Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 295/30-21 | 305/55-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.97 (710.4) | 34.21 (868.9) | 6.24 (158.5) 22.3% |
| Width inches (mm) | 11.61 (295) | 12.01 (305) | 0.39 (10) 3.4% |
| Circum. inches (mm) | 87.87 (2231.79) | 107.47 (2729.73) | 19.6 (497.94) 22.3% |
| Sidewall Height inches (mm) | 3.48 (88.5) | 6.6 (167.75) | 3.12 (79.25) 89.5% |
| Revolutions per mile (km) | 721.1 (448.07) | 589.56 (366.34) | -131.54 (-81.73) -18.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.46 mph (39.37 km/h) |
| 25 mph (40.23 km/h) | 30.58 mph (49.21 km/h) |
| 30 mph (48.28 km/h) | 36.69 mph (59.05 km/h) |
| 35 mph (56.33 km/h) | 42.81 mph (68.89 km/h) |
| 40 mph (64.37 km/h) | 48.92 mph (78.74 km/h) |
| 45 mph (72.42 km/h) | 55.04 mph (88.58 km/h) |
| 50 mph (80.47 km/h) | 61.16 mph (98.42 km/h) |
| 55 mph (88.51 km/h) | 67.27 mph (108.26 km/h) |
| 60 mph (96.56 km/h) | 73.39 mph (118.1 km/h) |
| 65 mph (104.61 km/h) | 79.5 mph (127.95 km/h) |
| 70 mph (112.65 km/h) | 85.62 mph (137.79 km/h) |
| 75 mph (120.7 km/h) | 91.73 mph (147.63 km/h) |
| 80 mph (128.75 km/h) | 97.85 mph (157.47 km/h) |
| 85 mph (136.79 km/h) | 103.96 mph (167.32 km/h) |
| 90 mph (144.84 km/h) | 110.08 mph (177.16 km/h) |
| 95 mph (152.89 km/h) | 116.2 mph (187 km/h) |
| 100 mph (160.93 km/h) | 122.31 mph (196.84 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1500 | 1743 | 1877 | 1960 | 2049 | 2113 | 2183 | 2266 | 2381 | 2496 | 2624 | 2726 | 2911 | 3116 | 3275 | 3377 | 3435 | 3645 | 3939 | 4578 |
Better Fuel Economy Factory Ratios Increased Power
