Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 295/35-21 | 255/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.13 (739.9) | 29.03 (737.4) | -0.1 (-2.5) -0.3% |
| Width inches (mm) | 11.61 (295) | 10.04 (255) | -1.57 (-40) -13.6% |
| Circum. inches (mm) | 91.51 (2324.46) | 91.21 (2316.61) | -0.31 (-7.85) -0.3% |
| Sidewall Height inches (mm) | 4.06 (103.25) | 4.02 (102) | -0.05 (-1.25) -1.2% |
| Revolutions per mile (km) | 692.35 (430.21) | 694.7 (431.66) | 2.35 (1.46) 0.3% |
255/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.93 mph (32.08 km/h) |
| 25 mph (40.23 km/h) | 24.92 mph (40.1 km/h) |
| 30 mph (48.28 km/h) | 29.9 mph (48.12 km/h) |
| 35 mph (56.33 km/h) | 34.88 mph (56.14 km/h) |
| 40 mph (64.37 km/h) | 39.86 mph (64.16 km/h) |
| 45 mph (72.42 km/h) | 44.85 mph (72.18 km/h) |
| 50 mph (80.47 km/h) | 49.83 mph (80.2 km/h) |
| 55 mph (88.51 km/h) | 54.81 mph (88.22 km/h) |
| 60 mph (96.56 km/h) | 59.8 mph (96.23 km/h) |
| 65 mph (104.61 km/h) | 64.78 mph (104.25 km/h) |
| 70 mph (112.65 km/h) | 69.76 mph (112.27 km/h) |
| 75 mph (120.7 km/h) | 74.75 mph (120.29 km/h) |
| 80 mph (128.75 km/h) | 79.73 mph (128.31 km/h) |
| 85 mph (136.79 km/h) | 84.71 mph (136.33 km/h) |
| 90 mph (144.84 km/h) | 89.7 mph (144.35 km/h) |
| 95 mph (152.89 km/h) | 94.68 mph (152.37 km/h) |
| 100 mph (160.93 km/h) | 99.66 mph (160.39 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1768 | 2054 | 2212 | 2310 | 2415 | 2490 | 2573 | 2671 | 2806 | 2941 | 3092 | 3212 | 3430 | 3671 | 3859 | 3980 | 4047 | 4296 | 4642 | 5394 |
Better Fuel Economy Factory Ratios Increased Power
