Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/80-17 | 235/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.39 (695.8) | 29.33 (744.9) | 1.93 (49.1) 7.1% |
| Width inches (mm) | 6.5 (165) | 9.25 (235) | 2.76 (70) 42.4% |
| Circum. inches (mm) | 86.06 (2185.92) | 92.13 (2340.17) | 6.07 (154.25) 7.1% |
| Sidewall Height inches (mm) | 5.2 (132) | 4.16 (105.75) | -1.03 (-26.25) -19.9% |
| Revolutions per mile (km) | 736.23 (457.47) | 687.7 (427.32) | -48.53 (-30.15) -6.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.41 mph (34.46 km/h) |
| 25 mph (40.23 km/h) | 26.76 mph (43.07 km/h) |
| 30 mph (48.28 km/h) | 32.12 mph (51.69 km/h) |
| 35 mph (56.33 km/h) | 37.47 mph (60.3 km/h) |
| 40 mph (64.37 km/h) | 42.82 mph (68.92 km/h) |
| 45 mph (72.42 km/h) | 48.18 mph (77.53 km/h) |
| 50 mph (80.47 km/h) | 53.53 mph (86.15 km/h) |
| 55 mph (88.51 km/h) | 58.88 mph (94.76 km/h) |
| 60 mph (96.56 km/h) | 64.23 mph (103.37 km/h) |
| 65 mph (104.61 km/h) | 69.59 mph (111.99 km/h) |
| 70 mph (112.65 km/h) | 74.94 mph (120.6 km/h) |
| 75 mph (120.7 km/h) | 80.29 mph (129.22 km/h) |
| 80 mph (128.75 km/h) | 85.65 mph (137.83 km/h) |
| 85 mph (136.79 km/h) | 91 mph (146.45 km/h) |
| 90 mph (144.84 km/h) | 96.35 mph (155.06 km/h) |
| 95 mph (152.89 km/h) | 101.7 mph (163.68 km/h) |
| 100 mph (160.93 km/h) | 107.06 mph (172.29 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
