Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/60-18 | 255/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.1 (739.2) | 31.04 (788.5) | 1.94 (49.3) 6.7% |
| Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
| Circum. inches (mm) | 91.43 (2322.27) | 97.53 (2477.15) | 6.1 (154.88) 6.7% |
| Sidewall Height inches (mm) | 5.55 (141) | 5.52 (140.25) | -0.03 (-0.75) -0.5% |
| Revolutions per mile (km) | 693.01 (430.61) | 649.68 (403.69) | -43.33 (-26.92) -6.3% |
255/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.33 mph (34.33 km/h) |
| 25 mph (40.23 km/h) | 26.67 mph (42.92 km/h) |
| 30 mph (48.28 km/h) | 32 mph (51.5 km/h) |
| 35 mph (56.33 km/h) | 37.33 mph (60.08 km/h) |
| 40 mph (64.37 km/h) | 42.67 mph (68.67 km/h) |
| 45 mph (72.42 km/h) | 48 mph (77.25 km/h) |
| 50 mph (80.47 km/h) | 53.33 mph (85.83 km/h) |
| 55 mph (88.51 km/h) | 58.67 mph (94.42 km/h) |
| 60 mph (96.56 km/h) | 64 mph (103 km/h) |
| 65 mph (104.61 km/h) | 69.34 mph (111.58 km/h) |
| 70 mph (112.65 km/h) | 74.67 mph (120.17 km/h) |
| 75 mph (120.7 km/h) | 80 mph (128.75 km/h) |
| 80 mph (128.75 km/h) | 85.34 mph (137.33 km/h) |
| 85 mph (136.79 km/h) | 90.67 mph (145.92 km/h) |
| 90 mph (144.84 km/h) | 96 mph (154.5 km/h) |
| 95 mph (152.89 km/h) | 101.34 mph (163.08 km/h) |
| 100 mph (160.93 km/h) | 106.67 mph (171.67 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1653 | 1921 | 2068 | 2160 | 2258 | 2329 | 2406 | 2498 | 2624 | 2751 | 2892 | 3004 | 3208 | 3433 | 3609 | 3722 | 3785 | 4017 | 4341 | 5044 |
Better Fuel Economy Factory Ratios Increased Power
