Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-21 | 33/12.5-22 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.91 (835.9) | 33.02 (838.64) | 0.11 (2.74) 0.3% |
| Width inches (mm) | 10.83 (275) | 12.52 (318) | 1.69 (43) 15.6% |
| Circum. inches (mm) | 103.39 (2626.06) | 103.73 (2634.67) | 0.34 (8.61) 0.3% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 5.51 (139.92) | -0.45 (-11.33) -7.5% |
| Revolutions per mile (km) | 612.84 (380.8) | 610.83 (379.55) | -2 (-1.24) -0.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.07 mph (32.29 km/h) |
| 25 mph (40.23 km/h) | 25.08 mph (40.37 km/h) |
| 30 mph (48.28 km/h) | 30.1 mph (48.44 km/h) |
| 35 mph (56.33 km/h) | 35.11 mph (56.51 km/h) |
| 40 mph (64.37 km/h) | 40.13 mph (64.58 km/h) |
| 45 mph (72.42 km/h) | 45.15 mph (72.66 km/h) |
| 50 mph (80.47 km/h) | 50.16 mph (80.73 km/h) |
| 55 mph (88.51 km/h) | 55.18 mph (88.8 km/h) |
| 60 mph (96.56 km/h) | 60.2 mph (96.88 km/h) |
| 65 mph (104.61 km/h) | 65.21 mph (104.95 km/h) |
| 70 mph (112.65 km/h) | 70.23 mph (113.02 km/h) |
| 75 mph (120.7 km/h) | 75.25 mph (121.1 km/h) |
| 80 mph (128.75 km/h) | 80.26 mph (129.17 km/h) |
| 85 mph (136.79 km/h) | 85.28 mph (137.24 km/h) |
| 90 mph (144.84 km/h) | 90.3 mph (145.32 km/h) |
| 95 mph (152.89 km/h) | 95.31 mph (153.39 km/h) |
| 100 mph (160.93 km/h) | 100.33 mph (161.46 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
