Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/85-18 | 125/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.7 (703.7) | 25.38 (644.7) | -2.32 (-59) -8.4% |
| Width inches (mm) | 5.71 (145) | 4.92 (125) | -0.79 (-20) -13.8% |
| Circum. inches (mm) | 87.04 (2210.74) | 79.74 (2025.38) | -7.3 (-185.35) -8.4% |
| Sidewall Height inches (mm) | 4.85 (123.25) | 3.69 (93.75) | -1.16 (-29.5) -23.9% |
| Revolutions per mile (km) | 727.97 (452.34) | 794.59 (493.73) | 66.62 (41.4) 9.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.32 mph (29.49 km/h) |
| 25 mph (40.23 km/h) | 22.9 mph (36.86 km/h) |
| 30 mph (48.28 km/h) | 27.48 mph (44.23 km/h) |
| 35 mph (56.33 km/h) | 32.07 mph (51.6 km/h) |
| 40 mph (64.37 km/h) | 36.65 mph (58.98 km/h) |
| 45 mph (72.42 km/h) | 41.23 mph (66.35 km/h) |
| 50 mph (80.47 km/h) | 45.81 mph (73.72 km/h) |
| 55 mph (88.51 km/h) | 50.39 mph (81.09 km/h) |
| 60 mph (96.56 km/h) | 54.97 mph (88.46 km/h) |
| 65 mph (104.61 km/h) | 59.55 mph (95.84 km/h) |
| 70 mph (112.65 km/h) | 64.13 mph (103.21 km/h) |
| 75 mph (120.7 km/h) | 68.71 mph (110.58 km/h) |
| 80 mph (128.75 km/h) | 73.29 mph (117.95 km/h) |
| 85 mph (136.79 km/h) | 77.87 mph (125.33 km/h) |
| 90 mph (144.84 km/h) | 82.45 mph (132.7 km/h) |
| 95 mph (152.89 km/h) | 87.03 mph (140.07 km/h) |
| 100 mph (160.93 km/h) | 91.62 mph (147.44 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022 | 2349 | 2530 | 2642 | 2762 | 2848 | 2943 | 3055 | 3210 | 3364 | 3536 | 3674 | 3924 | 4199 | 4414 | 4552 | 4629 | 4913 | 5309 | 6169 |
Better Fuel Economy Factory Ratios Increased Power
