» Bilenky Tandems    Builders of performance and custom tandems. Product range, standard geometries, and color choices.    http://www.bilenky.com/tandems.html

» Da Vinci Designs    Handbuilt tandem bicycles with independent coasting drivetrain, from Colorado, USA. List of features and contact information.    http://davincitandems.com/

» Hollywood Bike    Manufacturer of a variety of single and twin tandem bikes. Thailand.    http://www.hollywoodbike.com

» Love Bike    Makes tandem bicycles and tandem bike child parent, and tandem mountain bikes. USA.    http://www.lovebike.com

» Santana Tandems    Makes premium, value, exotic, family, and custom tandems. Includes advice on traveling with a tandem, and a test to see if tandeming is for you.    http://www.santanatandem.com/

» The Granny Bike, quadcycle-PPV    The Granny Bike is a kit that converts two standard bicycles into a quadcycle. It can be used for, exercise, the physical challanged, recreational cycling, rental, and retirement communities.    http://www.thegrannybike.com/