Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 100/90-21 | 100/90-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.09 (713.4) | 26.09 (662.6) | -2 (-50.8) -7.1% |
| Width inches (mm) | 3.94 (100) | 3.94 (100) | 0 (0) 0% |
| Circum. inches (mm) | 88.24 (2241.21) | 81.95 (2081.62) | -6.28 (-159.59) -7.1% |
| Sidewall Height inches (mm) | 3.54 (90) | 3.54 (90) | 0 (0) 0% |
| Revolutions per mile (km) | 718.07 (446.19) | 773.12 (480.39) | 55.05 (34.21) 7.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.58 mph (29.89 km/h) |
| 25 mph (40.23 km/h) | 23.22 mph (37.37 km/h) |
| 30 mph (48.28 km/h) | 27.86 mph (44.84 km/h) |
| 35 mph (56.33 km/h) | 32.51 mph (52.32 km/h) |
| 40 mph (64.37 km/h) | 37.15 mph (59.79 km/h) |
| 45 mph (72.42 km/h) | 41.8 mph (67.26 km/h) |
| 50 mph (80.47 km/h) | 46.44 mph (74.74 km/h) |
| 55 mph (88.51 km/h) | 51.08 mph (82.21 km/h) |
| 60 mph (96.56 km/h) | 55.73 mph (89.68 km/h) |
| 65 mph (104.61 km/h) | 60.37 mph (97.16 km/h) |
| 70 mph (112.65 km/h) | 65.02 mph (104.63 km/h) |
| 75 mph (120.7 km/h) | 69.66 mph (112.11 km/h) |
| 80 mph (128.75 km/h) | 74.3 mph (119.58 km/h) |
| 85 mph (136.79 km/h) | 78.95 mph (127.05 km/h) |
| 90 mph (144.84 km/h) | 83.59 mph (134.53 km/h) |
| 95 mph (152.89 km/h) | 88.24 mph (142 km/h) |
| 100 mph (160.93 km/h) | 92.88 mph (149.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1967 | 2286 | 2461 | 2570 | 2687 | 2771 | 2863 | 2972 | 3123 | 3273 | 3441 | 3575 | 3818 | 4086 | 4295 | 4429 | 4504 | 4780 | 5166 | 6003 |
Better Fuel Economy Factory Ratios Increased Power
