Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/90-21 | 70/100-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.67 (677.4) | 26.51 (673.4) | -0.16 (-4) -0.6% |
| Width inches (mm) | 3.15 (80) | 2.76 (70) | -0.39 (-10) -12.5% |
| Circum. inches (mm) | 83.78 (2128.11) | 83.29 (2115.55) | -0.49 (-12.57) -0.6% |
| Sidewall Height inches (mm) | 2.83 (72) | 2.76 (70) | -0.08 (-2) -2.8% |
| Revolutions per mile (km) | 756.23 (469.9) | 760.72 (472.69) | 4.49 (2.79) 0.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.88 mph (32 km/h) |
| 25 mph (40.23 km/h) | 24.85 mph (40 km/h) |
| 30 mph (48.28 km/h) | 29.82 mph (48 km/h) |
| 35 mph (56.33 km/h) | 34.79 mph (55.99 km/h) |
| 40 mph (64.37 km/h) | 39.76 mph (63.99 km/h) |
| 45 mph (72.42 km/h) | 44.73 mph (71.99 km/h) |
| 50 mph (80.47 km/h) | 49.7 mph (79.99 km/h) |
| 55 mph (88.51 km/h) | 54.68 mph (87.99 km/h) |
| 60 mph (96.56 km/h) | 59.65 mph (95.99 km/h) |
| 65 mph (104.61 km/h) | 64.62 mph (103.99 km/h) |
| 70 mph (112.65 km/h) | 69.59 mph (111.99 km/h) |
| 75 mph (120.7 km/h) | 74.56 mph (119.99 km/h) |
| 80 mph (128.75 km/h) | 79.53 mph (127.99 km/h) |
| 85 mph (136.79 km/h) | 84.5 mph (135.99 km/h) |
| 90 mph (144.84 km/h) | 89.47 mph (143.99 km/h) |
| 95 mph (152.89 km/h) | 94.44 mph (151.99 km/h) |
| 100 mph (160.93 km/h) | 99.41 mph (159.98 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
