Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 100/90-21 | 120/90-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.09 (713.4) | 27.5 (698.6) | -0.58 (-14.8) -2.1% |
| Width inches (mm) | 3.94 (100) | 4.72 (120) | 0.79 (20) 20% |
| Circum. inches (mm) | 88.24 (2241.21) | 86.41 (2194.72) | -1.83 (-46.5) -2.1% |
| Sidewall Height inches (mm) | 3.54 (90) | 4.25 (108) | 0.71 (18) 20% |
| Revolutions per mile (km) | 718.07 (446.19) | 733.28 (455.64) | 15.21 (9.45) 2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.59 mph (31.52 km/h) |
| 25 mph (40.23 km/h) | 24.48 mph (39.4 km/h) |
| 30 mph (48.28 km/h) | 29.38 mph (47.28 km/h) |
| 35 mph (56.33 km/h) | 34.27 mph (55.16 km/h) |
| 40 mph (64.37 km/h) | 39.17 mph (63.04 km/h) |
| 45 mph (72.42 km/h) | 44.07 mph (70.92 km/h) |
| 50 mph (80.47 km/h) | 48.96 mph (78.8 km/h) |
| 55 mph (88.51 km/h) | 53.86 mph (86.68 km/h) |
| 60 mph (96.56 km/h) | 58.76 mph (94.56 km/h) |
| 65 mph (104.61 km/h) | 63.65 mph (102.44 km/h) |
| 70 mph (112.65 km/h) | 68.55 mph (110.32 km/h) |
| 75 mph (120.7 km/h) | 73.44 mph (118.2 km/h) |
| 80 mph (128.75 km/h) | 78.34 mph (126.08 km/h) |
| 85 mph (136.79 km/h) | 83.24 mph (133.96 km/h) |
| 90 mph (144.84 km/h) | 88.13 mph (141.84 km/h) |
| 95 mph (152.89 km/h) | 93.03 mph (149.72 km/h) |
| 100 mph (160.93 km/h) | 97.93 mph (157.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1866 | 2168 | 2335 | 2438 | 2549 | 2628 | 2716 | 2819 | 2962 | 3105 | 3264 | 3391 | 3621 | 3875 | 4074 | 4201 | 4272 | 4534 | 4899 | 5693 |
Better Fuel Economy Factory Ratios Increased Power
