Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/30-21 | 215/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.2 (716.4) | 26.93 (683.9) | -1.28 (-32.5) -4.5% |
| Width inches (mm) | 12.01 (305) | 8.46 (215) | -3.54 (-90) -29.5% |
| Circum. inches (mm) | 88.61 (2250.64) | 84.59 (2148.54) | -4.02 (-102.1) -4.5% |
| Sidewall Height inches (mm) | 3.6 (91.5) | 2.96 (75.25) | -0.64 (-16.25) -17.8% |
| Revolutions per mile (km) | 715.06 (444.32) | 749.04 (465.43) | 33.98 (21.11) 4.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.09 mph (30.73 km/h) |
| 25 mph (40.23 km/h) | 23.87 mph (38.41 km/h) |
| 30 mph (48.28 km/h) | 28.64 mph (46.09 km/h) |
| 35 mph (56.33 km/h) | 33.41 mph (53.77 km/h) |
| 40 mph (64.37 km/h) | 38.19 mph (61.45 km/h) |
| 45 mph (72.42 km/h) | 42.96 mph (69.14 km/h) |
| 50 mph (80.47 km/h) | 47.73 mph (76.82 km/h) |
| 55 mph (88.51 km/h) | 52.5 mph (84.5 km/h) |
| 60 mph (96.56 km/h) | 57.28 mph (92.18 km/h) |
| 65 mph (104.61 km/h) | 62.05 mph (99.86 km/h) |
| 70 mph (112.65 km/h) | 66.82 mph (107.54 km/h) |
| 75 mph (120.7 km/h) | 71.6 mph (115.23 km/h) |
| 80 mph (128.75 km/h) | 76.37 mph (122.91 km/h) |
| 85 mph (136.79 km/h) | 81.14 mph (130.59 km/h) |
| 90 mph (144.84 km/h) | 85.92 mph (138.27 km/h) |
| 95 mph (152.89 km/h) | 90.69 mph (145.95 km/h) |
| 100 mph (160.93 km/h) | 95.46 mph (153.63 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1906 | 2214 | 2385 | 2490 | 2604 | 2685 | 2774 | 2880 | 3026 | 3172 | 3334 | 3464 | 3699 | 3958 | 4161 | 4291 | 4364 | 4632 | 5005 | 5816 |
Better Fuel Economy Factory Ratios Increased Power
