Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-21 | 275/50-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.91 (835.9) | 31.83 (808.4) | -1.08 (-27.5) -3.3% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 103.39 (2626.06) | 99.99 (2539.66) | -3.4 (-86.39) -3.3% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 5.41 (137.5) | -0.54 (-13.75) -9.1% |
| Revolutions per mile (km) | 612.84 (380.8) | 633.68 (393.75) | 20.85 (12.95) 3.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.34 mph (31.13 km/h) |
| 25 mph (40.23 km/h) | 24.18 mph (38.91 km/h) |
| 30 mph (48.28 km/h) | 29.01 mph (46.69 km/h) |
| 35 mph (56.33 km/h) | 33.85 mph (54.47 km/h) |
| 40 mph (64.37 km/h) | 38.68 mph (62.26 km/h) |
| 45 mph (72.42 km/h) | 43.52 mph (70.04 km/h) |
| 50 mph (80.47 km/h) | 48.36 mph (77.82 km/h) |
| 55 mph (88.51 km/h) | 53.19 mph (85.6 km/h) |
| 60 mph (96.56 km/h) | 58.03 mph (93.38 km/h) |
| 65 mph (104.61 km/h) | 62.86 mph (101.17 km/h) |
| 70 mph (112.65 km/h) | 67.7 mph (108.95 km/h) |
| 75 mph (120.7 km/h) | 72.53 mph (116.73 km/h) |
| 80 mph (128.75 km/h) | 77.37 mph (124.51 km/h) |
| 85 mph (136.79 km/h) | 82.2 mph (132.29 km/h) |
| 90 mph (144.84 km/h) | 87.04 mph (140.08 km/h) |
| 95 mph (152.89 km/h) | 91.87 mph (147.86 km/h) |
| 100 mph (160.93 km/h) | 96.71 mph (155.64 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1613 | 1873 | 2017 | 2107 | 2203 | 2271 | 2347 | 2436 | 2560 | 2683 | 2820 | 2930 | 3129 | 3349 | 3520 | 3630 | 3692 | 3918 | 4234 | 4920 |
Better Fuel Economy Factory Ratios Increased Power
