Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/50-20 | 245/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.65 (753) | 27.65 (702.2) | -2 (-50.8) -6.7% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 93.13 (2365.62) | 86.85 (2206.03) | -6.28 (-159.59) -6.7% |
| Sidewall Height inches (mm) | 4.82 (122.5) | 4.82 (122.5) | 0 (0) 0% |
| Revolutions per mile (km) | 680.31 (422.72) | 729.52 (453.3) | 49.22 (30.58) 7.2% |
245/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.65 mph (30.02 km/h) |
| 25 mph (40.23 km/h) | 23.31 mph (37.52 km/h) |
| 30 mph (48.28 km/h) | 27.98 mph (45.02 km/h) |
| 35 mph (56.33 km/h) | 32.64 mph (52.53 km/h) |
| 40 mph (64.37 km/h) | 37.3 mph (60.03 km/h) |
| 45 mph (72.42 km/h) | 41.96 mph (67.53 km/h) |
| 50 mph (80.47 km/h) | 46.63 mph (75.04 km/h) |
| 55 mph (88.51 km/h) | 51.29 mph (82.54 km/h) |
| 60 mph (96.56 km/h) | 55.95 mph (90.05 km/h) |
| 65 mph (104.61 km/h) | 60.61 mph (97.55 km/h) |
| 70 mph (112.65 km/h) | 65.28 mph (105.05 km/h) |
| 75 mph (120.7 km/h) | 69.94 mph (112.56 km/h) |
| 80 mph (128.75 km/h) | 74.6 mph (120.06 km/h) |
| 85 mph (136.79 km/h) | 79.27 mph (127.57 km/h) |
| 90 mph (144.84 km/h) | 83.93 mph (135.07 km/h) |
| 95 mph (152.89 km/h) | 88.59 mph (142.57 km/h) |
| 100 mph (160.93 km/h) | 93.25 mph (150.08 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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