Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/100-21 | 120/100-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.3 (693.4) | 30.45 (773.4) | 3.15 (80) 11.5% |
| Width inches (mm) | 3.15 (80) | 4.72 (120) | 1.57 (40) 50% |
| Circum. inches (mm) | 85.76 (2178.38) | 95.66 (2429.71) | 9.89 (251.33) 11.5% |
| Sidewall Height inches (mm) | 3.15 (80) | 4.72 (120) | 1.57 (40) 50% |
| Revolutions per mile (km) | 738.78 (459.06) | 662.36 (411.57) | -76.42 (-47.48) -10.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.31 mph (35.9 km/h) |
| 25 mph (40.23 km/h) | 27.88 mph (44.88 km/h) |
| 30 mph (48.28 km/h) | 33.46 mph (53.85 km/h) |
| 35 mph (56.33 km/h) | 39.04 mph (62.83 km/h) |
| 40 mph (64.37 km/h) | 44.61 mph (71.8 km/h) |
| 45 mph (72.42 km/h) | 50.19 mph (80.78 km/h) |
| 50 mph (80.47 km/h) | 55.77 mph (89.75 km/h) |
| 55 mph (88.51 km/h) | 61.35 mph (98.73 km/h) |
| 60 mph (96.56 km/h) | 66.92 mph (107.7 km/h) |
| 65 mph (104.61 km/h) | 72.5 mph (116.68 km/h) |
| 70 mph (112.65 km/h) | 78.08 mph (125.65 km/h) |
| 75 mph (120.7 km/h) | 83.65 mph (134.63 km/h) |
| 80 mph (128.75 km/h) | 89.23 mph (143.6 km/h) |
| 85 mph (136.79 km/h) | 94.81 mph (152.58 km/h) |
| 90 mph (144.84 km/h) | 100.38 mph (161.55 km/h) |
| 95 mph (152.89 km/h) | 105.96 mph (170.53 km/h) |
| 100 mph (160.93 km/h) | 111.54 mph (179.5 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1686 | 1958 | 2109 | 2202 | 2302 | 2374 | 2453 | 2546 | 2675 | 2805 | 2948 | 3063 | 3271 | 3500 | 3680 | 3794 | 3859 | 4096 | 4426 | 5143 |
Better Fuel Economy Factory Ratios Increased Power
