Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/35-21 | 30/10.5-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.58 (725.9) | 30.04 (763.02) | 1.46 (37.12) 5.1% |
| Width inches (mm) | 10.83 (275) | 10.51 (267) | -0.31 (-8) -2.9% |
| Circum. inches (mm) | 89.78 (2280.48) | 94.37 (2397.1) | 4.59 (116.62) 5.1% |
| Sidewall Height inches (mm) | 3.79 (96.25) | 4.52 (114.81) | 0.73 (18.56) 19.3% |
| Revolutions per mile (km) | 705.7 (438.5) | 671.37 (417.17) | -34.33 (-21.33) -4.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.02 mph (33.83 km/h) |
| 25 mph (40.23 km/h) | 26.28 mph (42.29 km/h) |
| 30 mph (48.28 km/h) | 31.53 mph (50.75 km/h) |
| 35 mph (56.33 km/h) | 36.79 mph (59.21 km/h) |
| 40 mph (64.37 km/h) | 42.05 mph (67.67 km/h) |
| 45 mph (72.42 km/h) | 47.3 mph (76.12 km/h) |
| 50 mph (80.47 km/h) | 52.56 mph (84.58 km/h) |
| 55 mph (88.51 km/h) | 57.81 mph (93.04 km/h) |
| 60 mph (96.56 km/h) | 63.07 mph (101.5 km/h) |
| 65 mph (104.61 km/h) | 68.32 mph (109.96 km/h) |
| 70 mph (112.65 km/h) | 73.58 mph (118.42 km/h) |
| 75 mph (120.7 km/h) | 78.84 mph (126.87 km/h) |
| 80 mph (128.75 km/h) | 84.09 mph (135.33 km/h) |
| 85 mph (136.79 km/h) | 89.35 mph (143.79 km/h) |
| 90 mph (144.84 km/h) | 94.6 mph (152.25 km/h) |
| 95 mph (152.89 km/h) | 99.86 mph (160.71 km/h) |
| 100 mph (160.93 km/h) | 105.11 mph (169.16 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1709 | 1985 | 2137 | 2232 | 2334 | 2406 | 2486 | 2581 | 2712 | 2843 | 2988 | 3104 | 3315 | 3548 | 3730 | 3846 | 3911 | 4151 | 4486 | 5213 |
Better Fuel Economy Factory Ratios Increased Power
