Top tube length is measured from the center of the head tube and top tube junction to the center line of the seat tube, parallel to the ground. Due to sloping top tubes, the physical length may be different from the effective top tube length given

유효탑튜브길이라는건지 아니면 유효탑튜브길이와 다르다는건지 구분이 안돼서 올립니다
번역부탁드립니다

제키가 170인데 c-c15.5인치 Effective Top Tube 22.3이면 맞을까요??