I've tried seaching for the answer to this and cannot find confirmation. Competitivecyclist has a possible reference to the bible below..

..Apparently, a fad with professional Italian soccer players right now is to display an abbreviated version of a bible verse on their uniforms, and apparently "F4:13" is related to that trend.... .... It's Philippians 4:13, which reads "I can do all things through Christ who gives me strength."

But with the release of F3:13 it appears that these are bikes in a series....?

Does anyone know the true origin of the name?

Philippians 3:13 ; press on toward the goal to win the prize for wich god has called me heavenward in JC.

I can see where this works too.

Italian soccer playes have frequently quoted the biblical reference F4:13.

I've seen that reference on competitive cyclist, but I was curious if anyone knows for sure....