Features catalogs of bicycle parts, accessories, and tandem bicycles. Also offers a variety of cycling related products.

Offers a complete line of tandem bikes, tandem accessories, special parts, and frame materials.

Official website of Spencer Beard, Sheila Hoffman, and the S2Cycling team. Presents photos, rider profiles, and contacts.

Online tandem bicycle information source offering pictures, information on tandem types and accessories, and links to related websites.

Provides information on membership, upcoming events, and rides and rallies. Includes classifieds and bulletins.