Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-18 | 245/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.72 (653.2) | 27.65 (702.2) | 1.93 (49) 7.5% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 80.79 (2052.09) | 86.85 (2206.03) | 6.06 (153.94) 7.5% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.82 (122.5) | 0.96 (24.5) 25% |
| Revolutions per mile (km) | 784.25 (487.31) | 729.52 (453.3) | -54.73 (-34) -7% |
245/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.5 mph (34.6 km/h) |
| 25 mph (40.23 km/h) | 26.88 mph (43.25 km/h) |
| 30 mph (48.28 km/h) | 32.25 mph (51.9 km/h) |
| 35 mph (56.33 km/h) | 37.63 mph (60.55 km/h) |
| 40 mph (64.37 km/h) | 43 mph (69.2 km/h) |
| 45 mph (72.42 km/h) | 48.38 mph (77.85 km/h) |
| 50 mph (80.47 km/h) | 53.75 mph (86.5 km/h) |
| 55 mph (88.51 km/h) | 59.13 mph (95.15 km/h) |
| 60 mph (96.56 km/h) | 64.5 mph (103.8 km/h) |
| 65 mph (104.61 km/h) | 69.88 mph (112.45 km/h) |
| 70 mph (112.65 km/h) | 75.25 mph (121.11 km/h) |
| 75 mph (120.7 km/h) | 80.63 mph (129.76 km/h) |
| 80 mph (128.75 km/h) | 86 mph (138.41 km/h) |
| 85 mph (136.79 km/h) | 91.38 mph (147.06 km/h) |
| 90 mph (144.84 km/h) | 96.75 mph (155.71 km/h) |
| 95 mph (152.89 km/h) | 102.13 mph (164.36 km/h) |
| 100 mph (160.93 km/h) | 107.5 mph (173.01 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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