Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-20 | 255/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.72 (704) | 31.04 (788.5) | 3.33 (84.5) 12% |
| Width inches (mm) | 9.65 (245) | 10.04 (255) | 0.39 (10) 4.1% |
| Circum. inches (mm) | 87.07 (2211.68) | 97.53 (2477.15) | 10.45 (265.46) 12% |
| Sidewall Height inches (mm) | 3.86 (98) | 5.52 (140.25) | 1.66 (42.25) 43.1% |
| Revolutions per mile (km) | 727.66 (452.14) | 649.68 (403.69) | -77.98 (-48.45) -10.7% |
255/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.4 mph (36.05 km/h) |
| 25 mph (40.23 km/h) | 28 mph (45.06 km/h) |
| 30 mph (48.28 km/h) | 33.6 mph (54.08 km/h) |
| 35 mph (56.33 km/h) | 39.2 mph (63.09 km/h) |
| 40 mph (64.37 km/h) | 44.8 mph (72.1 km/h) |
| 45 mph (72.42 km/h) | 50.4 mph (81.11 km/h) |
| 50 mph (80.47 km/h) | 56 mph (90.13 km/h) |
| 55 mph (88.51 km/h) | 61.6 mph (99.14 km/h) |
| 60 mph (96.56 km/h) | 67.2 mph (108.15 km/h) |
| 65 mph (104.61 km/h) | 72.8 mph (117.16 km/h) |
| 70 mph (112.65 km/h) | 78.4 mph (126.18 km/h) |
| 75 mph (120.7 km/h) | 84 mph (135.19 km/h) |
| 80 mph (128.75 km/h) | 89.6 mph (144.2 km/h) |
| 85 mph (136.79 km/h) | 95.2 mph (153.21 km/h) |
| 90 mph (144.84 km/h) | 100.8 mph (162.23 km/h) |
| 95 mph (152.89 km/h) | 106.4 mph (171.24 km/h) |
| 100 mph (160.93 km/h) | 112 mph (180.25 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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