Considering the relationship between crank length and saddle height, its surprising that the conventional wisdom is so often repeated without scrutiny. The assumption that a 155mm crank will necessitate a saddle height adjustment is based on a simplistic view of the biomechanics at play.
If we accept that the primary factor influencing saddle height is the riders inseam, then it stands to reason that crank length should have a negligible impact on this measurement. After all, the distance between the center of the bottom bracket and the top of the saddle is determined by the riders leg length, not the crank length.
Furthermore, the notion that a longer crank will result in a higher saddle height is predicated on the idea that the rider will be forced to adopt a more upright position to accommodate the increased crank length. However, this ignores the fact that riders often adjust their position on the bike to suit their individual preferences and riding styles.
Given the complexities of human anatomy and the myriad ways in which riders interact with their bikes, its surprising that the relationship between crank length and saddle height is so often oversimplified. Rather than relying on anecdotal evidence or general guidelines, shouldnt we be looking at the empirical data to inform our understanding of this relationship?
In light of these considerations, the question remains: will a 155mm crank truly necessitate a saddle height adjustment, or is this simply a myth perpetuated by conventional wisdom?