Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/70-18 | 155/75-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.54 (674.2) | 29.15 (740.5) | 2.61 (66.3) 9.8% |
| Width inches (mm) | 6.1 (155) | 6.1 (155) | 0 (0) 0% |
| Circum. inches (mm) | 83.39 (2118.06) | 91.59 (2326.35) | 8.2 (208.29) 9.8% |
| Sidewall Height inches (mm) | 4.27 (108.5) | 4.58 (116.25) | 0.31 (7.75) 7.1% |
| Revolutions per mile (km) | 759.82 (472.13) | 691.79 (429.86) | -68.03 (-42.27) -9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.97 mph (35.35 km/h) |
| 25 mph (40.23 km/h) | 27.46 mph (44.19 km/h) |
| 30 mph (48.28 km/h) | 32.95 mph (53.03 km/h) |
| 35 mph (56.33 km/h) | 38.44 mph (61.87 km/h) |
| 40 mph (64.37 km/h) | 43.93 mph (70.7 km/h) |
| 45 mph (72.42 km/h) | 49.43 mph (79.54 km/h) |
| 50 mph (80.47 km/h) | 54.92 mph (88.38 km/h) |
| 55 mph (88.51 km/h) | 60.41 mph (97.22 km/h) |
| 60 mph (96.56 km/h) | 65.9 mph (106.06 km/h) |
| 65 mph (104.61 km/h) | 71.39 mph (114.89 km/h) |
| 70 mph (112.65 km/h) | 76.88 mph (123.73 km/h) |
| 75 mph (120.7 km/h) | 82.38 mph (132.57 km/h) |
| 80 mph (128.75 km/h) | 87.87 mph (141.41 km/h) |
| 85 mph (136.79 km/h) | 93.36 mph (150.25 km/h) |
| 90 mph (144.84 km/h) | 98.85 mph (159.08 km/h) |
| 95 mph (152.89 km/h) | 104.34 mph (167.92 km/h) |
| 100 mph (160.93 km/h) | 109.83 mph (176.76 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1760 | 2045 | 2202 | 2300 | 2405 | 2480 | 2562 | 2659 | 2794 | 2929 | 3079 | 3199 | 3416 | 3656 | 3843 | 3963 | 4030 | 4278 | 4622 | 5371 |
Better Fuel Economy Factory Ratios Increased Power
