Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/70-20 | 315/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.81 (935) | 37.36 (949) | 0.55 (14) 1.5% |
| Width inches (mm) | 12.01 (305) | 12.4 (315) | 0.39 (10) 3.3% |
| Circum. inches (mm) | 115.65 (2937.39) | 117.38 (2981.37) | 1.73 (43.98) 1.5% |
| Sidewall Height inches (mm) | 8.41 (213.5) | 8.68 (220.5) | 0.28 (7) 3.3% |
| Revolutions per mile (km) | 547.88 (340.44) | 539.8 (335.42) | -8.08 (-5.02) -1.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.3 mph (32.67 km/h) |
| 25 mph (40.23 km/h) | 25.37 mph (40.84 km/h) |
| 30 mph (48.28 km/h) | 30.45 mph (49 km/h) |
| 35 mph (56.33 km/h) | 35.52 mph (57.17 km/h) |
| 40 mph (64.37 km/h) | 40.6 mph (65.34 km/h) |
| 45 mph (72.42 km/h) | 45.67 mph (73.5 km/h) |
| 50 mph (80.47 km/h) | 50.75 mph (81.67 km/h) |
| 55 mph (88.51 km/h) | 55.82 mph (89.84 km/h) |
| 60 mph (96.56 km/h) | 60.9 mph (98.01 km/h) |
| 65 mph (104.61 km/h) | 65.97 mph (106.17 km/h) |
| 70 mph (112.65 km/h) | 71.05 mph (114.34 km/h) |
| 75 mph (120.7 km/h) | 76.12 mph (122.51 km/h) |
| 80 mph (128.75 km/h) | 81.2 mph (130.68 km/h) |
| 85 mph (136.79 km/h) | 86.27 mph (138.84 km/h) |
| 90 mph (144.84 km/h) | 91.35 mph (147.01 km/h) |
| 95 mph (152.89 km/h) | 96.42 mph (155.18 km/h) |
| 100 mph (160.93 km/h) | 101.5 mph (163.34 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1374 | 1596 | 1719 | 1795 | 1876 | 1935 | 1999 | 2075 | 2180 | 2286 | 2402 | 2496 | 2666 | 2853 | 2999 | 3092 | 3145 | 3338 | 3607 | 4191 |
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