Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-21 | 235/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.72 (729.4) | 28.4 (721.4) | -0.31 (-8) -1.1% |
| Width inches (mm) | 9.65 (245) | 9.25 (235) | -0.39 (-10) -4.1% |
| Circum. inches (mm) | 90.22 (2291.48) | 89.23 (2266.34) | -0.99 (-25.13) -1.1% |
| Sidewall Height inches (mm) | 3.86 (98) | 3.7 (94) | -0.16 (-4) -4.1% |
| Revolutions per mile (km) | 702.32 (436.4) | 710.11 (441.24) | 7.79 (4.84) 1.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.78 mph (31.83 km/h) |
| 25 mph (40.23 km/h) | 24.73 mph (39.79 km/h) |
| 30 mph (48.28 km/h) | 29.67 mph (47.75 km/h) |
| 35 mph (56.33 km/h) | 34.62 mph (55.71 km/h) |
| 40 mph (64.37 km/h) | 39.56 mph (63.67 km/h) |
| 45 mph (72.42 km/h) | 44.51 mph (71.63 km/h) |
| 50 mph (80.47 km/h) | 49.45 mph (79.58 km/h) |
| 55 mph (88.51 km/h) | 54.4 mph (87.54 km/h) |
| 60 mph (96.56 km/h) | 59.34 mph (95.5 km/h) |
| 65 mph (104.61 km/h) | 64.29 mph (103.46 km/h) |
| 70 mph (112.65 km/h) | 69.23 mph (111.42 km/h) |
| 75 mph (120.7 km/h) | 74.18 mph (119.38 km/h) |
| 80 mph (128.75 km/h) | 79.12 mph (127.34 km/h) |
| 85 mph (136.79 km/h) | 84.07 mph (135.29 km/h) |
| 90 mph (144.84 km/h) | 89.01 mph (143.25 km/h) |
| 95 mph (152.89 km/h) | 93.96 mph (151.21 km/h) |
| 100 mph (160.93 km/h) | 98.9 mph (159.17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1807 | 2099 | 2261 | 2361 | 2468 | 2545 | 2630 | 2730 | 2868 | 3007 | 3160 | 3284 | 3507 | 3753 | 3945 | 4068 | 4137 | 4391 | 4745 | 5514 |
Better Fuel Economy Factory Ratios Increased Power
