Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 90/90-21 | 140/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.38 (695.4) | 26.82 (681.2) | -0.56 (-14.2) -2% |
| Width inches (mm) | 3.54 (90) | 5.51 (140) | 1.97 (50) 55.6% |
| Circum. inches (mm) | 86.01 (2184.66) | 84.25 (2140.05) | -1.76 (-44.61) -2% |
| Sidewall Height inches (mm) | 3.19 (81) | 4.41 (112) | 1.22 (31) 38.3% |
| Revolutions per mile (km) | 736.66 (457.74) | 752.01 (467.28) | 15.36 (9.54) 2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.59 mph (31.53 km/h) |
| 25 mph (40.23 km/h) | 24.49 mph (39.41 km/h) |
| 30 mph (48.28 km/h) | 29.39 mph (47.29 km/h) |
| 35 mph (56.33 km/h) | 34.29 mph (55.18 km/h) |
| 40 mph (64.37 km/h) | 39.18 mph (63.06 km/h) |
| 45 mph (72.42 km/h) | 44.08 mph (70.94 km/h) |
| 50 mph (80.47 km/h) | 48.98 mph (78.82 km/h) |
| 55 mph (88.51 km/h) | 53.88 mph (86.71 km/h) |
| 60 mph (96.56 km/h) | 58.77 mph (94.59 km/h) |
| 65 mph (104.61 km/h) | 63.67 mph (102.47 km/h) |
| 70 mph (112.65 km/h) | 68.57 mph (110.35 km/h) |
| 75 mph (120.7 km/h) | 73.47 mph (118.24 km/h) |
| 80 mph (128.75 km/h) | 78.37 mph (126.12 km/h) |
| 85 mph (136.79 km/h) | 83.26 mph (134 km/h) |
| 90 mph (144.84 km/h) | 88.16 mph (141.88 km/h) |
| 95 mph (152.89 km/h) | 93.06 mph (149.77 km/h) |
| 100 mph (160.93 km/h) | 97.96 mph (157.65 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1914 | 2223 | 2394 | 2500 | 2614 | 2696 | 2785 | 2891 | 3038 | 3184 | 3347 | 3477 | 3713 | 3974 | 4178 | 4308 | 4381 | 4650 | 5025 | 5839 |
Better Fuel Economy Factory Ratios Increased Power
