Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 31/10-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 31 (787.4) | 4.8 (121.9) 18.3% |
| Width inches (mm) | 12.4 (315) | 10 (254) | -2.4 (-61) -19.4% |
| Circum. inches (mm) | 82.31 (2090.73) | 97.39 (2473.69) | 15.08 (382.96) 18.3% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 5.5 (139.7) | 2.4 (60.95) 77.4% |
| Revolutions per mile (km) | 769.75 (478.3) | 650.58 (404.25) | -119.17 (-74.05) -15.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.66 mph (38.08 km/h) |
| 25 mph (40.23 km/h) | 29.58 mph (47.6 km/h) |
| 30 mph (48.28 km/h) | 35.5 mph (57.12 km/h) |
| 35 mph (56.33 km/h) | 41.41 mph (66.64 km/h) |
| 40 mph (64.37 km/h) | 47.33 mph (76.17 km/h) |
| 45 mph (72.42 km/h) | 53.24 mph (85.69 km/h) |
| 50 mph (80.47 km/h) | 59.16 mph (95.21 km/h) |
| 55 mph (88.51 km/h) | 65.07 mph (104.73 km/h) |
| 60 mph (96.56 km/h) | 70.99 mph (114.25 km/h) |
| 65 mph (104.61 km/h) | 76.91 mph (123.77 km/h) |
| 70 mph (112.65 km/h) | 82.82 mph (133.29 km/h) |
| 75 mph (120.7 km/h) | 88.74 mph (142.81 km/h) |
| 80 mph (128.75 km/h) | 94.65 mph (152.33 km/h) |
| 85 mph (136.79 km/h) | 100.57 mph (161.85 km/h) |
| 90 mph (144.84 km/h) | 106.49 mph (171.37 km/h) |
| 95 mph (152.89 km/h) | 112.4 mph (180.89 km/h) |
| 100 mph (160.93 km/h) | 118.32 mph (190.41 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1656 | 1923 | 2071 | 2163 | 2261 | 2332 | 2409 | 2501 | 2628 | 2755 | 2896 | 3008 | 3213 | 3438 | 3614 | 3727 | 3790 | 4023 | 4347 | 5051 |
Better Fuel Economy Factory Ratios Increased Power
