Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-21 | 285/60-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.04 (788.4) | 34.46 (875.4) | 3.43 (87) 11% |
| Width inches (mm) | 10.04 (255) | 11.22 (285) | 1.18 (30) 11.8% |
| Circum. inches (mm) | 97.51 (2476.83) | 108.27 (2750.15) | 10.76 (273.32) 11% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 6.73 (171) | 1.71 (43.5) 34.1% |
| Revolutions per mile (km) | 649.76 (403.74) | 585.18 (363.62) | -64.58 (-40.13) -9.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.21 mph (35.74 km/h) |
| 25 mph (40.23 km/h) | 27.76 mph (44.67 km/h) |
| 30 mph (48.28 km/h) | 33.31 mph (53.61 km/h) |
| 35 mph (56.33 km/h) | 38.86 mph (62.54 km/h) |
| 40 mph (64.37 km/h) | 44.41 mph (71.48 km/h) |
| 45 mph (72.42 km/h) | 49.97 mph (80.41 km/h) |
| 50 mph (80.47 km/h) | 55.52 mph (89.35 km/h) |
| 55 mph (88.51 km/h) | 61.07 mph (98.28 km/h) |
| 60 mph (96.56 km/h) | 66.62 mph (107.22 km/h) |
| 65 mph (104.61 km/h) | 72.17 mph (116.15 km/h) |
| 70 mph (112.65 km/h) | 77.72 mph (125.09 km/h) |
| 75 mph (120.7 km/h) | 83.28 mph (134.02 km/h) |
| 80 mph (128.75 km/h) | 88.83 mph (142.96 km/h) |
| 85 mph (136.79 km/h) | 94.38 mph (151.89 km/h) |
| 90 mph (144.84 km/h) | 99.93 mph (160.82 km/h) |
| 95 mph (152.89 km/h) | 105.48 mph (169.76 km/h) |
| 100 mph (160.93 km/h) | 111.04 mph (178.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1489 | 1730 | 1863 | 1945 | 2034 | 2098 | 2167 | 2250 | 2364 | 2478 | 2604 | 2706 | 2890 | 3092 | 3251 | 3352 | 3409 | 3618 | 3910 | 4544 |
Better Fuel Economy Factory Ratios Increased Power
