Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 100/90-21 | 170/80-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.09 (713.4) | 25.71 (653) | -2.38 (-60.4) -8.5% |
| Width inches (mm) | 3.94 (100) | 6.69 (170) | 2.76 (70) 70% |
| Circum. inches (mm) | 88.24 (2241.21) | 80.77 (2051.46) | -7.47 (-189.75) -8.5% |
| Sidewall Height inches (mm) | 3.54 (90) | 5.35 (136) | 1.81 (46) 51.1% |
| Revolutions per mile (km) | 718.07 (446.19) | 784.49 (487.46) | 66.42 (41.27) 9.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.31 mph (29.46 km/h) |
| 25 mph (40.23 km/h) | 22.88 mph (36.83 km/h) |
| 30 mph (48.28 km/h) | 27.46 mph (44.19 km/h) |
| 35 mph (56.33 km/h) | 32.04 mph (51.56 km/h) |
| 40 mph (64.37 km/h) | 36.61 mph (58.92 km/h) |
| 45 mph (72.42 km/h) | 41.19 mph (66.29 km/h) |
| 50 mph (80.47 km/h) | 45.77 mph (73.65 km/h) |
| 55 mph (88.51 km/h) | 50.34 mph (81.02 km/h) |
| 60 mph (96.56 km/h) | 54.92 mph (88.39 km/h) |
| 65 mph (104.61 km/h) | 59.5 mph (95.75 km/h) |
| 70 mph (112.65 km/h) | 64.07 mph (103.12 km/h) |
| 75 mph (120.7 km/h) | 68.65 mph (110.48 km/h) |
| 80 mph (128.75 km/h) | 73.23 mph (117.85 km/h) |
| 85 mph (136.79 km/h) | 77.8 mph (125.21 km/h) |
| 90 mph (144.84 km/h) | 82.38 mph (132.58 km/h) |
| 95 mph (152.89 km/h) | 86.96 mph (139.94 km/h) |
| 100 mph (160.93 km/h) | 91.53 mph (147.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1996 | 2319 | 2498 | 2608 | 2727 | 2812 | 2905 | 3016 | 3169 | 3322 | 3492 | 3627 | 3874 | 4146 | 4358 | 4494 | 4570 | 4851 | 5242 | 6091 |
Better Fuel Economy Factory Ratios Increased Power
