Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-21 | 235/50-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.97 (735.9) | 30.25 (768.4) | 1.28 (32.5) 4.4% |
| Width inches (mm) | 8.86 (225) | 9.25 (235) | 0.39 (10) 4.4% |
| Circum. inches (mm) | 91.02 (2311.9) | 95.04 (2414) | 4.02 (102.1) 4.4% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 4.63 (117.5) | 0.64 (16.25) 16% |
| Revolutions per mile (km) | 696.11 (432.54) | 666.67 (414.25) | -29.44 (-18.29) -4.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.88 mph (33.61 km/h) |
| 25 mph (40.23 km/h) | 26.1 mph (42.01 km/h) |
| 30 mph (48.28 km/h) | 31.32 mph (50.41 km/h) |
| 35 mph (56.33 km/h) | 36.55 mph (58.81 km/h) |
| 40 mph (64.37 km/h) | 41.77 mph (67.22 km/h) |
| 45 mph (72.42 km/h) | 46.99 mph (75.62 km/h) |
| 50 mph (80.47 km/h) | 52.21 mph (84.02 km/h) |
| 55 mph (88.51 km/h) | 57.43 mph (92.42 km/h) |
| 60 mph (96.56 km/h) | 62.65 mph (100.83 km/h) |
| 65 mph (104.61 km/h) | 67.87 mph (109.23 km/h) |
| 70 mph (112.65 km/h) | 73.09 mph (117.63 km/h) |
| 75 mph (120.7 km/h) | 78.31 mph (126.03 km/h) |
| 80 mph (128.75 km/h) | 83.53 mph (134.43 km/h) |
| 85 mph (136.79 km/h) | 88.75 mph (142.84 km/h) |
| 90 mph (144.84 km/h) | 93.97 mph (151.24 km/h) |
| 95 mph (152.89 km/h) | 99.2 mph (159.64 km/h) |
| 100 mph (160.93 km/h) | 104.42 mph (168.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1697 | 1971 | 2122 | 2216 | 2317 | 2390 | 2469 | 2563 | 2693 | 2823 | 2967 | 3083 | 3292 | 3523 | 3704 | 3819 | 3884 | 4122 | 4454 | 5176 |
Better Fuel Economy Factory Ratios Increased Power
