Yakima SideWinder Tandem Fork Mount Rooftop Bicycle Carrier Swing-out arm allows one person to load a bicycle for two Simple, tool-free installation to Yakima round or square crossbars Holds tandems more securely than wheel-tray designs including padded boom cradle and quick-release straps protect bottom-mounted cables Yakima SKS Lock core sold separately Love it 'Till You Leave It Limited Lifetime Warranty.