Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/85-15 | 30/9.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.73 (780.5) | 29.99 (761.78) | -0.74 (-18.72) -2.4% |
| Width inches (mm) | 9.25 (235) | 9.49 (241) | 0.24 (6) 2.6% |
| Circum. inches (mm) | 96.54 (2452.01) | 94.22 (2393.2) | -2.32 (-58.81) -2.4% |
| Sidewall Height inches (mm) | 7.86 (199.75) | 7.5 (190.39) | -0.37 (-9.36) -4.7% |
| Revolutions per mile (km) | 656.34 (407.83) | 672.46 (417.85) | 16.13 (10.02) 2.5% |
30/9.5-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.52 mph (31.41 km/h) |
| 25 mph (40.23 km/h) | 24.4 mph (39.27 km/h) |
| 30 mph (48.28 km/h) | 29.28 mph (47.12 km/h) |
| 35 mph (56.33 km/h) | 34.16 mph (54.98 km/h) |
| 40 mph (64.37 km/h) | 39.04 mph (62.83 km/h) |
| 45 mph (72.42 km/h) | 43.92 mph (70.68 km/h) |
| 50 mph (80.47 km/h) | 48.8 mph (78.54 km/h) |
| 55 mph (88.51 km/h) | 53.68 mph (86.39 km/h) |
| 60 mph (96.56 km/h) | 58.56 mph (94.24 km/h) |
| 65 mph (104.61 km/h) | 63.44 mph (102.1 km/h) |
| 70 mph (112.65 km/h) | 68.32 mph (109.95 km/h) |
| 75 mph (120.7 km/h) | 73.2 mph (117.81 km/h) |
| 80 mph (128.75 km/h) | 78.08 mph (125.66 km/h) |
| 85 mph (136.79 km/h) | 82.96 mph (133.51 km/h) |
| 90 mph (144.84 km/h) | 87.84 mph (141.37 km/h) |
| 95 mph (152.89 km/h) | 92.72 mph (149.22 km/h) |
| 100 mph (160.93 km/h) | 97.6 mph (157.07 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
