Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/60-20 | 305/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.8 (706) | 30.81 (782.5) | 3.01 (76.5) 10.8% |
| Width inches (mm) | 6.5 (165) | 12.01 (305) | 5.51 (140) 84.8% |
| Circum. inches (mm) | 87.32 (2217.96) | 96.78 (2458.3) | 9.46 (240.33) 10.8% |
| Sidewall Height inches (mm) | 3.9 (99) | 5.4 (137.25) | 1.51 (38.25) 38.6% |
| Revolutions per mile (km) | 725.6 (450.86) | 654.66 (406.79) | -70.94 (-44.08) -9.8% |
305/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.17 mph (35.67 km/h) |
| 25 mph (40.23 km/h) | 27.71 mph (44.59 km/h) |
| 30 mph (48.28 km/h) | 33.25 mph (53.51 km/h) |
| 35 mph (56.33 km/h) | 38.79 mph (62.43 km/h) |
| 40 mph (64.37 km/h) | 44.33 mph (71.35 km/h) |
| 45 mph (72.42 km/h) | 49.88 mph (80.27 km/h) |
| 50 mph (80.47 km/h) | 55.42 mph (89.19 km/h) |
| 55 mph (88.51 km/h) | 60.96 mph (98.11 km/h) |
| 60 mph (96.56 km/h) | 66.5 mph (107.02 km/h) |
| 65 mph (104.61 km/h) | 72.04 mph (115.94 km/h) |
| 70 mph (112.65 km/h) | 77.58 mph (124.86 km/h) |
| 75 mph (120.7 km/h) | 83.13 mph (133.78 km/h) |
| 80 mph (128.75 km/h) | 88.67 mph (142.7 km/h) |
| 85 mph (136.79 km/h) | 94.21 mph (151.62 km/h) |
| 90 mph (144.84 km/h) | 99.75 mph (160.54 km/h) |
| 95 mph (152.89 km/h) | 105.29 mph (169.45 km/h) |
| 100 mph (160.93 km/h) | 110.84 mph (178.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1666 | 1935 | 2084 | 2176 | 2276 | 2347 | 2425 | 2517 | 2644 | 2772 | 2914 | 3027 | 3233 | 3460 | 3637 | 3750 | 3814 | 4048 | 4374 | 5083 |
Better Fuel Economy Factory Ratios Increased Power
