Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/45-21 | 255/50-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.39 (771.9) | 31.04 (788.4) | 0.65 (16.5) 2.1% |
| Width inches (mm) | 10.43 (265) | 10.04 (255) | -0.39 (-10) -3.8% |
| Circum. inches (mm) | 95.47 (2425) | 97.51 (2476.83) | 2.04 (51.84) 2.1% |
| Sidewall Height inches (mm) | 4.69 (119.25) | 5.02 (127.5) | 0.32 (8.25) 6.9% |
| Revolutions per mile (km) | 663.65 (412.37) | 649.76 (403.74) | -13.89 (-8.63) -2.1% |
255/50-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.43 mph (32.87 km/h) |
| 25 mph (40.23 km/h) | 25.53 mph (41.09 km/h) |
| 30 mph (48.28 km/h) | 30.64 mph (49.31 km/h) |
| 35 mph (56.33 km/h) | 35.75 mph (57.53 km/h) |
| 40 mph (64.37 km/h) | 40.86 mph (65.75 km/h) |
| 45 mph (72.42 km/h) | 45.96 mph (73.97 km/h) |
| 50 mph (80.47 km/h) | 51.07 mph (82.19 km/h) |
| 55 mph (88.51 km/h) | 56.18 mph (90.41 km/h) |
| 60 mph (96.56 km/h) | 61.28 mph (98.62 km/h) |
| 65 mph (104.61 km/h) | 66.39 mph (106.84 km/h) |
| 70 mph (112.65 km/h) | 71.5 mph (115.06 km/h) |
| 75 mph (120.7 km/h) | 76.6 mph (123.28 km/h) |
| 80 mph (128.75 km/h) | 81.71 mph (131.5 km/h) |
| 85 mph (136.79 km/h) | 86.82 mph (139.72 km/h) |
| 90 mph (144.84 km/h) | 91.92 mph (147.94 km/h) |
| 95 mph (152.89 km/h) | 97.03 mph (156.16 km/h) |
| 100 mph (160.93 km/h) | 102.14 mph (164.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1654 | 1921 | 2069 | 2160 | 2259 | 2329 | 2406 | 2498 | 2625 | 2751 | 2892 | 3004 | 3209 | 3434 | 3610 | 3722 | 3785 | 4018 | 4341 | 5045 |
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