Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/30-21 | 255/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.26 (692.4) | 27.02 (686.4) | -0.24 (-6) -0.9% |
| Width inches (mm) | 10.43 (265) | 10.04 (255) | -0.39 (-10) -3.8% |
| Circum. inches (mm) | 85.64 (2175.24) | 84.9 (2156.39) | -0.74 (-18.85) -0.9% |
| Sidewall Height inches (mm) | 3.13 (79.5) | 3.01 (76.5) | -0.12 (-3) -3.8% |
| Revolutions per mile (km) | 739.85 (459.72) | 746.31 (463.74) | 6.47 (4.02) 0.9% |
255/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.83 mph (31.91 km/h) |
| 25 mph (40.23 km/h) | 24.78 mph (39.89 km/h) |
| 30 mph (48.28 km/h) | 29.74 mph (47.86 km/h) |
| 35 mph (56.33 km/h) | 34.7 mph (55.84 km/h) |
| 40 mph (64.37 km/h) | 39.65 mph (63.82 km/h) |
| 45 mph (72.42 km/h) | 44.61 mph (71.79 km/h) |
| 50 mph (80.47 km/h) | 49.57 mph (79.77 km/h) |
| 55 mph (88.51 km/h) | 54.52 mph (87.75 km/h) |
| 60 mph (96.56 km/h) | 59.48 mph (95.72 km/h) |
| 65 mph (104.61 km/h) | 64.44 mph (103.7 km/h) |
| 70 mph (112.65 km/h) | 69.39 mph (111.68 km/h) |
| 75 mph (120.7 km/h) | 74.35 mph (119.66 km/h) |
| 80 mph (128.75 km/h) | 79.31 mph (127.63 km/h) |
| 85 mph (136.79 km/h) | 84.26 mph (135.61 km/h) |
| 90 mph (144.84 km/h) | 89.22 mph (143.59 km/h) |
| 95 mph (152.89 km/h) | 94.18 mph (151.56 km/h) |
| 100 mph (160.93 km/h) | 99.13 mph (159.54 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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