Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/50-18 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.25 (692.2) | 26.68 (677.7) | -0.57 (-14.5) -2.1% |
| Width inches (mm) | 9.25 (235) | 9.65 (245) | 0.39 (10) 4.3% |
| Circum. inches (mm) | 85.61 (2174.61) | 83.82 (2129.06) | -1.79 (-45.55) -2.1% |
| Sidewall Height inches (mm) | 4.63 (117.5) | 4.34 (110.25) | -0.29 (-7.25) -6.2% |
| Revolutions per mile (km) | 740.06 (459.85) | 755.9 (469.69) | 15.83 (9.84) 2.1% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.58 mph (31.51 km/h) |
| 25 mph (40.23 km/h) | 24.48 mph (39.39 km/h) |
| 30 mph (48.28 km/h) | 29.37 mph (47.27 km/h) |
| 35 mph (56.33 km/h) | 34.27 mph (55.15 km/h) |
| 40 mph (64.37 km/h) | 39.16 mph (63.03 km/h) |
| 45 mph (72.42 km/h) | 44.06 mph (70.9 km/h) |
| 50 mph (80.47 km/h) | 48.95 mph (78.78 km/h) |
| 55 mph (88.51 km/h) | 53.85 mph (86.66 km/h) |
| 60 mph (96.56 km/h) | 58.74 mph (94.54 km/h) |
| 65 mph (104.61 km/h) | 63.64 mph (102.42 km/h) |
| 70 mph (112.65 km/h) | 68.53 mph (110.29 km/h) |
| 75 mph (120.7 km/h) | 73.43 mph (118.17 km/h) |
| 80 mph (128.75 km/h) | 78.32 mph (126.05 km/h) |
| 85 mph (136.79 km/h) | 83.22 mph (133.93 km/h) |
| 90 mph (144.84 km/h) | 88.11 mph (141.81 km/h) |
| 95 mph (152.89 km/h) | 93.01 mph (149.69 km/h) |
| 100 mph (160.93 km/h) | 97.91 mph (157.56 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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