My wife is 5’0” and rides a 3XS Canyon. It fits her well, but gearing is the same as it would be for any larger, taller, other rider. Pedaling is about cadence and wheel speed. Match it up. If anything, her strength-to-weight ratio is amazing compared to big people. Clothing can be tricky. Black Bibs make sizes that truly fit her, so for anyone else seeking out good clothing in small sizes, give em a shot.