Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 245/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 27.65 (702.2) | 0.51 (13) 1.9% |
| Width inches (mm) | 5.71 (145) | 9.65 (245) | 3.94 (100) 69% |
| Circum. inches (mm) | 85.24 (2165.19) | 86.85 (2206.03) | 1.61 (40.84) 1.9% |
| Sidewall Height inches (mm) | 4.57 (116) | 4.82 (122.5) | 0.26 (6.5) 5.6% |
| Revolutions per mile (km) | 743.28 (461.85) | 729.52 (453.3) | -13.76 (-8.55) -1.9% |
245/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.38 mph (32.79 km/h) |
| 25 mph (40.23 km/h) | 25.47 mph (40.99 km/h) |
| 30 mph (48.28 km/h) | 30.57 mph (49.19 km/h) |
| 35 mph (56.33 km/h) | 35.66 mph (57.39 km/h) |
| 40 mph (64.37 km/h) | 40.75 mph (65.59 km/h) |
| 45 mph (72.42 km/h) | 45.85 mph (73.79 km/h) |
| 50 mph (80.47 km/h) | 50.94 mph (81.99 km/h) |
| 55 mph (88.51 km/h) | 56.04 mph (90.18 km/h) |
| 60 mph (96.56 km/h) | 61.13 mph (98.38 km/h) |
| 65 mph (104.61 km/h) | 66.23 mph (106.58 km/h) |
| 70 mph (112.65 km/h) | 71.32 mph (114.78 km/h) |
| 75 mph (120.7 km/h) | 76.41 mph (122.98 km/h) |
| 80 mph (128.75 km/h) | 81.51 mph (131.18 km/h) |
| 85 mph (136.79 km/h) | 86.6 mph (139.37 km/h) |
| 90 mph (144.84 km/h) | 91.7 mph (147.57 km/h) |
| 95 mph (152.89 km/h) | 96.79 mph (155.77 km/h) |
| 100 mph (160.93 km/h) | 101.89 mph (163.97 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 |
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