Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/80-15 | 31/8-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.17 (741) | 30.98 (787) | 1.81 (46) 6.2% |
| Width inches (mm) | 8.86 (225) | 7.99 (203) | -0.87 (-22) -9.8% |
| Circum. inches (mm) | 91.65 (2327.92) | 97.34 (2472.43) | 5.69 (144.51) 6.2% |
| Sidewall Height inches (mm) | 7.09 (180) | 7.99 (203) | 0.91 (23) 12.8% |
| Revolutions per mile (km) | 691.32 (429.57) | 650.92 (404.46) | -40.41 (-25.11) -5.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.24 mph (34.19 km/h) |
| 25 mph (40.23 km/h) | 26.55 mph (42.73 km/h) |
| 30 mph (48.28 km/h) | 31.86 mph (51.28 km/h) |
| 35 mph (56.33 km/h) | 37.17 mph (59.82 km/h) |
| 40 mph (64.37 km/h) | 42.48 mph (68.37 km/h) |
| 45 mph (72.42 km/h) | 47.79 mph (76.92 km/h) |
| 50 mph (80.47 km/h) | 53.1 mph (85.46 km/h) |
| 55 mph (88.51 km/h) | 58.41 mph (94.01 km/h) |
| 60 mph (96.56 km/h) | 63.72 mph (102.56 km/h) |
| 65 mph (104.61 km/h) | 69.04 mph (111.1 km/h) |
| 70 mph (112.65 km/h) | 74.35 mph (119.65 km/h) |
| 75 mph (120.7 km/h) | 79.66 mph (128.19 km/h) |
| 80 mph (128.75 km/h) | 84.97 mph (136.74 km/h) |
| 85 mph (136.79 km/h) | 90.28 mph (145.29 km/h) |
| 90 mph (144.84 km/h) | 95.59 mph (153.83 km/h) |
| 95 mph (152.89 km/h) | 100.9 mph (162.38 km/h) |
| 100 mph (160.93 km/h) | 106.21 mph (170.93 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1656 | 1924 | 2072 | 2164 | 2263 | 2333 | 2411 | 2502 | 2629 | 2756 | 2897 | 3010 | 3214 | 3440 | 3616 | 3729 | 3792 | 4025 | 4349 | 5054 |
Better Fuel Economy Factory Ratios Increased Power
