Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 90/90-21 | 100/100-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.38 (695.4) | 28.87 (733.4) | 1.5 (38) 5.5% |
| Width inches (mm) | 3.54 (90) | 3.94 (100) | 0.39 (10) 11.1% |
| Circum. inches (mm) | 86.01 (2184.66) | 90.71 (2304.04) | 4.7 (119.38) 5.5% |
| Sidewall Height inches (mm) | 3.19 (81) | 3.94 (100) | 0.75 (19) 23.5% |
| Revolutions per mile (km) | 736.66 (457.74) | 698.49 (434.02) | -38.17 (-23.72) -5.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.09 mph (33.95 km/h) |
| 25 mph (40.23 km/h) | 26.37 mph (42.43 km/h) |
| 30 mph (48.28 km/h) | 31.64 mph (50.92 km/h) |
| 35 mph (56.33 km/h) | 36.91 mph (59.41 km/h) |
| 40 mph (64.37 km/h) | 42.19 mph (67.89 km/h) |
| 45 mph (72.42 km/h) | 47.46 mph (76.38 km/h) |
| 50 mph (80.47 km/h) | 52.73 mph (84.86 km/h) |
| 55 mph (88.51 km/h) | 58.01 mph (93.35 km/h) |
| 60 mph (96.56 km/h) | 63.28 mph (101.84 km/h) |
| 65 mph (104.61 km/h) | 68.55 mph (110.32 km/h) |
| 70 mph (112.65 km/h) | 73.83 mph (118.81 km/h) |
| 75 mph (120.7 km/h) | 79.1 mph (127.3 km/h) |
| 80 mph (128.75 km/h) | 84.37 mph (135.78 km/h) |
| 85 mph (136.79 km/h) | 89.64 mph (144.27 km/h) |
| 90 mph (144.84 km/h) | 94.92 mph (152.76 km/h) |
| 95 mph (152.89 km/h) | 100.19 mph (161.24 km/h) |
| 100 mph (160.93 km/h) | 105.46 mph (169.73 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1778 | 2065 | 2224 | 2322 | 2428 | 2504 | 2587 | 2685 | 2821 | 2957 | 3109 | 3230 | 3449 | 3691 | 3880 | 4001 | 4069 | 4319 | 4667 | 5423 |
Better Fuel Economy Factory Ratios Increased Power
