Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-18 | 245/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 27.65 (702.2) | 1.61 (41) 6.2% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 81.78 (2077.22) | 86.85 (2206.03) | 5.07 (128.81) 6.2% |
| Sidewall Height inches (mm) | 4.02 (102) | 4.82 (122.5) | 0.81 (20.5) 20.1% |
| Revolutions per mile (km) | 774.76 (481.41) | 729.52 (453.3) | -45.24 (-28.11) -5.8% |
245/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.24 mph (34.18 km/h) |
| 25 mph (40.23 km/h) | 26.55 mph (42.73 km/h) |
| 30 mph (48.28 km/h) | 31.86 mph (51.27 km/h) |
| 35 mph (56.33 km/h) | 37.17 mph (59.82 km/h) |
| 40 mph (64.37 km/h) | 42.48 mph (68.37 km/h) |
| 45 mph (72.42 km/h) | 47.79 mph (76.91 km/h) |
| 50 mph (80.47 km/h) | 53.1 mph (85.46 km/h) |
| 55 mph (88.51 km/h) | 58.41 mph (94 km/h) |
| 60 mph (96.56 km/h) | 63.72 mph (102.55 km/h) |
| 65 mph (104.61 km/h) | 69.03 mph (111.09 km/h) |
| 70 mph (112.65 km/h) | 74.34 mph (119.64 km/h) |
| 75 mph (120.7 km/h) | 79.65 mph (128.19 km/h) |
| 80 mph (128.75 km/h) | 84.96 mph (136.73 km/h) |
| 85 mph (136.79 km/h) | 90.27 mph (145.28 km/h) |
| 90 mph (144.84 km/h) | 95.58 mph (153.82 km/h) |
| 95 mph (152.89 km/h) | 100.89 mph (162.37 km/h) |
| 100 mph (160.93 km/h) | 106.2 mph (170.91 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1856 | 2157 | 2323 | 2425 | 2536 | 2615 | 2702 | 2804 | 2947 | 3089 | 3247 | 3373 | 3602 | 3855 | 4053 | 4179 | 4250 | 4511 | 4874 | 5664 |
Better Fuel Economy Factory Ratios Increased Power
