Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/90-21 | 90/90-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.67 (677.4) | 25.38 (644.6) | -1.29 (-32.8) -4.8% |
| Width inches (mm) | 3.15 (80) | 3.54 (90) | 0.39 (10) 12.5% |
| Circum. inches (mm) | 83.78 (2128.11) | 79.73 (2025.07) | -4.06 (-103.04) -4.8% |
| Sidewall Height inches (mm) | 2.83 (72) | 3.19 (81) | 0.35 (9) 12.5% |
| Revolutions per mile (km) | 756.23 (469.9) | 794.71 (493.81) | 38.48 (23.91) 5.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.03 mph (30.63 km/h) |
| 25 mph (40.23 km/h) | 23.79 mph (38.29 km/h) |
| 30 mph (48.28 km/h) | 28.55 mph (45.94 km/h) |
| 35 mph (56.33 km/h) | 33.31 mph (53.6 km/h) |
| 40 mph (64.37 km/h) | 38.06 mph (61.26 km/h) |
| 45 mph (72.42 km/h) | 42.82 mph (68.91 km/h) |
| 50 mph (80.47 km/h) | 47.58 mph (76.57 km/h) |
| 55 mph (88.51 km/h) | 52.34 mph (84.23 km/h) |
| 60 mph (96.56 km/h) | 57.09 mph (91.89 km/h) |
| 65 mph (104.61 km/h) | 61.85 mph (99.54 km/h) |
| 70 mph (112.65 km/h) | 66.61 mph (107.2 km/h) |
| 75 mph (120.7 km/h) | 71.37 mph (114.86 km/h) |
| 80 mph (128.75 km/h) | 76.13 mph (122.51 km/h) |
| 85 mph (136.79 km/h) | 80.88 mph (130.17 km/h) |
| 90 mph (144.84 km/h) | 85.64 mph (137.83 km/h) |
| 95 mph (152.89 km/h) | 90.4 mph (145.49 km/h) |
| 100 mph (160.93 km/h) | 95.16 mph (153.14 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022 | 2349 | 2530 | 2642 | 2762 | 2849 | 2943 | 3055 | 3210 | 3365 | 3537 | 3675 | 3924 | 4200 | 4415 | 4553 | 4630 | 4914 | 5310 | 6170 |
Better Fuel Economy Factory Ratios Increased Power
