Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/45-20 | 255/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.74 (755.5) | 29.04 (737.7) | -0.7 (-17.8) -2.4% |
| Width inches (mm) | 10.83 (275) | 10.04 (255) | -0.79 (-20) -7.3% |
| Circum. inches (mm) | 93.44 (2373.47) | 91.24 (2317.55) | -2.2 (-55.92) -2.4% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 5.52 (140.25) | 0.65 (16.5) 13.3% |
| Revolutions per mile (km) | 678.05 (421.32) | 694.42 (431.49) | 16.36 (10.17) 2.4% |
255/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.53 mph (31.43 km/h) |
| 25 mph (40.23 km/h) | 24.41 mph (39.29 km/h) |
| 30 mph (48.28 km/h) | 29.29 mph (47.14 km/h) |
| 35 mph (56.33 km/h) | 34.18 mph (55 km/h) |
| 40 mph (64.37 km/h) | 39.06 mph (62.86 km/h) |
| 45 mph (72.42 km/h) | 43.94 mph (70.71 km/h) |
| 50 mph (80.47 km/h) | 48.82 mph (78.57 km/h) |
| 55 mph (88.51 km/h) | 53.7 mph (86.43 km/h) |
| 60 mph (96.56 km/h) | 58.59 mph (94.29 km/h) |
| 65 mph (104.61 km/h) | 63.47 mph (102.14 km/h) |
| 70 mph (112.65 km/h) | 68.35 mph (110 km/h) |
| 75 mph (120.7 km/h) | 73.23 mph (117.86 km/h) |
| 80 mph (128.75 km/h) | 78.12 mph (125.71 km/h) |
| 85 mph (136.79 km/h) | 83 mph (133.57 km/h) |
| 90 mph (144.84 km/h) | 87.88 mph (141.43 km/h) |
| 95 mph (152.89 km/h) | 92.76 mph (149.29 km/h) |
| 100 mph (160.93 km/h) | 97.64 mph (157.14 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1767 | 2053 | 2211 | 2309 | 2414 | 2489 | 2572 | 2670 | 2805 | 2940 | 3091 | 3211 | 3429 | 3670 | 3858 | 3978 | 4046 | 4294 | 4640 | 5392 |
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