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Rider anatomy - legs

Hi Brent,

With regard to measurements L1, L2, and L3, is L1 is from the bump on the outside of the knee to, where -- an anatomical landmark on the hip or something more visual?  How about L2: knee bump to bone that sticks out on the ankle (base of fibula?). L3: base of fibula to bottom of shoe heel?


Legs in rider anatomy

First thing I should make clear is that the representation of the rider that is dependant on these dimensions is of no consequence to the frame geometry recommendations made by the Fit advisor. This is discussed at: bikecad.ca/rider_anatomy_tabs. The representation of the rider is only there as a tool for you to visualize the rider on the bike and apply your own judgments about how such a rider might fit on the bicycle in question. As such, L1, L2 and L3 can be used by different fitters in different ways. If you choose to measure between anatomical landmarks, your processes will likely be more repeatable. On the other hand, you may also want to measure to a spot that may seem to better represent the center of the hip or knee joint. Of course, hips and knees are not in reality pin joints as they are idealized to be here. Therefore, when measuring to what you deem to be the center of the joint, just be aware of the small margin of error due to human joints being more complex than simple pin joints.

Thanks, Brent -- that helps.

Thanks, Brent -- that helps.

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