Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/80-17 | 255/85-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.8 (807.8) | 34.07 (865.3) | 2.26 (57.5) 7.1% |
| Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
| Circum. inches (mm) | 99.91 (2537.78) | 107.02 (2718.42) | 7.11 (180.64) 7.1% |
| Sidewall Height inches (mm) | 7.4 (188) | 8.53 (216.75) | 1.13 (28.75) 15.3% |
| Revolutions per mile (km) | 634.15 (394.04) | 592.01 (367.86) | -42.14 (-26.18) -6.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.42 mph (34.48 km/h) |
| 25 mph (40.23 km/h) | 26.78 mph (43.1 km/h) |
| 30 mph (48.28 km/h) | 32.14 mph (51.72 km/h) |
| 35 mph (56.33 km/h) | 37.49 mph (60.34 km/h) |
| 40 mph (64.37 km/h) | 42.85 mph (68.96 km/h) |
| 45 mph (72.42 km/h) | 48.2 mph (77.58 km/h) |
| 50 mph (80.47 km/h) | 53.56 mph (86.2 km/h) |
| 55 mph (88.51 km/h) | 58.91 mph (94.81 km/h) |
| 60 mph (96.56 km/h) | 64.27 mph (103.43 km/h) |
| 65 mph (104.61 km/h) | 69.63 mph (112.05 km/h) |
| 70 mph (112.65 km/h) | 74.98 mph (120.67 km/h) |
| 75 mph (120.7 km/h) | 80.34 mph (129.29 km/h) |
| 80 mph (128.75 km/h) | 85.69 mph (137.91 km/h) |
| 85 mph (136.79 km/h) | 91.05 mph (146.53 km/h) |
| 90 mph (144.84 km/h) | 96.41 mph (155.15 km/h) |
| 95 mph (152.89 km/h) | 101.76 mph (163.77 km/h) |
| 100 mph (160.93 km/h) | 107.12 mph (172.39 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1507 | 1750 | 1885 | 1968 | 2058 | 2122 | 2193 | 2276 | 2391 | 2507 | 2635 | 2737 | 2923 | 3129 | 3289 | 3391 | 3449 | 3661 | 3956 | 4597 |
Better Fuel Economy Factory Ratios Increased Power
