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Understanding the Increasing Complexity of Choosing the Right Bike and the Growing Importance of Bike-Sizing Today.
Frame sizing can vary between brands due to two main factors: Morphological Proportions: Cyclists with different body proportions, such as long legs and a short trunk or vice versa, may find a better fit with frames of varying sizes. This is why a cyclist of 1.80 meters could potentially ride a frame ranging from 54 to 58 (S-XL).