Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-17 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.33 (643.3) | 26.68 (677.7) | 1.35 (34.4) 5.3% |
| Width inches (mm) | 9.25 (235) | 9.65 (245) | 0.39 (10) 4.3% |
| Circum. inches (mm) | 79.57 (2020.99) | 83.82 (2129.06) | 4.25 (108.07) 5.3% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 4.34 (110.25) | 0.18 (4.5) 4.3% |
| Revolutions per mile (km) | 796.32 (494.81) | 755.9 (469.69) | -40.42 (-25.12) -5.1% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.07 mph (33.91 km/h) |
| 25 mph (40.23 km/h) | 26.34 mph (42.39 km/h) |
| 30 mph (48.28 km/h) | 31.6 mph (50.86 km/h) |
| 35 mph (56.33 km/h) | 36.87 mph (59.34 km/h) |
| 40 mph (64.37 km/h) | 42.14 mph (67.82 km/h) |
| 45 mph (72.42 km/h) | 47.41 mph (76.29 km/h) |
| 50 mph (80.47 km/h) | 52.67 mph (84.77 km/h) |
| 55 mph (88.51 km/h) | 57.94 mph (93.25 km/h) |
| 60 mph (96.56 km/h) | 63.21 mph (101.72 km/h) |
| 65 mph (104.61 km/h) | 68.48 mph (110.2 km/h) |
| 70 mph (112.65 km/h) | 73.74 mph (118.68 km/h) |
| 75 mph (120.7 km/h) | 79.01 mph (127.16 km/h) |
| 80 mph (128.75 km/h) | 84.28 mph (135.63 km/h) |
| 85 mph (136.79 km/h) | 89.55 mph (144.11 km/h) |
| 90 mph (144.84 km/h) | 94.81 mph (152.59 km/h) |
| 95 mph (152.89 km/h) | 100.08 mph (161.06 km/h) |
| 100 mph (160.93 km/h) | 105.35 mph (169.54 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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