We have a pair of Penninger Voyager Tandem Recumbent Bikes. They are in excellent condition (near mint) and can be used individually or attached to assist a second rider to pedal and exercise without steering. Each recumbent has 8 x 8 Sram shifters, 64 gears and is 6 foot 8" long and the rear frame is 29" wide including the wheels. The square padded seat is 13" x 9" and 3 1/2" thick. The back seat support is 17" wide x 23" tall and can be adjusted forward and back.