Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 270/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 28.5 (724) | 1.01 (25.6) 3.7% |
| Width inches (mm) | 10.83 (275) | 10.63 (270) | -0.2 (-5) -1.8% |
| Circum. inches (mm) | 86.38 (2194.09) | 89.55 (2274.51) | 3.17 (80.42) 3.7% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 4.25 (108) | 1 (25.5) 30.9% |
| Revolutions per mile (km) | 733.49 (455.77) | 707.56 (439.65) | -25.94 (-16.12) -3.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.73 mph (33.37 km/h) |
| 25 mph (40.23 km/h) | 25.92 mph (41.71 km/h) |
| 30 mph (48.28 km/h) | 31.1 mph (50.05 km/h) |
| 35 mph (56.33 km/h) | 36.28 mph (58.39 km/h) |
| 40 mph (64.37 km/h) | 41.47 mph (66.73 km/h) |
| 45 mph (72.42 km/h) | 46.65 mph (75.08 km/h) |
| 50 mph (80.47 km/h) | 51.83 mph (83.42 km/h) |
| 55 mph (88.51 km/h) | 57.02 mph (91.76 km/h) |
| 60 mph (96.56 km/h) | 62.2 mph (100.1 km/h) |
| 65 mph (104.61 km/h) | 67.38 mph (108.44 km/h) |
| 70 mph (112.65 km/h) | 72.57 mph (116.78 km/h) |
| 75 mph (120.7 km/h) | 77.75 mph (125.13 km/h) |
| 80 mph (128.75 km/h) | 82.93 mph (133.47 km/h) |
| 85 mph (136.79 km/h) | 88.12 mph (141.81 km/h) |
| 90 mph (144.84 km/h) | 93.3 mph (150.15 km/h) |
| 95 mph (152.89 km/h) | 98.48 mph (158.49 km/h) |
| 100 mph (160.93 km/h) | 103.67 mph (166.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1801 | 2092 | 2253 | 2352 | 2460 | 2536 | 2620 | 2720 | 2858 | 2996 | 3149 | 3272 | 3494 | 3739 | 3931 | 4053 | 4122 | 4375 | 4728 | 5494 |
Better Fuel Economy Factory Ratios Increased Power
