Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/11.5-20 | 305/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.01 (940.16) | 35.61 (904.5) | -1.4 (-35.66) -3.8% |
| Width inches (mm) | 11.5 (292) | 12.01 (305) | 0.51 (13) 4.5% |
| Circum. inches (mm) | 116.28 (2953.6) | 111.87 (2841.57) | -4.41 (-112.03) -3.8% |
| Sidewall Height inches (mm) | 8.51 (216.08) | 7.81 (198.25) | -0.7 (-17.83) -8.3% |
| Revolutions per mile (km) | 544.88 (338.57) | 566.36 (351.92) | 21.48 (13.35) 3.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.24 mph (30.97 km/h) |
| 25 mph (40.23 km/h) | 24.05 mph (38.71 km/h) |
| 30 mph (48.28 km/h) | 28.86 mph (46.45 km/h) |
| 35 mph (56.33 km/h) | 33.67 mph (54.19 km/h) |
| 40 mph (64.37 km/h) | 38.48 mph (61.93 km/h) |
| 45 mph (72.42 km/h) | 43.29 mph (69.67 km/h) |
| 50 mph (80.47 km/h) | 48.1 mph (77.42 km/h) |
| 55 mph (88.51 km/h) | 52.91 mph (85.16 km/h) |
| 60 mph (96.56 km/h) | 57.72 mph (92.9 km/h) |
| 65 mph (104.61 km/h) | 62.53 mph (100.64 km/h) |
| 70 mph (112.65 km/h) | 67.34 mph (108.38 km/h) |
| 75 mph (120.7 km/h) | 72.16 mph (116.12 km/h) |
| 80 mph (128.75 km/h) | 76.97 mph (123.86 km/h) |
| 85 mph (136.79 km/h) | 81.78 mph (131.61 km/h) |
| 90 mph (144.84 km/h) | 86.59 mph (139.35 km/h) |
| 95 mph (152.89 km/h) | 91.4 mph (147.09 km/h) |
| 100 mph (160.93 km/h) | 96.21 mph (154.83 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
