How does a Rear Derailleur work?. Doppelganger Japanese Folding Bicycle - HD

View of a Shimano 7-speed Rear Derailleur mated with a Shimano Revoshift shifter on my daughter's bicycle. She was too big for a kid's sized bicycle so we got her this one which was perfect in size to grow up into. Total length - 1500 mm Weight - 14.2 Kg Frame material - Aluminum Derailleur - Shimano 6 Speed Frame color - [Two tone] Leyte White (Leyte White) × Cream Gray (Grey Cream) http://www.youtube.com/embed/t4hmTFxqKto?autoplay=1 https://www.flickr.com/search/?w=100640170@N05&q=DOPPELGANGER