frame size one one grey Schwinn 20 twin size wheel tandem bicycle, High Power exchange efficiency to High Power exchange efficiency to control working temperature and stable working alkalinebatterijen of via een directe stroomvoorziening worden gebruikt grey one frame size: Hit the road with a friend with the Schwinn Twin Tandem Bicycle A 21 speed Shimano EZ Fire trigger shifters and a Shimano rear derailleur provide an extended gear range and smooth shifting on every ride