Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/90-15 | 420/85-30 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.57 (624) | 58.11 (1476) | 33.54 (852) 136.5% |
| Width inches (mm) | 5.31 (135) | 16.54 (420) | 11.22 (285) 211.1% |
| Circum. inches (mm) | 77.18 (1960.35) | 182.56 (4636.99) | 105.38 (2676.64) 136.5% |
| Sidewall Height inches (mm) | 4.78 (121.5) | 14.06 (357) | 9.27 (235.5) 193.8% |
| Revolutions per mile (km) | 820.95 (510.11) | 347.07 (215.66) | -473.88 (-294.45) -57.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 47.31 mph (76.13 km/h) |
| 25 mph (40.23 km/h) | 59.13 mph (95.17 km/h) |
| 30 mph (48.28 km/h) | 70.96 mph (114.2 km/h) |
| 35 mph (56.33 km/h) | 82.79 mph (133.24 km/h) |
| 40 mph (64.37 km/h) | 94.62 mph (152.27 km/h) |
| 45 mph (72.42 km/h) | 106.44 mph (171.3 km/h) |
| 50 mph (80.47 km/h) | 118.27 mph (190.34 km/h) |
| 55 mph (88.51 km/h) | 130.1 mph (209.37 km/h) |
| 60 mph (96.56 km/h) | 141.92 mph (228.4 km/h) |
| 65 mph (104.61 km/h) | 153.75 mph (247.44 km/h) |
| 70 mph (112.65 km/h) | 165.58 mph (266.47 km/h) |
| 75 mph (120.7 km/h) | 177.4 mph (285.5 km/h) |
| 80 mph (128.75 km/h) | 189.23 mph (304.54 km/h) |
| 85 mph (136.79 km/h) | 201.06 mph (323.57 km/h) |
| 90 mph (144.84 km/h) | 212.88 mph (342.61 km/h) |
| 95 mph (152.89 km/h) | 224.71 mph (361.64 km/h) |
| 100 mph (160.93 km/h) | 236.54 mph (380.67 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
