Bikes are supported by the wheel, not the frame. * Adjustable to fit both adult and kids bike sizes. * Carry multiple bike styles at the same time. * Lightweight aluminum support arms. * Quick release cradle and wheel straps. * Removable support arms for compact storage. * Easy to assemble. * Wheel and pedal straps reduce bike sway. * Durable powder coated steel shank. * 1-1/4" square receiver mount with 2" square receiver adapter.