Hi there! We are new to tandems and wanted to touch base and see what everyone recommends for tires and tubes. I wanted to have some of both on hand and have no idea which ones to get - if some are better than others - and also where online to buy them! It seems that most products are more economical online. We are riding a 2007 Cannondale Road Tandem that has 700x28 Continental Ultra GatorSkin tires. Also - dumb question, but does that mean I need a 700x28 road tube? Thanks for your help!