Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 170/80-15 | 190/70-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.71 (653) | 25.47 (647) | -0.24 (-6) -0.9% |
| Width inches (mm) | 6.69 (170) | 7.48 (190) | 0.79 (20) 11.8% |
| Circum. inches (mm) | 80.77 (2051.46) | 80.02 (2032.61) | -0.74 (-18.85) -0.9% |
| Sidewall Height inches (mm) | 5.35 (136) | 5.24 (133) | -0.12 (-3) -2.2% |
| Revolutions per mile (km) | 784.49 (487.46) | 791.76 (491.98) | 7.27 (4.52) 0.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.82 mph (31.89 km/h) |
| 25 mph (40.23 km/h) | 24.77 mph (39.86 km/h) |
| 30 mph (48.28 km/h) | 29.72 mph (47.84 km/h) |
| 35 mph (56.33 km/h) | 34.68 mph (55.81 km/h) |
| 40 mph (64.37 km/h) | 39.63 mph (63.78 km/h) |
| 45 mph (72.42 km/h) | 44.59 mph (71.76 km/h) |
| 50 mph (80.47 km/h) | 49.54 mph (79.73 km/h) |
| 55 mph (88.51 km/h) | 54.49 mph (87.7 km/h) |
| 60 mph (96.56 km/h) | 59.45 mph (95.67 km/h) |
| 65 mph (104.61 km/h) | 64.4 mph (103.65 km/h) |
| 70 mph (112.65 km/h) | 69.36 mph (111.62 km/h) |
| 75 mph (120.7 km/h) | 74.31 mph (119.59 km/h) |
| 80 mph (128.75 km/h) | 79.26 mph (127.56 km/h) |
| 85 mph (136.79 km/h) | 84.22 mph (135.54 km/h) |
| 90 mph (144.84 km/h) | 89.17 mph (143.51 km/h) |
| 95 mph (152.89 km/h) | 94.13 mph (151.48 km/h) |
| 100 mph (160.93 km/h) | 99.08 mph (159.46 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2015 | 2341 | 2521 | 2632 | 2752 | 2838 | 2932 | 3044 | 3198 | 3352 | 3524 | 3661 | 3910 | 4184 | 4398 | 4536 | 4613 | 4896 | 5290 | 6148 |
Better Fuel Economy Factory Ratios Increased Power
