Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 90/90-21 | 120/90-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.38 (695.4) | 25.5 (647.8) | -1.87 (-47.6) -6.8% |
| Width inches (mm) | 3.54 (90) | 4.72 (120) | 1.18 (30) 33.3% |
| Circum. inches (mm) | 86.01 (2184.66) | 80.12 (2035.12) | -5.89 (-149.54) -6.8% |
| Sidewall Height inches (mm) | 3.19 (81) | 4.25 (108) | 1.06 (27) 33.3% |
| Revolutions per mile (km) | 736.66 (457.74) | 790.78 (491.37) | 54.13 (33.63) 7.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.63 mph (29.98 km/h) |
| 25 mph (40.23 km/h) | 23.29 mph (37.48 km/h) |
| 30 mph (48.28 km/h) | 27.95 mph (44.98 km/h) |
| 35 mph (56.33 km/h) | 32.6 mph (52.47 km/h) |
| 40 mph (64.37 km/h) | 37.26 mph (59.97 km/h) |
| 45 mph (72.42 km/h) | 41.92 mph (67.46 km/h) |
| 50 mph (80.47 km/h) | 46.58 mph (74.96 km/h) |
| 55 mph (88.51 km/h) | 51.24 mph (82.46 km/h) |
| 60 mph (96.56 km/h) | 55.89 mph (89.95 km/h) |
| 65 mph (104.61 km/h) | 60.55 mph (97.45 km/h) |
| 70 mph (112.65 km/h) | 65.21 mph (104.94 km/h) |
| 75 mph (120.7 km/h) | 69.87 mph (112.44 km/h) |
| 80 mph (128.75 km/h) | 74.52 mph (119.94 km/h) |
| 85 mph (136.79 km/h) | 79.18 mph (127.43 km/h) |
| 90 mph (144.84 km/h) | 83.84 mph (134.93 km/h) |
| 95 mph (152.89 km/h) | 88.5 mph (142.42 km/h) |
| 100 mph (160.93 km/h) | 93.16 mph (149.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2012 | 2338 | 2518 | 2629 | 2749 | 2834 | 2929 | 3040 | 3194 | 3348 | 3520 | 3657 | 3905 | 4179 | 4393 | 4530 | 4607 | 4890 | 5284 | 6140 |
Better Fuel Economy Factory Ratios Increased Power
