Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/60-15 | 30/17.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.85 (555) | 30.07 (763.7) | 8.22 (208.7) 37.6% |
| Width inches (mm) | 5.71 (145) | 17.52 (445) | 11.81 (300) 206.9% |
| Circum. inches (mm) | 68.65 (1743.58) | 94.46 (2399.23) | 25.81 (655.65) 37.6% |
| Sidewall Height inches (mm) | 3.43 (87) | 7.53 (191.35) | 4.11 (104.35) 119.9% |
| Revolutions per mile (km) | 923.01 (573.53) | 670.77 (416.8) | -252.24 (-156.73) -27.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.52 mph (44.29 km/h) |
| 25 mph (40.23 km/h) | 34.4 mph (55.36 km/h) |
| 30 mph (48.28 km/h) | 41.28 mph (66.44 km/h) |
| 35 mph (56.33 km/h) | 48.16 mph (77.51 km/h) |
| 40 mph (64.37 km/h) | 55.04 mph (88.58 km/h) |
| 45 mph (72.42 km/h) | 61.92 mph (99.65 km/h) |
| 50 mph (80.47 km/h) | 68.8 mph (110.73 km/h) |
| 55 mph (88.51 km/h) | 75.68 mph (121.8 km/h) |
| 60 mph (96.56 km/h) | 82.56 mph (132.87 km/h) |
| 65 mph (104.61 km/h) | 89.44 mph (143.94 km/h) |
| 70 mph (112.65 km/h) | 96.32 mph (155.02 km/h) |
| 75 mph (120.7 km/h) | 103.2 mph (166.09 km/h) |
| 80 mph (128.75 km/h) | 110.08 mph (177.16 km/h) |
| 85 mph (136.79 km/h) | 116.96 mph (188.23 km/h) |
| 90 mph (144.84 km/h) | 123.84 mph (199.31 km/h) |
| 95 mph (152.89 km/h) | 130.72 mph (210.38 km/h) |
| 100 mph (160.93 km/h) | 137.6 mph (221.45 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1707 | 1983 | 2136 | 2230 | 2332 | 2404 | 2484 | 2579 | 2709 | 2840 | 2985 | 3102 | 3312 | 3545 | 3726 | 3843 | 3908 | 4148 | 4482 | 5208 |
Better Fuel Economy Factory Ratios Increased Power
