Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-21 | 235/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.4) | 26.55 (674.4) | -0.24 (-6) -0.9% |
| Width inches (mm) | 9.65 (245) | 9.25 (235) | -0.39 (-10) -4.1% |
| Circum. inches (mm) | 84.16 (2137.54) | 83.41 (2118.69) | -0.74 (-18.85) -0.9% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 2.78 (70.5) | -0.12 (-3) -4.1% |
| Revolutions per mile (km) | 752.9 (467.83) | 759.59 (471.99) | 6.7 (4.16) 0.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.82 mph (31.9 km/h) |
| 25 mph (40.23 km/h) | 24.78 mph (39.88 km/h) |
| 30 mph (48.28 km/h) | 29.74 mph (47.85 km/h) |
| 35 mph (56.33 km/h) | 34.69 mph (55.83 km/h) |
| 40 mph (64.37 km/h) | 39.65 mph (63.81 km/h) |
| 45 mph (72.42 km/h) | 44.6 mph (71.78 km/h) |
| 50 mph (80.47 km/h) | 49.56 mph (79.76 km/h) |
| 55 mph (88.51 km/h) | 54.51 mph (87.73 km/h) |
| 60 mph (96.56 km/h) | 59.47 mph (95.71 km/h) |
| 65 mph (104.61 km/h) | 64.43 mph (103.69 km/h) |
| 70 mph (112.65 km/h) | 69.38 mph (111.66 km/h) |
| 75 mph (120.7 km/h) | 74.34 mph (119.64 km/h) |
| 80 mph (128.75 km/h) | 79.29 mph (127.61 km/h) |
| 85 mph (136.79 km/h) | 84.25 mph (135.59 km/h) |
| 90 mph (144.84 km/h) | 89.21 mph (143.56 km/h) |
| 95 mph (152.89 km/h) | 94.16 mph (151.54 km/h) |
| 100 mph (160.93 km/h) | 99.12 mph (159.52 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1933 | 2246 | 2418 | 2525 | 2640 | 2723 | 2813 | 2920 | 3068 | 3216 | 3381 | 3512 | 3751 | 4014 | 4220 | 4351 | 4425 | 4697 | 5075 | 5898 |
Better Fuel Economy Factory Ratios Increased Power
