Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/100-21 | 110/100-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.3 (693.4) | 26.66 (677.2) | -0.64 (-16.2) -2.3% |
| Width inches (mm) | 3.15 (80) | 4.33 (110) | 1.18 (30) 37.5% |
| Circum. inches (mm) | 85.76 (2178.38) | 83.76 (2127.49) | -2 (-50.89) -2.3% |
| Sidewall Height inches (mm) | 3.15 (80) | 4.33 (110) | 1.18 (30) 37.5% |
| Revolutions per mile (km) | 738.78 (459.06) | 756.45 (470.04) | 17.67 (10.98) 2.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.53 mph (31.43 km/h) |
| 25 mph (40.23 km/h) | 24.42 mph (39.29 km/h) |
| 30 mph (48.28 km/h) | 29.3 mph (47.15 km/h) |
| 35 mph (56.33 km/h) | 34.18 mph (55.01 km/h) |
| 40 mph (64.37 km/h) | 39.07 mph (62.87 km/h) |
| 45 mph (72.42 km/h) | 43.95 mph (70.73 km/h) |
| 50 mph (80.47 km/h) | 48.83 mph (78.59 km/h) |
| 55 mph (88.51 km/h) | 53.72 mph (86.45 km/h) |
| 60 mph (96.56 km/h) | 58.6 mph (94.3 km/h) |
| 65 mph (104.61 km/h) | 63.48 mph (102.16 km/h) |
| 70 mph (112.65 km/h) | 68.36 mph (110.02 km/h) |
| 75 mph (120.7 km/h) | 73.25 mph (117.88 km/h) |
| 80 mph (128.75 km/h) | 78.13 mph (125.74 km/h) |
| 85 mph (136.79 km/h) | 83.01 mph (133.6 km/h) |
| 90 mph (144.84 km/h) | 87.9 mph (141.46 km/h) |
| 95 mph (152.89 km/h) | 92.78 mph (149.32 km/h) |
| 100 mph (160.93 km/h) | 97.66 mph (157.17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1925 | 2236 | 2408 | 2515 | 2630 | 2711 | 2802 | 2908 | 3055 | 3203 | 3367 | 3498 | 3735 | 3998 | 4202 | 4333 | 4407 | 4677 | 5054 | 5873 |
Better Fuel Economy Factory Ratios Increased Power
