Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/50-17 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.28 (616.8) | 26.68 (677.7) | 2.4 (60.9) 9.9% |
| Width inches (mm) | 7.28 (185) | 9.65 (245) | 2.36 (60) 32.4% |
| Circum. inches (mm) | 76.29 (1937.73) | 83.82 (2129.06) | 7.53 (191.32) 9.9% |
| Sidewall Height inches (mm) | 3.64 (92.5) | 4.34 (110.25) | 0.7 (17.75) 19.2% |
| Revolutions per mile (km) | 830.53 (516.07) | 755.9 (469.69) | -74.63 (-46.38) -9% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.97 mph (35.36 km/h) |
| 25 mph (40.23 km/h) | 27.47 mph (44.21 km/h) |
| 30 mph (48.28 km/h) | 32.96 mph (53.05 km/h) |
| 35 mph (56.33 km/h) | 38.46 mph (61.89 km/h) |
| 40 mph (64.37 km/h) | 43.95 mph (70.73 km/h) |
| 45 mph (72.42 km/h) | 49.44 mph (79.57 km/h) |
| 50 mph (80.47 km/h) | 54.94 mph (88.41 km/h) |
| 55 mph (88.51 km/h) | 60.43 mph (97.25 km/h) |
| 60 mph (96.56 km/h) | 65.92 mph (106.09 km/h) |
| 65 mph (104.61 km/h) | 71.42 mph (114.94 km/h) |
| 70 mph (112.65 km/h) | 76.91 mph (123.78 km/h) |
| 75 mph (120.7 km/h) | 82.41 mph (132.62 km/h) |
| 80 mph (128.75 km/h) | 87.9 mph (141.46 km/h) |
| 85 mph (136.79 km/h) | 93.39 mph (150.3 km/h) |
| 90 mph (144.84 km/h) | 98.89 mph (159.14 km/h) |
| 95 mph (152.89 km/h) | 104.38 mph (167.98 km/h) |
| 100 mph (160.93 km/h) | 109.87 mph (176.82 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1924 | 2235 | 2407 | 2513 | 2628 | 2709 | 2799 | 2906 | 3053 | 3201 | 3364 | 3495 | 3733 | 3995 | 4199 | 4330 | 4404 | 4674 | 5050 | 5869 |
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