Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-21 | 255/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.03 (737.4) | 28.03 (711.9) | -1 (-25.5) -3.5% |
| Width inches (mm) | 10.04 (255) | 10.04 (255) | 0 (0) 0% |
| Circum. inches (mm) | 91.21 (2316.61) | 88.05 (2236.5) | -3.15 (-80.11) -3.5% |
| Sidewall Height inches (mm) | 4.02 (102) | 3.51 (89.25) | -0.5 (-12.75) -12.5% |
| Revolutions per mile (km) | 694.7 (431.66) | 719.58 (447.13) | 24.88 (15.46) 3.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.31 mph (31.07 km/h) |
| 25 mph (40.23 km/h) | 24.14 mph (38.84 km/h) |
| 30 mph (48.28 km/h) | 28.96 mph (46.61 km/h) |
| 35 mph (56.33 km/h) | 33.79 mph (54.38 km/h) |
| 40 mph (64.37 km/h) | 38.62 mph (62.15 km/h) |
| 45 mph (72.42 km/h) | 43.44 mph (69.92 km/h) |
| 50 mph (80.47 km/h) | 48.27 mph (77.68 km/h) |
| 55 mph (88.51 km/h) | 53.1 mph (85.45 km/h) |
| 60 mph (96.56 km/h) | 57.93 mph (93.22 km/h) |
| 65 mph (104.61 km/h) | 62.75 mph (100.99 km/h) |
| 70 mph (112.65 km/h) | 67.58 mph (108.76 km/h) |
| 75 mph (120.7 km/h) | 72.41 mph (116.53 km/h) |
| 80 mph (128.75 km/h) | 77.23 mph (124.3 km/h) |
| 85 mph (136.79 km/h) | 82.06 mph (132.06 km/h) |
| 90 mph (144.84 km/h) | 86.89 mph (139.83 km/h) |
| 95 mph (152.89 km/h) | 91.71 mph (147.6 km/h) |
| 100 mph (160.93 km/h) | 96.54 mph (155.37 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
