Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/90-17 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.57 (674.8) | 28.18 (715.7) | 1.61 (40.9) 6.1% |
| Width inches (mm) | 5.31 (135) | 9.25 (235) | 3.94 (100) 74.1% |
| Circum. inches (mm) | 83.46 (2119.95) | 88.52 (2248.44) | 5.06 (128.49) 6.1% |
| Sidewall Height inches (mm) | 4.78 (121.5) | 5.09 (129.25) | 0.31 (7.75) 6.4% |
| Revolutions per mile (km) | 759.14 (471.71) | 715.76 (444.75) | -43.38 (-26.96) -5.7% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.21 mph (34.14 km/h) |
| 25 mph (40.23 km/h) | 26.52 mph (42.67 km/h) |
| 30 mph (48.28 km/h) | 31.82 mph (51.21 km/h) |
| 35 mph (56.33 km/h) | 37.12 mph (59.74 km/h) |
| 40 mph (64.37 km/h) | 42.42 mph (68.28 km/h) |
| 45 mph (72.42 km/h) | 47.73 mph (76.81 km/h) |
| 50 mph (80.47 km/h) | 53.03 mph (85.34 km/h) |
| 55 mph (88.51 km/h) | 58.33 mph (93.88 km/h) |
| 60 mph (96.56 km/h) | 63.64 mph (102.41 km/h) |
| 65 mph (104.61 km/h) | 68.94 mph (110.95 km/h) |
| 70 mph (112.65 km/h) | 74.24 mph (119.48 km/h) |
| 75 mph (120.7 km/h) | 79.55 mph (128.02 km/h) |
| 80 mph (128.75 km/h) | 84.85 mph (136.55 km/h) |
| 85 mph (136.79 km/h) | 90.15 mph (145.09 km/h) |
| 90 mph (144.84 km/h) | 95.45 mph (153.62 km/h) |
| 95 mph (152.89 km/h) | 100.76 mph (162.15 km/h) |
| 100 mph (160.93 km/h) | 106.06 mph (170.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1821 | 2116 | 2279 | 2380 | 2488 | 2566 | 2651 | 2752 | 2891 | 3031 | 3186 | 3310 | 3534 | 3782 | 3976 | 4100 | 4170 | 4426 | 4782 | 5557 |
Better Fuel Economy Factory Ratios Increased Power
