Hi Stephan 

there's a shop called SOLD sports in Carouge (email : www.sold-sports.ch) !  they sell used bikes, skis, and all gear & clothing! Everything is 2nd hand and sold on the principal of dépot-vente with private sale : the shop owner sells for the client & keeps a %age of the sale. Ive sold several bikes & several skis-boots over the years with them. I  have never bought with them, however they only take new-good condition equipement & when in the shop they have a interesting stuff. 

Hope it works out for you!  

Thanks lily - I was wondering exactly the same thing.. : )

thanks lily, i'll check it out today!

the website looks great, it seems that have bikes of all types.

stephen