Originally Posted by
Mr. Beanz
I've read the FX is the same fram as the Pilot but with wider tires.
I just looked at the Trek site, the Pilot doesn't come with the same frame. Except at entry level , they are both Alpha SL Aluminum. I am not sure if the geometry is similar with some models without delving into it deeper. As far as I can tell from a quick glance at specs, Pilot frame doesn't have rack and fender mounts.
If getting a bike for fitness and/or recreation reasons, a Pilot might work tho, so perhaps test riding both the FX and Pilot would be a good idea.