Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/80-15 | 30/9.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.54 (725) | 29.99 (761.78) | 1.45 (36.78) 5.1% |
| Width inches (mm) | 8.46 (215) | 9.49 (241) | 1.02 (26) 12.1% |
| Circum. inches (mm) | 89.67 (2277.65) | 94.22 (2393.2) | 4.55 (115.55) 5.1% |
| Sidewall Height inches (mm) | 6.77 (172) | 7.5 (190.39) | 0.72 (18.39) 10.7% |
| Revolutions per mile (km) | 706.58 (439.05) | 672.46 (417.85) | -34.11 (-21.2) -4.8% |
30/9.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.01 mph (33.82 km/h) |
| 25 mph (40.23 km/h) | 26.27 mph (42.27 km/h) |
| 30 mph (48.28 km/h) | 31.52 mph (50.73 km/h) |
| 35 mph (56.33 km/h) | 36.78 mph (59.18 km/h) |
| 40 mph (64.37 km/h) | 42.03 mph (67.64 km/h) |
| 45 mph (72.42 km/h) | 47.28 mph (76.09 km/h) |
| 50 mph (80.47 km/h) | 52.54 mph (84.55 km/h) |
| 55 mph (88.51 km/h) | 57.79 mph (93 km/h) |
| 60 mph (96.56 km/h) | 63.04 mph (101.46 km/h) |
| 65 mph (104.61 km/h) | 68.3 mph (109.91 km/h) |
| 70 mph (112.65 km/h) | 73.55 mph (118.37 km/h) |
| 75 mph (120.7 km/h) | 78.8 mph (126.82 km/h) |
| 80 mph (128.75 km/h) | 84.06 mph (135.28 km/h) |
| 85 mph (136.79 km/h) | 89.31 mph (143.73 km/h) |
| 90 mph (144.84 km/h) | 94.57 mph (152.19 km/h) |
| 95 mph (152.89 km/h) | 99.82 mph (160.64 km/h) |
| 100 mph (160.93 km/h) | 105.07 mph (169.1 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1711 | 1988 | 2141 | 2236 | 2338 | 2410 | 2490 | 2585 | 2716 | 2847 | 2993 | 3109 | 3321 | 3554 | 3736 | 3852 | 3918 | 4158 | 4493 | 5221 |
Better Fuel Economy Factory Ratios Increased Power
