Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/25-21 | 33/12.5-22 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27 (685.9) | 33.02 (838.64) | 6.01 (152.74) 22.3% |
| Width inches (mm) | 12.01 (305) | 12.52 (318) | 0.51 (13) 4.3% |
| Circum. inches (mm) | 84.84 (2154.82) | 103.73 (2634.67) | 18.89 (479.85) 22.3% |
| Sidewall Height inches (mm) | 3 (76.25) | 5.51 (139.92) | 2.51 (63.67) 83.5% |
| Revolutions per mile (km) | 746.86 (464.08) | 610.83 (379.55) | -136.02 (-84.52) -18.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.45 mph (39.35 km/h) |
| 25 mph (40.23 km/h) | 30.57 mph (49.19 km/h) |
| 30 mph (48.28 km/h) | 36.68 mph (59.03 km/h) |
| 35 mph (56.33 km/h) | 42.79 mph (68.87 km/h) |
| 40 mph (64.37 km/h) | 48.91 mph (78.71 km/h) |
| 45 mph (72.42 km/h) | 55.02 mph (88.55 km/h) |
| 50 mph (80.47 km/h) | 61.13 mph (98.39 km/h) |
| 55 mph (88.51 km/h) | 67.25 mph (108.22 km/h) |
| 60 mph (96.56 km/h) | 73.36 mph (118.06 km/h) |
| 65 mph (104.61 km/h) | 79.47 mph (127.9 km/h) |
| 70 mph (112.65 km/h) | 85.59 mph (137.74 km/h) |
| 75 mph (120.7 km/h) | 91.7 mph (147.58 km/h) |
| 80 mph (128.75 km/h) | 97.81 mph (157.42 km/h) |
| 85 mph (136.79 km/h) | 103.93 mph (167.26 km/h) |
| 90 mph (144.84 km/h) | 110.04 mph (177.1 km/h) |
| 95 mph (152.89 km/h) | 116.16 mph (186.93 km/h) |
| 100 mph (160.93 km/h) | 122.27 mph (196.77 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1554 | 1806 | 1945 | 2031 | 2123 | 2189 | 2262 | 2348 | 2467 | 2586 | 2719 | 2824 | 3016 | 3228 | 3393 | 3499 | 3559 | 3777 | 4081 | 4743 |
Better Fuel Economy Factory Ratios Increased Power
