Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-20 | 315/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.66 (728) | 27.44 (697) | -1.22 (-31) -4.3% |
| Width inches (mm) | 10.83 (275) | 12.4 (315) | 1.57 (40) 14.5% |
| Circum. inches (mm) | 90.04 (2287.08) | 86.21 (2189.69) | -3.83 (-97.39) -4.3% |
| Sidewall Height inches (mm) | 4.33 (110) | 3.72 (94.5) | -0.61 (-15.5) -14.1% |
| Revolutions per mile (km) | 703.67 (437.24) | 734.96 (456.68) | 31.3 (19.45) 4.4% |
315/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.15 mph (30.82 km/h) |
| 25 mph (40.23 km/h) | 23.94 mph (38.52 km/h) |
| 30 mph (48.28 km/h) | 28.72 mph (46.22 km/h) |
| 35 mph (56.33 km/h) | 33.51 mph (53.93 km/h) |
| 40 mph (64.37 km/h) | 38.3 mph (61.63 km/h) |
| 45 mph (72.42 km/h) | 43.08 mph (69.34 km/h) |
| 50 mph (80.47 km/h) | 47.87 mph (77.04 km/h) |
| 55 mph (88.51 km/h) | 52.66 mph (84.74 km/h) |
| 60 mph (96.56 km/h) | 57.45 mph (92.45 km/h) |
| 65 mph (104.61 km/h) | 62.23 mph (100.15 km/h) |
| 70 mph (112.65 km/h) | 67.02 mph (107.86 km/h) |
| 75 mph (120.7 km/h) | 71.81 mph (115.56 km/h) |
| 80 mph (128.75 km/h) | 76.59 mph (123.27 km/h) |
| 85 mph (136.79 km/h) | 81.38 mph (130.97 km/h) |
| 90 mph (144.84 km/h) | 86.17 mph (138.67 km/h) |
| 95 mph (152.89 km/h) | 90.95 mph (146.38 km/h) |
| 100 mph (160.93 km/h) | 95.74 mph (154.08 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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