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Choosing the correct size for a Specialized Roubaix bike is crucial for comfort and performance, and Specialized offers its most expansize size range with the Roubaix. The sizes available range from 44cm to 64cm, depending on the model year, with the 2021 model offering sizes up to 61cm and the 2022 model including a 64cm option​​​​. To find the most suitable size, start with your height. 

As a general rule of thumb rider height correlates well to suggested bike size. For instance, if you are 5 feet 10 inches tall (178 cm), a medium frame size of 54cm is recommended. However, it's important to note that this guide is a starting point, as limb length and torso size can significantly affect the ideal bike size for an individual​​.