h) | 59 mph (94.96 km/h) |
| 60 mph (96.56 km/h) | 64.37 mph (103.59 km/h) |
| 65 mph (104.61 km/h) | 69.73 mph (112.22 km/h) |
| 70 mph (112.65 km/h) | 75.1 mph (120.86 km/h) |
| 75 mph (120.7 km/h) | 80.46 mph (129.49 km/h) |
| 80 mph (128.75 km/h) | 85.82 mph (138.12 km/h) |
| 85 mph (136.79 km/h) | 91.19 mph (146.75 km/h) |
| 90 mph (144.84 km/h) | 96.55 mph (155.39 km/h) |
| 95 mph (152.89 km/h) | 101.92 mph (164.02 km/h) |
| 100 mph (160.93 km/h) | 107.28 mph (172.65 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1870 | 2173 | 2340 | 2443 | 2555 | 2634 | 2722 | 2825 | 2969 | 3112 | 3271 | 3398 | 3629 | 3884 | 4083 | 4210 | 4282 | 4545 | 4911 | 5707 |
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