Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 275/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 26.5 (673) | -0.9 (-22.9) -3.3% |
| Width inches (mm) | 12.8 (325) | 10.83 (275) | -1.97 (-50) -15.4% |
| Circum. inches (mm) | 86.07 (2186.23) | 83.24 (2114.29) | -2.83 (-71.94) -3.3% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 3.25 (82.5) | 0.05 (1.25) 1.5% |
| Revolutions per mile (km) | 736.13 (457.41) | 761.17 (472.97) | 25.05 (15.56) 3.4% |
275/30-20 Tires
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) | 48.35 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 (140.07 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1937 | 2250 | 2423 | 2531 | 2646 | 2728 | 2819 | 2926 | 3075 | 3223 | 3388 | 3520 | 3759 | 4022 | 4229 | 4360 | 4435 | 4707 | 5086 | 5910 |
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