Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/55-15 | 145/70-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.71 (551.5) | 19.99 (507.8) | -1.72 (-43.7) -7.9% |
| Width inches (mm) | 6.1 (155) | 5.71 (145) | -0.39 (-10) -6.5% |
| Circum. inches (mm) | 68.21 (1732.59) | 62.81 (1595.3) | -5.41 (-137.29) -7.9% |
| Sidewall Height inches (mm) | 3.36 (85.25) | 4 (101.5) | 0.64 (16.25) 19.1% |
| Revolutions per mile (km) | 928.87 (577.17) | 1008.8 (626.84) | 79.94 (49.67) 8.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.42 mph (29.64 km/h) |
| 25 mph (40.23 km/h) | 23.02 mph (37.05 km/h) |
| 30 mph (48.28 km/h) | 27.62 mph (44.45 km/h) |
| 35 mph (56.33 km/h) | 32.23 mph (51.86 km/h) |
| 40 mph (64.37 km/h) | 36.83 mph (59.27 km/h) |
| 45 mph (72.42 km/h) | 41.43 mph (66.68 km/h) |
| 50 mph (80.47 km/h) | 46.04 mph (74.09 km/h) |
| 55 mph (88.51 km/h) | 50.64 mph (81.5 km/h) |
| 60 mph (96.56 km/h) | 55.25 mph (88.91 km/h) |
| 65 mph (104.61 km/h) | 59.85 mph (96.32 km/h) |
| 70 mph (112.65 km/h) | 64.45 mph (103.73 km/h) |
| 75 mph (120.7 km/h) | 69.06 mph (111.14 km/h) |
| 80 mph (128.75 km/h) | 73.66 mph (118.55 km/h) |
| 85 mph (136.79 km/h) | 78.26 mph (125.96 km/h) |
| 90 mph (144.84 km/h) | 82.87 mph (133.36 km/h) |
| 95 mph (152.89 km/h) | 87.47 mph (140.77 km/h) |
| 100 mph (160.93 km/h) | 92.08 mph (148.18 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
