Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 125/70-17 | 235/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.89 (606.8) | 26.33 (668.7) | 2.44 (61.9) 10.2% |
| Width inches (mm) | 4.92 (125) | 9.25 (235) | 4.33 (110) 88% |
| Circum. inches (mm) | 75.05 (1906.32) | 82.71 (2100.78) | 7.66 (194.46) 10.2% |
| Sidewall Height inches (mm) | 3.44 (87.5) | 4.16 (105.75) | 0.72 (18.25) 20.9% |
| Revolutions per mile (km) | 844.22 (524.57) | 766.07 (476.01) | -78.15 (-48.56) -9.3% |
235/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.04 mph (35.47 km/h) |
| 25 mph (40.23 km/h) | 27.55 mph (44.34 km/h) |
| 30 mph (48.28 km/h) | 33.06 mph (53.21 km/h) |
| 35 mph (56.33 km/h) | 38.57 mph (62.07 km/h) |
| 40 mph (64.37 km/h) | 44.08 mph (70.94 km/h) |
| 45 mph (72.42 km/h) | 49.59 mph (79.81 km/h) |
| 50 mph (80.47 km/h) | 55.1 mph (88.68 km/h) |
| 55 mph (88.51 km/h) | 60.61 mph (97.54 km/h) |
| 60 mph (96.56 km/h) | 66.12 mph (106.41 km/h) |
| 65 mph (104.61 km/h) | 71.63 mph (115.28 km/h) |
| 70 mph (112.65 km/h) | 77.14 mph (124.15 km/h) |
| 75 mph (120.7 km/h) | 82.65 mph (133.01 km/h) |
| 80 mph (128.75 km/h) | 88.16 mph (141.88 km/h) |
| 85 mph (136.79 km/h) | 93.67 mph (150.75 km/h) |
| 90 mph (144.84 km/h) | 99.18 mph (159.62 km/h) |
| 95 mph (152.89 km/h) | 104.69 mph (168.48 km/h) |
| 100 mph (160.93 km/h) | 110.2 mph (177.35 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1949 | 2265 | 2439 | 2547 | 2663 | 2746 | 2837 | 2945 | 3094 | 3244 | 3410 | 3542 | 3783 | 4048 | 4256 | 4388 | 4463 | 4737 | 5118 | 5948 |
Better Fuel Economy Factory Ratios Increased Power
