Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-15 | 230/60-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.92 (633) | 25.87 (657) | 0.94 (24) 3.8% |
| Width inches (mm) | 7.09 (180) | 9.06 (230) | 1.97 (50) 27.8% |
| Circum. inches (mm) | 78.29 (1988.63) | 81.26 (2064.03) | 2.97 (75.4) 3.8% |
| Sidewall Height inches (mm) | 4.96 (126) | 5.43 (138) | 0.47 (12) 9.5% |
| Revolutions per mile (km) | 809.27 (502.86) | 779.71 (484.49) | -29.56 (-18.37) -3.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.76 mph (33.41 km/h) |
| 25 mph (40.23 km/h) | 25.95 mph (41.76 km/h) |
| 30 mph (48.28 km/h) | 31.14 mph (50.11 km/h) |
| 35 mph (56.33 km/h) | 36.33 mph (58.46 km/h) |
| 40 mph (64.37 km/h) | 41.52 mph (66.81 km/h) |
| 45 mph (72.42 km/h) | 46.71 mph (75.17 km/h) |
| 50 mph (80.47 km/h) | 51.9 mph (83.52 km/h) |
| 55 mph (88.51 km/h) | 57.09 mph (91.87 km/h) |
| 60 mph (96.56 km/h) | 62.27 mph (100.22 km/h) |
| 65 mph (104.61 km/h) | 67.46 mph (108.57 km/h) |
| 70 mph (112.65 km/h) | 72.65 mph (116.93 km/h) |
| 75 mph (120.7 km/h) | 77.84 mph (125.28 km/h) |
| 80 mph (128.75 km/h) | 83.03 mph (133.63 km/h) |
| 85 mph (136.79 km/h) | 88.22 mph (141.98 km/h) |
| 90 mph (144.84 km/h) | 93.41 mph (150.33 km/h) |
| 95 mph (152.89 km/h) | 98.6 mph (158.68 km/h) |
| 100 mph (160.93 km/h) | 103.79 mph (167.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1984 | 2305 | 2482 | 2592 | 2710 | 2795 | 2888 | 2997 | 3149 | 3301 | 3470 | 3605 | 3850 | 4120 | 4332 | 4467 | 4543 | 4821 | 5210 | 6054 |
Better Fuel Economy Factory Ratios Increased Power
