Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/60-18 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.1 (739.2) | 28.68 (728.5) | -0.42 (-10.7) -1.4% |
| Width inches (mm) | 9.25 (235) | 9.65 (245) | 0.39 (10) 4.3% |
| Circum. inches (mm) | 91.43 (2322.27) | 90.1 (2288.65) | -1.32 (-33.62) -1.4% |
| Sidewall Height inches (mm) | 5.55 (141) | 4.34 (110.25) | -1.21 (-30.75) -21.8% |
| Revolutions per mile (km) | 693.01 (430.61) | 703.18 (436.94) | 10.18 (6.32) 1.5% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.71 mph (31.72 km/h) |
| 25 mph (40.23 km/h) | 24.64 mph (39.65 km/h) |
| 30 mph (48.28 km/h) | 29.57 mph (47.58 km/h) |
| 35 mph (56.33 km/h) | 34.49 mph (55.51 km/h) |
| 40 mph (64.37 km/h) | 39.42 mph (63.44 km/h) |
| 45 mph (72.42 km/h) | 44.35 mph (71.37 km/h) |
| 50 mph (80.47 km/h) | 49.28 mph (79.3 km/h) |
| 55 mph (88.51 km/h) | 54.2 mph (87.23 km/h) |
| 60 mph (96.56 km/h) | 59.13 mph (95.16 km/h) |
| 65 mph (104.61 km/h) | 64.06 mph (103.09 km/h) |
| 70 mph (112.65 km/h) | 68.99 mph (111.02 km/h) |
| 75 mph (120.7 km/h) | 73.91 mph (118.95 km/h) |
| 80 mph (128.75 km/h) | 78.84 mph (126.88 km/h) |
| 85 mph (136.79 km/h) | 83.77 mph (134.81 km/h) |
| 90 mph (144.84 km/h) | 88.7 mph (142.74 km/h) |
| 95 mph (152.89 km/h) | 93.62 mph (150.67 km/h) |
| 100 mph (160.93 km/h) | 98.55 mph (158.61 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1789 | 2079 | 2239 | 2338 | 2444 | 2520 | 2604 | 2703 | 2840 | 2977 | 3130 | 3252 | 3472 | 3716 | 3906 | 4028 | 4097 | 4348 | 4698 | 5460 |
Better Fuel Economy Factory Ratios Increased Power
