Hollywood Bike - Manufacturer of a variety of single and twin tandem bikes. Thailand. - http://www.hollywoodbike.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/
Love Bike - Makes tandem bicycles and tandem bike child parent, and tandem mountain bikes. USA. - http://www.lovebike.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/
Da Vinci Designs - Handbuilt tandem bicycles with independent coasting drivetrain, from Colorado, USA. List of features and contact information. - http://davincitandems.com/
Bilenky Tandems - Builders of performance and custom tandems. Product range, standard geometries, and color choices. - http://www.bilenky.com/tandems.html