i'm a french man so excuse me for my bad english
i must to build a quadricyle for my son who's aged to 5 years.
i want to make a system similar like this http://www.pedalcoupe.com/images/gallery/gears_t.jpg
i have a probleme with the freehub.
how i must to do, i want when the fixed gear turn the rear weels turning and when the crankset stop the rear wheel going to turn always?
how do you fix the rears wheels?
Have you some schematics or pictures or others things to help me.
i thank you in advance.