Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-19 | 315/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.15 (689.6) | 27.44 (697) | 0.29 (7.4) 1.1% |
| Width inches (mm) | 13.58 (345) | 12.4 (315) | -1.18 (-30) -8.7% |
| Circum. inches (mm) | 85.29 (2166.44) | 86.21 (2189.69) | 0.92 (23.25) 1.1% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 3.72 (94.5) | -0.35 (-9) -8.7% |
| Revolutions per mile (km) | 742.85 (461.59) | 734.96 (456.68) | -7.89 (-4.9) -1.1% |
315/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.21 mph (32.53 km/h) |
| 25 mph (40.23 km/h) | 25.27 mph (40.67 km/h) |
| 30 mph (48.28 km/h) | 30.32 mph (48.8 km/h) |
| 35 mph (56.33 km/h) | 35.38 mph (56.93 km/h) |
| 40 mph (64.37 km/h) | 40.43 mph (65.06 km/h) |
| 45 mph (72.42 km/h) | 45.48 mph (73.2 km/h) |
| 50 mph (80.47 km/h) | 50.54 mph (81.33 km/h) |
| 55 mph (88.51 km/h) | 55.59 mph (89.46 km/h) |
| 60 mph (96.56 km/h) | 60.64 mph (97.6 km/h) |
| 65 mph (104.61 km/h) | 65.7 mph (105.73 km/h) |
| 70 mph (112.65 km/h) | 70.75 mph (113.86 km/h) |
| 75 mph (120.7 km/h) | 75.8 mph (122 km/h) |
| 80 mph (128.75 km/h) | 80.86 mph (130.13 km/h) |
| 85 mph (136.79 km/h) | 85.91 mph (138.26 km/h) |
| 90 mph (144.84 km/h) | 90.97 mph (146.4 km/h) |
| 95 mph (152.89 km/h) | 96.02 mph (154.53 km/h) |
| 100 mph (160.93 km/h) | 101.07 mph (162.66 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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