Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-21 | 235/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.72 (729.4) | 29.33 (744.9) | 0.61 (15.5) 2.1% |
| Width inches (mm) | 9.65 (245) | 9.25 (235) | -0.39 (-10) -4.1% |
| Circum. inches (mm) | 90.22 (2291.48) | 92.13 (2340.17) | 1.92 (48.69) 2.1% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.16 (105.75) | 0.31 (7.75) 7.9% |
| Revolutions per mile (km) | 702.32 (436.4) | 687.7 (427.32) | -14.61 (-9.08) -2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.43 mph (32.87 km/h) |
| 25 mph (40.23 km/h) | 25.53 mph (41.09 km/h) |
| 30 mph (48.28 km/h) | 30.64 mph (49.31 km/h) |
| 35 mph (56.33 km/h) | 35.74 mph (57.52 km/h) |
| 40 mph (64.37 km/h) | 40.85 mph (65.74 km/h) |
| 45 mph (72.42 km/h) | 45.96 mph (73.96 km/h) |
| 50 mph (80.47 km/h) | 51.06 mph (82.18 km/h) |
| 55 mph (88.51 km/h) | 56.17 mph (90.4 km/h) |
| 60 mph (96.56 km/h) | 61.28 mph (98.61 km/h) |
| 65 mph (104.61 km/h) | 66.38 mph (106.83 km/h) |
| 70 mph (112.65 km/h) | 71.49 mph (115.05 km/h) |
| 75 mph (120.7 km/h) | 76.59 mph (123.27 km/h) |
| 80 mph (128.75 km/h) | 81.7 mph (131.48 km/h) |
| 85 mph (136.79 km/h) | 86.81 mph (139.7 km/h) |
| 90 mph (144.84 km/h) | 91.91 mph (147.92 km/h) |
| 95 mph (152.89 km/h) | 97.02 mph (156.14 km/h) |
| 100 mph (160.93 km/h) | 102.13 mph (164.35 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1750 | 2033 | 2189 | 2286 | 2391 | 2465 | 2547 | 2644 | 2778 | 2912 | 3061 | 3180 | 3396 | 3634 | 3820 | 3940 | 4007 | 4252 | 4595 | 5340 |
Better Fuel Economy Factory Ratios Increased Power
