Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 295/25-21 | 255/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.81 (680.9) | 27.02 (686.4) | 0.22 (5.5) 0.8% |
| Width inches (mm) | 11.61 (295) | 10.04 (255) | -1.57 (-40) -13.6% |
| Circum. inches (mm) | 84.22 (2139.11) | 84.9 (2156.39) | 0.68 (17.28) 0.8% |
| Sidewall Height inches (mm) | 2.9 (73.75) | 3.01 (76.5) | 0.11 (2.75) 3.7% |
| Revolutions per mile (km) | 752.34 (467.48) | 746.31 (463.74) | -6.03 (-3.75) -0.8% |
255/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.16 mph (32.45 km/h) |
| 25 mph (40.23 km/h) | 25.2 mph (40.56 km/h) |
| 30 mph (48.28 km/h) | 30.24 mph (48.67 km/h) |
| 35 mph (56.33 km/h) | 35.28 mph (56.78 km/h) |
| 40 mph (64.37 km/h) | 40.32 mph (64.89 km/h) |
| 45 mph (72.42 km/h) | 45.36 mph (73.01 km/h) |
| 50 mph (80.47 km/h) | 50.4 mph (81.12 km/h) |
| 55 mph (88.51 km/h) | 55.44 mph (89.23 km/h) |
| 60 mph (96.56 km/h) | 60.48 mph (97.34 km/h) |
| 65 mph (104.61 km/h) | 65.53 mph (105.45 km/h) |
| 70 mph (112.65 km/h) | 70.57 mph (113.56 km/h) |
| 75 mph (120.7 km/h) | 75.61 mph (121.68 km/h) |
| 80 mph (128.75 km/h) | 80.65 mph (129.79 km/h) |
| 85 mph (136.79 km/h) | 85.69 mph (137.9 km/h) |
| 90 mph (144.84 km/h) | 90.73 mph (146.01 km/h) |
| 95 mph (152.89 km/h) | 95.77 mph (154.12 km/h) |
| 100 mph (160.93 km/h) | 100.81 mph (162.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1899 | 2206 | 2376 | 2481 | 2594 | 2675 | 2764 | 2869 | 3015 | 3160 | 3322 | 3451 | 3685 | 3944 | 4146 | 4275 | 4348 | 4615 | 4986 | 5795 |
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