Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-12 | 25/8-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 20.5 (520.8) | 24.95 (633.66) | 4.44 (112.86) 21.7% |
| Width inches (mm) | 5.31 (135) | 7.99 (203) | 2.68 (68) 50.4% |
| Circum. inches (mm) | 64.42 (1636.14) | 78.37 (1990.7) | 13.96 (354.56) 21.7% |
| Sidewall Height inches (mm) | 4.25 (108) | 6.47 (164.43) | 2.22 (56.43) 52.3% |
| Revolutions per mile (km) | 983.62 (611.19) | 808.43 (502.33) | -175.19 (-108.86) -17.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.33 mph (39.16 km/h) |
| 25 mph (40.23 km/h) | 30.42 mph (48.95 km/h) |
| 30 mph (48.28 km/h) | 36.5 mph (58.74 km/h) |
| 35 mph (56.33 km/h) | 42.58 mph (68.53 km/h) |
| 40 mph (64.37 km/h) | 48.67 mph (78.32 km/h) |
| 45 mph (72.42 km/h) | 54.75 mph (88.11 km/h) |
| 50 mph (80.47 km/h) | 60.84 mph (97.91 km/h) |
| 55 mph (88.51 km/h) | 66.92 mph (107.7 km/h) |
| 60 mph (96.56 km/h) | 73 mph (117.49 km/h) |
| 65 mph (104.61 km/h) | 79.09 mph (127.28 km/h) |
| 70 mph (112.65 km/h) | 85.17 mph (137.07 km/h) |
| 75 mph (120.7 km/h) | 91.25 mph (146.86 km/h) |
| 80 mph (128.75 km/h) | 97.34 mph (156.65 km/h) |
| 85 mph (136.79 km/h) | 103.42 mph (166.44 km/h) |
| 90 mph (144.84 km/h) | 109.5 mph (176.23 km/h) |
| 95 mph (152.89 km/h) | 115.59 mph (186.02 km/h) |
| 100 mph (160.93 km/h) | 121.67 mph (195.81 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2057 | 2390 | 2574 | 2688 | 2810 | 2898 | 2994 | 3108 | 3265 | 3423 | 3598 | 3738 | 3992 | 4272 | 4491 | 4631 | 4710 | 4999 | 5402 | 6277 |
Better Fuel Economy Factory Ratios Increased Power
