Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/25-20 | 245/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.41 (645.5) | 27.65 (702.2) | 2.23 (56.7) 8.8% |
| Width inches (mm) | 10.83 (275) | 9.65 (245) | -1.18 (-30) -10.9% |
| Circum. inches (mm) | 79.84 (2027.9) | 86.85 (2206.03) | 7.01 (178.13) 8.8% |
| Sidewall Height inches (mm) | 2.71 (68.75) | 4.82 (122.5) | 2.12 (53.75) 78.2% |
| Revolutions per mile (km) | 793.6 (493.12) | 729.52 (453.3) | -64.08 (-39.82) -8.1% |
245/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.76 mph (35.01 km/h) |
| 25 mph (40.23 km/h) | 27.2 mph (43.77 km/h) |
| 30 mph (48.28 km/h) | 32.64 mph (52.52 km/h) |
| 35 mph (56.33 km/h) | 38.07 mph (61.27 km/h) |
| 40 mph (64.37 km/h) | 43.51 mph (70.03 km/h) |
| 45 mph (72.42 km/h) | 48.95 mph (78.78 km/h) |
| 50 mph (80.47 km/h) | 54.39 mph (87.54 km/h) |
| 55 mph (88.51 km/h) | 59.83 mph (96.29 km/h) |
| 60 mph (96.56 km/h) | 65.27 mph (105.04 km/h) |
| 65 mph (104.61 km/h) | 70.71 mph (113.8 km/h) |
| 70 mph (112.65 km/h) | 76.15 mph (122.55 km/h) |
| 75 mph (120.7 km/h) | 81.59 mph (131.3 km/h) |
| 80 mph (128.75 km/h) | 87.03 mph (140.06 km/h) |
| 85 mph (136.79 km/h) | 92.47 mph (148.81 km/h) |
| 90 mph (144.84 km/h) | 97.91 mph (157.56 km/h) |
| 95 mph (152.89 km/h) | 103.34 mph (166.32 km/h) |
| 100 mph (160.93 km/h) | 108.78 mph (175.07 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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