TerraTrike offers a webpage concerning how to determine your X-seam. X-seam is a measurement similar to inseam which is used to determine how to adjust the boom properly to fit the rider of a tadpole trike. When seated properly on a tadpole trike the rider’s leg should be about 85 % fully extended when the pedal is rotated to its most forward position.
I have written about this subject previously. HERE is one of the articles.
I have noticed that the instructions given for this vary somewhat in the matter of how much distance the bottom of the board is out away from the wall. To my way of thinking the safest and best method would be to duplicate the seat back angle more so than a measurement off of the wall. Of course, one must be careful not to move the board while sitting down and going thru the process of obtaining the measurement.
A quick and easy way to adjust the boom to its proper position for the rider is simply to sit in the seat and place the “heel” of the foot (while wearing shoes) on the pedal in the furthest forward position. The boom can then be tightened down and when the balls of the rider’s feet are positioned on the pedals the legs should be about 85 % or so extended.
It is good to know our X-seam measurement as it can be of value for a mechanic to set up a trike for the rider without them being there to go thru this process. Having a trike set up properly helps us to …
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