Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 255/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 28.03 (711.9) | 0.53 (13.5) 1.9% |
| Width inches (mm) | 10.83 (275) | 10.04 (255) | -0.79 (-20) -7.3% |
| Circum. inches (mm) | 86.38 (2194.09) | 88.05 (2236.5) | 1.67 (42.41) 1.9% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 3.51 (89.25) | 0.27 (6.75) 8.2% |
| Revolutions per mile (km) | 733.49 (455.77) | 719.58 (447.13) | -13.91 (-8.64) -1.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.39 mph (32.81 km/h) |
| 25 mph (40.23 km/h) | 25.48 mph (41.01 km/h) |
| 30 mph (48.28 km/h) | 30.58 mph (49.21 km/h) |
| 35 mph (56.33 km/h) | 35.68 mph (57.42 km/h) |
| 40 mph (64.37 km/h) | 40.77 mph (65.62 km/h) |
| 45 mph (72.42 km/h) | 45.87 mph (73.82 km/h) |
| 50 mph (80.47 km/h) | 50.97 mph (82.02 km/h) |
| 55 mph (88.51 km/h) | 56.06 mph (90.23 km/h) |
| 60 mph (96.56 km/h) | 61.16 mph (98.43 km/h) |
| 65 mph (104.61 km/h) | 66.26 mph (106.63 km/h) |
| 70 mph (112.65 km/h) | 71.35 mph (114.83 km/h) |
| 75 mph (120.7 km/h) | 76.45 mph (123.03 km/h) |
| 80 mph (128.75 km/h) | 81.55 mph (131.24 km/h) |
| 85 mph (136.79 km/h) | 86.64 mph (139.44 km/h) |
| 90 mph (144.84 km/h) | 91.74 mph (147.64 km/h) |
| 95 mph (152.89 km/h) | 96.84 mph (155.84 km/h) |
| 100 mph (160.93 km/h) | 101.93 mph (164.05 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1831 | 2127 | 2291 | 2392 | 2501 | 2579 | 2665 | 2766 | 2907 | 3047 | 3203 | 3327 | 3553 | 3803 | 3997 | 4122 | 4192 | 4449 | 4808 | 5587 |
Better Fuel Economy Factory Ratios Increased Power
