Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/100-21 | 70/100-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.3 (693.4) | 26.51 (673.4) | -0.79 (-20) -2.9% |
| Width inches (mm) | 3.15 (80) | 2.76 (70) | -0.39 (-10) -12.5% |
| Circum. inches (mm) | 85.76 (2178.38) | 83.29 (2115.55) | -2.47 (-62.83) -2.9% |
| Sidewall Height inches (mm) | 3.15 (80) | 2.76 (70) | -0.39 (-10) -12.5% |
| Revolutions per mile (km) | 738.78 (459.06) | 760.72 (472.69) | 21.94 (13.63) 3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.42 mph (31.26 km/h) |
| 25 mph (40.23 km/h) | 24.28 mph (39.07 km/h) |
| 30 mph (48.28 km/h) | 29.13 mph (46.89 km/h) |
| 35 mph (56.33 km/h) | 33.99 mph (54.7 km/h) |
| 40 mph (64.37 km/h) | 38.85 mph (62.52 km/h) |
| 45 mph (72.42 km/h) | 43.7 mph (70.33 km/h) |
| 50 mph (80.47 km/h) | 48.56 mph (78.15 km/h) |
| 55 mph (88.51 km/h) | 53.41 mph (85.96 km/h) |
| 60 mph (96.56 km/h) | 58.27 mph (93.78 km/h) |
| 65 mph (104.61 km/h) | 63.13 mph (101.59 km/h) |
| 70 mph (112.65 km/h) | 67.98 mph (109.4 km/h) |
| 75 mph (120.7 km/h) | 72.84 mph (117.22 km/h) |
| 80 mph (128.75 km/h) | 77.69 mph (125.03 km/h) |
| 85 mph (136.79 km/h) | 82.55 mph (132.85 km/h) |
| 90 mph (144.84 km/h) | 87.4 mph (140.66 km/h) |
| 95 mph (152.89 km/h) | 92.26 mph (148.48 km/h) |
| 100 mph (160.93 km/h) | 97.12 mph (156.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1936 | 2249 | 2422 | 2529 | 2644 | 2727 | 2817 | 2924 | 3073 | 3221 | 3386 | 3518 | 3756 | 4020 | 4226 | 4358 | 4432 | 4704 | 5083 | 5907 |
Better Fuel Economy Factory Ratios Increased Power
