Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/30-21 | 225/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.02 (686.4) | 25.43 (645.9) | -1.59 (-40.5) -5.9% |
| Width inches (mm) | 10.04 (255) | 8.86 (225) | -1.18 (-30) -11.8% |
| Circum. inches (mm) | 84.9 (2156.39) | 79.89 (2029.15) | -5.01 (-127.23) -5.9% |
| Sidewall Height inches (mm) | 3.01 (76.5) | 2.21 (56.25) | -0.8 (-20.25) -26.5% |
| Revolutions per mile (km) | 746.31 (463.74) | 793.11 (492.82) | 46.8 (29.08) 6.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.82 mph (30.29 km/h) |
| 25 mph (40.23 km/h) | 23.52 mph (37.86 km/h) |
| 30 mph (48.28 km/h) | 28.23 mph (45.43 km/h) |
| 35 mph (56.33 km/h) | 32.93 mph (53 km/h) |
| 40 mph (64.37 km/h) | 37.64 mph (60.58 km/h) |
| 45 mph (72.42 km/h) | 42.34 mph (68.15 km/h) |
| 50 mph (80.47 km/h) | 47.05 mph (75.72 km/h) |
| 55 mph (88.51 km/h) | 51.75 mph (83.29 km/h) |
| 60 mph (96.56 km/h) | 56.46 mph (90.86 km/h) |
| 65 mph (104.61 km/h) | 61.16 mph (98.44 km/h) |
| 70 mph (112.65 km/h) | 65.87 mph (106.01 km/h) |
| 75 mph (120.7 km/h) | 70.57 mph (113.58 km/h) |
| 80 mph (128.75 km/h) | 75.28 mph (121.15 km/h) |
| 85 mph (136.79 km/h) | 79.98 mph (128.72 km/h) |
| 90 mph (144.84 km/h) | 84.69 mph (136.3 km/h) |
| 95 mph (152.89 km/h) | 89.39 mph (143.87 km/h) |
| 100 mph (160.93 km/h) | 94.1 mph (151.44 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2018 | 2345 | 2525 | 2637 | 2757 | 2843 | 2937 | 3049 | 3204 | 3358 | 3530 | 3667 | 3916 | 4191 | 4406 | 4543 | 4621 | 4904 | 5299 | 6158 |
Better Fuel Economy Factory Ratios Increased Power
