Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/80-15 | 30/9.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.17 (741) | 29.99 (761.78) | 0.82 (20.78) 2.8% |
| Width inches (mm) | 8.86 (225) | 9.49 (241) | 0.63 (16) 7.1% |
| Circum. inches (mm) | 91.65 (2327.92) | 94.22 (2393.2) | 2.57 (65.28) 2.8% |
| Sidewall Height inches (mm) | 7.09 (180) | 7.5 (190.39) | 0.41 (10.39) 5.8% |
| Revolutions per mile (km) | 691.32 (429.57) | 672.46 (417.85) | -18.86 (-11.72) -2.7% |
30/9.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.56 mph (33.09 km/h) |
| 25 mph (40.23 km/h) | 25.7 mph (41.36 km/h) |
| 30 mph (48.28 km/h) | 30.84 mph (49.63 km/h) |
| 35 mph (56.33 km/h) | 35.98 mph (57.91 km/h) |
| 40 mph (64.37 km/h) | 41.12 mph (66.18 km/h) |
| 45 mph (72.42 km/h) | 46.26 mph (74.45 km/h) |
| 50 mph (80.47 km/h) | 51.4 mph (82.72 km/h) |
| 55 mph (88.51 km/h) | 56.54 mph (91 km/h) |
| 60 mph (96.56 km/h) | 61.68 mph (99.27 km/h) |
| 65 mph (104.61 km/h) | 66.82 mph (107.54 km/h) |
| 70 mph (112.65 km/h) | 71.96 mph (115.81 km/h) |
| 75 mph (120.7 km/h) | 77.1 mph (124.09 km/h) |
| 80 mph (128.75 km/h) | 82.24 mph (132.36 km/h) |
| 85 mph (136.79 km/h) | 87.38 mph (140.63 km/h) |
| 90 mph (144.84 km/h) | 92.52 mph (148.9 km/h) |
| 95 mph (152.89 km/h) | 97.66 mph (157.18 km/h) |
| 100 mph (160.93 km/h) | 102.8 mph (165.45 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1711 | 1988 | 2141 | 2236 | 2338 | 2410 | 2490 | 2585 | 2716 | 2847 | 2993 | 3109 | 3321 | 3554 | 3736 | 3852 | 3918 | 4158 | 4493 | 5221 |
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