Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/60-18 | 255/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.57 (751.2) | 31.04 (788.5) | 1.47 (37.3) 5% |
| Width inches (mm) | 9.65 (245) | 10.04 (255) | 0.39 (10) 4.1% |
| Circum. inches (mm) | 92.91 (2359.96) | 97.53 (2477.15) | 4.61 (117.18) 5% |
| Sidewall Height inches (mm) | 5.79 (147) | 5.52 (140.25) | -0.27 (-6.75) -4.6% |
| Revolutions per mile (km) | 681.94 (423.73) | 649.68 (403.69) | -32.26 (-20.04) -4.7% |
255/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.99 mph (33.79 km/h) |
| 25 mph (40.23 km/h) | 26.24 mph (42.23 km/h) |
| 30 mph (48.28 km/h) | 31.49 mph (50.68 km/h) |
| 35 mph (56.33 km/h) | 36.74 mph (59.12 km/h) |
| 40 mph (64.37 km/h) | 41.99 mph (67.57 km/h) |
| 45 mph (72.42 km/h) | 47.23 mph (76.02 km/h) |
| 50 mph (80.47 km/h) | 52.48 mph (84.46 km/h) |
| 55 mph (88.51 km/h) | 57.73 mph (92.91 km/h) |
| 60 mph (96.56 km/h) | 62.98 mph (101.36 km/h) |
| 65 mph (104.61 km/h) | 68.23 mph (109.8 km/h) |
| 70 mph (112.65 km/h) | 73.48 mph (118.25 km/h) |
| 75 mph (120.7 km/h) | 78.72 mph (126.69 km/h) |
| 80 mph (128.75 km/h) | 83.97 mph (135.14 km/h) |
| 85 mph (136.79 km/h) | 89.22 mph (143.59 km/h) |
| 90 mph (144.84 km/h) | 94.47 mph (152.03 km/h) |
| 95 mph (152.89 km/h) | 99.72 mph (160.48 km/h) |
| 100 mph (160.93 km/h) | 104.97 mph (168.93 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1653 | 1921 | 2068 | 2160 | 2258 | 2329 | 2406 | 2498 | 2624 | 2751 | 2892 | 3004 | 3208 | 3433 | 3609 | 3722 | 3785 | 4017 | 4341 | 5044 |
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