Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/70-18 | 125/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.54 (674.2) | 25.87 (657.2) | -0.67 (-17) -2.5% |
| Width inches (mm) | 6.1 (155) | 4.92 (125) | -1.18 (-30) -19.4% |
| Circum. inches (mm) | 83.39 (2118.06) | 81.29 (2064.65) | -2.1 (-53.41) -2.5% |
| Sidewall Height inches (mm) | 4.27 (108.5) | 3.94 (100) | -0.33 (-8.5) -7.8% |
| Revolutions per mile (km) | 759.82 (472.13) | 779.47 (484.34) | 19.65 (12.21) 2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.5 mph (31.38 km/h) |
| 25 mph (40.23 km/h) | 24.37 mph (39.22 km/h) |
| 30 mph (48.28 km/h) | 29.24 mph (47.06 km/h) |
| 35 mph (56.33 km/h) | 34.12 mph (54.91 km/h) |
| 40 mph (64.37 km/h) | 38.99 mph (62.75 km/h) |
| 45 mph (72.42 km/h) | 43.87 mph (70.59 km/h) |
| 50 mph (80.47 km/h) | 48.74 mph (78.44 km/h) |
| 55 mph (88.51 km/h) | 53.61 mph (86.28 km/h) |
| 60 mph (96.56 km/h) | 58.49 mph (94.13 km/h) |
| 65 mph (104.61 km/h) | 63.36 mph (101.97 km/h) |
| 70 mph (112.65 km/h) | 68.23 mph (109.81 km/h) |
| 75 mph (120.7 km/h) | 73.11 mph (117.66 km/h) |
| 80 mph (128.75 km/h) | 77.98 mph (125.5 km/h) |
| 85 mph (136.79 km/h) | 82.86 mph (133.35 km/h) |
| 90 mph (144.84 km/h) | 87.73 mph (141.19 km/h) |
| 95 mph (152.89 km/h) | 92.6 mph (149.03 km/h) |
| 100 mph (160.93 km/h) | 97.48 mph (156.88 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1984 | 2304 | 2482 | 2591 | 2710 | 2794 | 2887 | 2997 | 3148 | 3300 | 3469 | 3604 | 3849 | 4119 | 4330 | 4465 | 4541 | 4820 | 5208 | 6052 |
Better Fuel Economy Factory Ratios Increased Power
