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Based on rider feedback for Topstone, while official sizing charts are a good starting point, they consider only height. There are other important factors include inseam, arm length, and riding style. Some customers recommend comparing measurements of a current bike that fits well to the Topstone's specifications, and to err on the side of a smaller size if in doubt, as adjustments can be made with stem and seat post. 

Trying out different sizes at a bike shop is one way to find the perfect fit, as personal comfort and riding style play significant roles. We recommend going a size smaller than what Cannondale suggests, but note that some have found the Cannondale sizing to be accurate. Riders with longer torsos may do better in a larger size. Again ultimately, if you're struggling with Topstone sizing, the best way to determine the right size is to test ride the bike.