Fahrradsozialismus

A somewhat less sophisticated online bike building interface than BikeCAD, but it is fun nonetheless, and being Japanese, you’re practically guaranteed some delightful wackiness.

Just in case you get hungry on the way:

A fully featured Java applet that allows you to design your own bike.

Here’s one monstrosity of a Farthing-Penny I knocked up earlier, giving you a pedestrian 9381.9 gear-inches, meaning that for a leisurely cadence of 60 rpm you’d be travelling at a sauntering 2120.6 kph (just under Mach 2) - if you’re superman on steroids.