Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/40-22 | 255/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.35 (770.8) | 29.03 (737.4) | -1.31 (-33.4) -4.3% |
| Width inches (mm) | 10.43 (265) | 10.04 (255) | -0.39 (-10) -3.8% |
| Circum. inches (mm) | 95.34 (2421.54) | 91.21 (2316.61) | -4.13 (-104.93) -4.3% |
| Sidewall Height inches (mm) | 4.17 (106) | 4.02 (102) | -0.16 (-4) -3.8% |
| Revolutions per mile (km) | 664.6 (412.96) | 694.7 (431.66) | 30.1 (18.7) 4.5% |
255/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.13 mph (30.79 km/h) |
| 25 mph (40.23 km/h) | 23.92 mph (38.49 km/h) |
| 30 mph (48.28 km/h) | 28.7 mph (46.19 km/h) |
| 35 mph (56.33 km/h) | 33.48 mph (53.89 km/h) |
| 40 mph (64.37 km/h) | 38.27 mph (61.58 km/h) |
| 45 mph (72.42 km/h) | 43.05 mph (69.28 km/h) |
| 50 mph (80.47 km/h) | 47.83 mph (76.98 km/h) |
| 55 mph (88.51 km/h) | 52.62 mph (84.68 km/h) |
| 60 mph (96.56 km/h) | 57.4 mph (92.38 km/h) |
| 65 mph (104.61 km/h) | 62.18 mph (100.07 km/h) |
| 70 mph (112.65 km/h) | 66.97 mph (107.77 km/h) |
| 75 mph (120.7 km/h) | 71.75 mph (115.47 km/h) |
| 80 mph (128.75 km/h) | 76.53 mph (123.17 km/h) |
| 85 mph (136.79 km/h) | 81.32 mph (130.87 km/h) |
| 90 mph (144.84 km/h) | 86.1 mph (138.57 km/h) |
| 95 mph (152.89 km/h) | 90.88 mph (146.26 km/h) |
| 100 mph (160.93 km/h) | 95.67 mph (153.96 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
