Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/30-21 | 255/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.73 (704.4) | 28.03 (711.9) | 0.3 (7.5) 1.1% |
| Width inches (mm) | 11.22 (285) | 10.04 (255) | -1.18 (-30) -10.5% |
| Circum. inches (mm) | 87.12 (2212.94) | 88.05 (2236.5) | 0.93 (23.56) 1.1% |
| Sidewall Height inches (mm) | 3.37 (85.5) | 3.51 (89.25) | 0.15 (3.75) 4.4% |
| Revolutions per mile (km) | 727.24 (451.89) | 719.58 (447.13) | -7.66 (-4.76) -1.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.21 mph (32.53 km/h) |
| 25 mph (40.23 km/h) | 25.27 mph (40.66 km/h) |
| 30 mph (48.28 km/h) | 30.32 mph (48.79 km/h) |
| 35 mph (56.33 km/h) | 35.37 mph (56.93 km/h) |
| 40 mph (64.37 km/h) | 40.43 mph (65.06 km/h) |
| 45 mph (72.42 km/h) | 45.48 mph (73.19 km/h) |
| 50 mph (80.47 km/h) | 50.53 mph (81.32 km/h) |
| 55 mph (88.51 km/h) | 55.59 mph (89.46 km/h) |
| 60 mph (96.56 km/h) | 60.64 mph (97.59 km/h) |
| 65 mph (104.61 km/h) | 65.69 mph (105.72 km/h) |
| 70 mph (112.65 km/h) | 70.75 mph (113.85 km/h) |
| 75 mph (120.7 km/h) | 75.8 mph (121.99 km/h) |
| 80 mph (128.75 km/h) | 80.85 mph (130.12 km/h) |
| 85 mph (136.79 km/h) | 85.91 mph (138.25 km/h) |
| 90 mph (144.84 km/h) | 90.96 mph (146.38 km/h) |
| 95 mph (152.89 km/h) | 96.01 mph (154.52 km/h) |
| 100 mph (160.93 km/h) | 101.06 mph (162.65 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
