Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 100/90-21 | 70/100-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.09 (713.4) | 26.51 (673.4) | -1.57 (-40) -5.6% |
| Width inches (mm) | 3.94 (100) | 2.76 (70) | -1.18 (-30) -30% |
| Circum. inches (mm) | 88.24 (2241.21) | 83.29 (2115.55) | -4.95 (-125.66) -5.6% |
| Sidewall Height inches (mm) | 3.54 (90) | 2.76 (70) | -0.79 (-20) -22.2% |
| Revolutions per mile (km) | 718.07 (446.19) | 760.72 (472.69) | 42.65 (26.5) 5.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.88 mph (30.38 km/h) |
| 25 mph (40.23 km/h) | 23.6 mph (37.98 km/h) |
| 30 mph (48.28 km/h) | 28.32 mph (45.57 km/h) |
| 35 mph (56.33 km/h) | 33.04 mph (53.17 km/h) |
| 40 mph (64.37 km/h) | 37.76 mph (60.76 km/h) |
| 45 mph (72.42 km/h) | 42.48 mph (68.36 km/h) |
| 50 mph (80.47 km/h) | 47.2 mph (75.96 km/h) |
| 55 mph (88.51 km/h) | 51.92 mph (83.55 km/h) |
| 60 mph (96.56 km/h) | 56.64 mph (91.15 km/h) |
| 65 mph (104.61 km/h) | 61.36 mph (98.74 km/h) |
| 70 mph (112.65 km/h) | 66.08 mph (106.34 km/h) |
| 75 mph (120.7 km/h) | 70.79 mph (113.93 km/h) |
| 80 mph (128.75 km/h) | 75.51 mph (121.53 km/h) |
| 85 mph (136.79 km/h) | 80.23 mph (129.12 km/h) |
| 90 mph (144.84 km/h) | 84.95 mph (136.72 km/h) |
| 95 mph (152.89 km/h) | 89.67 mph (144.32 km/h) |
| 100 mph (160.93 km/h) | 94.39 mph (151.91 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
