Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 305/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 35.61 (904.5) | 9.41 (239) 35.9% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 82.31 (2090.73) | 111.87 (2841.57) | 29.56 (750.84) 35.9% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 7.81 (198.25) | 4.7 (119.5) 151.7% |
| Revolutions per mile (km) | 769.75 (478.3) | 566.36 (351.92) | -203.4 (-126.38) -26.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.18 mph (43.75 km/h) |
| 25 mph (40.23 km/h) | 33.98 mph (54.68 km/h) |
| 30 mph (48.28 km/h) | 40.77 mph (65.62 km/h) |
| 35 mph (56.33 km/h) | 47.57 mph (76.56 km/h) |
| 40 mph (64.37 km/h) | 54.37 mph (87.49 km/h) |
| 45 mph (72.42 km/h) | 61.16 mph (98.43 km/h) |
| 50 mph (80.47 km/h) | 67.96 mph (109.37 km/h) |
| 55 mph (88.51 km/h) | 74.75 mph (120.3 km/h) |
| 60 mph (96.56 km/h) | 81.55 mph (131.24 km/h) |
| 65 mph (104.61 km/h) | 88.34 mph (142.18 km/h) |
| 70 mph (112.65 km/h) | 95.14 mph (153.11 km/h) |
| 75 mph (120.7 km/h) | 101.93 mph (164.05 km/h) |
| 80 mph (128.75 km/h) | 108.73 mph (174.98 km/h) |
| 85 mph (136.79 km/h) | 115.53 mph (185.92 km/h) |
| 90 mph (144.84 km/h) | 122.32 mph (196.86 km/h) |
| 95 mph (152.89 km/h) | 129.12 mph (207.79 km/h) |
| 100 mph (160.93 km/h) | 135.91 mph (218.73 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1441 | 1674 | 1803 | 1883 | 1969 | 2030 | 2098 | 2177 | 2288 | 2398 | 2521 | 2619 | 2797 | 2993 | 3146 | 3244 | 3300 | 3502 | 3784 | 4397 |
Better Fuel Economy Factory Ratios Increased Power
