Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/55-20 | 235/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.18 (766.5) | 29.1 (739.2) | -1.07 (-27.3) -3.6% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 94.8 (2408.03) | 91.43 (2322.27) | -3.38 (-85.77) -3.6% |
| Sidewall Height inches (mm) | 5.09 (129.25) | 5.55 (141) | 0.46 (11.75) 9.1% |
| Revolutions per mile (km) | 668.32 (415.28) | 693.01 (430.61) | 24.68 (15.34) 3.7% |
235/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.29 mph (31.04 km/h) |
| 25 mph (40.23 km/h) | 24.11 mph (38.8 km/h) |
| 30 mph (48.28 km/h) | 28.93 mph (46.56 km/h) |
| 35 mph (56.33 km/h) | 33.75 mph (54.32 km/h) |
| 40 mph (64.37 km/h) | 38.58 mph (62.08 km/h) |
| 45 mph (72.42 km/h) | 43.4 mph (69.84 km/h) |
| 50 mph (80.47 km/h) | 48.22 mph (77.6 km/h) |
| 55 mph (88.51 km/h) | 53.04 mph (85.36 km/h) |
| 60 mph (96.56 km/h) | 57.86 mph (93.12 km/h) |
| 65 mph (104.61 km/h) | 62.68 mph (100.88 km/h) |
| 70 mph (112.65 km/h) | 67.51 mph (108.64 km/h) |
| 75 mph (120.7 km/h) | 72.33 mph (116.4 km/h) |
| 80 mph (128.75 km/h) | 77.15 mph (124.16 km/h) |
| 85 mph (136.79 km/h) | 81.97 mph (131.92 km/h) |
| 90 mph (144.84 km/h) | 86.79 mph (139.68 km/h) |
| 95 mph (152.89 km/h) | 91.62 mph (147.44 km/h) |
| 100 mph (160.93 km/h) | 96.44 mph (155.2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1764 | 2049 | 2206 | 2304 | 2409 | 2484 | 2567 | 2664 | 2799 | 2934 | 3084 | 3204 | 3422 | 3662 | 3850 | 3970 | 4037 | 4285 | 4630 | 5381 |
Better Fuel Economy Factory Ratios Increased Power
