Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-15 | 185/80-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.13 (613) | 26.65 (677) | 2.52 (64) 10.4% |
| Width inches (mm) | 5.71 (145) | 7.28 (185) | 1.57 (40) 27.6% |
| Circum. inches (mm) | 75.82 (1925.8) | 83.73 (2126.86) | 7.92 (201.06) 10.4% |
| Sidewall Height inches (mm) | 4.57 (116) | 5.83 (148) | 1.26 (32) 27.6% |
| Revolutions per mile (km) | 835.68 (519.26) | 756.68 (470.18) | -79 (-49.09) -9.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.09 mph (35.55 km/h) |
| 25 mph (40.23 km/h) | 27.61 mph (44.43 km/h) |
| 30 mph (48.28 km/h) | 33.13 mph (53.32 km/h) |
| 35 mph (56.33 km/h) | 38.65 mph (62.21 km/h) |
| 40 mph (64.37 km/h) | 44.18 mph (71.09 km/h) |
| 45 mph (72.42 km/h) | 49.7 mph (79.98 km/h) |
| 50 mph (80.47 km/h) | 55.22 mph (88.87 km/h) |
| 55 mph (88.51 km/h) | 60.74 mph (97.76 km/h) |
| 60 mph (96.56 km/h) | 66.26 mph (106.64 km/h) |
| 65 mph (104.61 km/h) | 71.79 mph (115.53 km/h) |
| 70 mph (112.65 km/h) | 77.31 mph (124.42 km/h) |
| 75 mph (120.7 km/h) | 82.83 mph (133.3 km/h) |
| 80 mph (128.75 km/h) | 88.35 mph (142.19 km/h) |
| 85 mph (136.79 km/h) | 93.87 mph (151.08 km/h) |
| 90 mph (144.84 km/h) | 99.4 mph (159.96 km/h) |
| 95 mph (152.89 km/h) | 104.92 mph (168.85 km/h) |
| 100 mph (160.93 km/h) | 110.44 mph (177.74 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1926 | 2237 | 2409 | 2516 | 2630 | 2712 | 2802 | 2909 | 3056 | 3204 | 3368 | 3499 | 3736 | 3999 | 4204 | 4335 | 4408 | 4679 | 5056 | 5875 |
Better Fuel Economy Factory Ratios Increased Power
