Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/40-19 | 315/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.92 (734.6) | 27.44 (697) | -1.48 (-37.6) -5.1% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 90.86 (2307.81) | 86.21 (2189.69) | -4.65 (-118.12) -5.1% |
| Sidewall Height inches (mm) | 4.96 (126) | 3.72 (94.5) | -1.24 (-31.5) -25% |
| Revolutions per mile (km) | 697.35 (433.31) | 734.96 (456.68) | 37.62 (23.38) 5.4% |
315/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.98 mph (30.54 km/h) |
| 25 mph (40.23 km/h) | 23.72 mph (38.17 km/h) |
| 30 mph (48.28 km/h) | 28.46 mph (45.81 km/h) |
| 35 mph (56.33 km/h) | 33.21 mph (53.44 km/h) |
| 40 mph (64.37 km/h) | 37.95 mph (61.08 km/h) |
| 45 mph (72.42 km/h) | 42.7 mph (68.71 km/h) |
| 50 mph (80.47 km/h) | 47.44 mph (76.35 km/h) |
| 55 mph (88.51 km/h) | 52.18 mph (83.98 km/h) |
| 60 mph (96.56 km/h) | 56.93 mph (91.62 km/h) |
| 65 mph (104.61 km/h) | 61.67 mph (99.25 km/h) |
| 70 mph (112.65 km/h) | 66.42 mph (106.89 km/h) |
| 75 mph (120.7 km/h) | 71.16 mph (114.52 km/h) |
| 80 mph (128.75 km/h) | 75.91 mph (122.16 km/h) |
| 85 mph (136.79 km/h) | 80.65 mph (129.79 km/h) |
| 90 mph (144.84 km/h) | 85.39 mph (137.43 km/h) |
| 95 mph (152.89 km/h) | 90.14 mph (145.06 km/h) |
| 100 mph (160.93 km/h) | 94.88 mph (152.7 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1870 | 2173 | 2340 | 2443 | 2555 | 2634 | 2722 | 2825 | 2969 | 3112 | 3271 | 3398 | 3629 | 3884 | 4083 | 4210 | 4282 | 4545 | 4911 | 5707 |
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