Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-21 | 255/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.72 (729.4) | 28.03 (711.9) | -0.69 (-17.5) -2.4% |
| Width inches (mm) | 9.65 (245) | 10.04 (255) | 0.39 (10) 4.1% |
| Circum. inches (mm) | 90.22 (2291.48) | 88.05 (2236.5) | -2.16 (-54.98) -2.4% |
| Sidewall Height inches (mm) | 3.86 (98) | 3.51 (89.25) | -0.34 (-8.75) -8.9% |
| Revolutions per mile (km) | 702.32 (436.4) | 719.58 (447.13) | 17.26 (10.73) 2.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.52 mph (31.41 km/h) |
| 25 mph (40.23 km/h) | 24.4 mph (39.27 km/h) |
| 30 mph (48.28 km/h) | 29.28 mph (47.12 km/h) |
| 35 mph (56.33 km/h) | 34.16 mph (54.98 km/h) |
| 40 mph (64.37 km/h) | 39.04 mph (62.83 km/h) |
| 45 mph (72.42 km/h) | 43.92 mph (70.68 km/h) |
| 50 mph (80.47 km/h) | 48.8 mph (78.54 km/h) |
| 55 mph (88.51 km/h) | 53.68 mph (86.39 km/h) |
| 60 mph (96.56 km/h) | 58.56 mph (94.24 km/h) |
| 65 mph (104.61 km/h) | 63.44 mph (102.1 km/h) |
| 70 mph (112.65 km/h) | 68.32 mph (109.95 km/h) |
| 75 mph (120.7 km/h) | 73.2 mph (117.81 km/h) |
| 80 mph (128.75 km/h) | 78.08 mph (125.66 km/h) |
| 85 mph (136.79 km/h) | 82.96 mph (133.51 km/h) |
| 90 mph (144.84 km/h) | 87.84 mph (141.37 km/h) |
| 95 mph (152.89 km/h) | 92.72 mph (149.22 km/h) |
| 100 mph (160.93 km/h) | 97.6 mph (157.07 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
