saharvey2

I am seeking input on child stokers and cadence. Recently when my 4 yr old daughter was on the back of our tandem, someone exclaimed, "look at her legs go." This raised a concern that the cadence was too high. I am interested in others experiences and whether and what type of injury risk there is.

My daughters inseam is 22".
The stokid cranks are 120 mm and are in-sync (i.e. 1:1).
She has swept back handlebars that provide an upright position.
My typical cadence is 100+ RPM's, but ride the tandem between 80-90 RPM's.