Here's a toast to cheap.
Rumor has it that this German person named 'Norbert' made this rig under 50 euros (ha!). Not only did he make all the servomotor associated shifting mechanism himself, he also built the aero bike from bottom up including the wheels.
Pay close attention to this servo setup. Here are the pics, obtained from WW Forum. Credits to you guys out there.
Norbert. One question. When will you start your cycling company? :)
Please read about how he made this setup in Part II.