Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/30-21 | 235/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.02 (686.4) | 25.63 (650.9) | -1.4 (-35.5) -5.2% |
| Width inches (mm) | 10.04 (255) | 9.25 (235) | -0.79 (-20) -7.8% |
| Circum. inches (mm) | 84.9 (2156.39) | 80.51 (2044.86) | -4.39 (-111.53) -5.2% |
| Sidewall Height inches (mm) | 3.01 (76.5) | 2.31 (58.75) | -0.7 (-17.75) -23.2% |
| Revolutions per mile (km) | 746.31 (463.74) | 787.02 (489.03) | 40.7 (25.29) 5.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.97 mph (30.52 km/h) |
| 25 mph (40.23 km/h) | 23.71 mph (38.15 km/h) |
| 30 mph (48.28 km/h) | 28.45 mph (45.78 km/h) |
| 35 mph (56.33 km/h) | 33.19 mph (53.41 km/h) |
| 40 mph (64.37 km/h) | 37.93 mph (61.04 km/h) |
| 45 mph (72.42 km/h) | 42.67 mph (68.68 km/h) |
| 50 mph (80.47 km/h) | 47.41 mph (76.31 km/h) |
| 55 mph (88.51 km/h) | 52.16 mph (83.94 km/h) |
| 60 mph (96.56 km/h) | 56.9 mph (91.57 km/h) |
| 65 mph (104.61 km/h) | 61.64 mph (99.2 km/h) |
| 70 mph (112.65 km/h) | 66.38 mph (106.83 km/h) |
| 75 mph (120.7 km/h) | 71.12 mph (114.46 km/h) |
| 80 mph (128.75 km/h) | 75.86 mph (122.09 km/h) |
| 85 mph (136.79 km/h) | 80.6 mph (129.72 km/h) |
| 90 mph (144.84 km/h) | 85.35 mph (137.35 km/h) |
| 95 mph (152.89 km/h) | 90.09 mph (144.98 km/h) |
| 100 mph (160.93 km/h) | 94.83 mph (152.61 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2003 | 2327 | 2506 | 2616 | 2736 | 2821 | 2915 | 3026 | 3179 | 3332 | 3503 | 3639 | 3886 | 4159 | 4372 | 4508 | 4585 | 4866 | 5258 | 6111 |
Better Fuel Economy Factory Ratios Increased Power
