Santana Travel Tandem, roughly a Medium​/​Small Front​/​Rear. Can adjust to fit most folks- I am 6'2" and it's slightly small on me and my partner is 5'3" and it's slightly large on her. Rides like a normal bike and comes apart to fit in two standard size checked bags with backpack straps and room to spare! Takes about 30min-1hr to setup​/​breakdown. Can breakdown the bike for you into the bags on request! 26"x1.75" wheels, 3x8 Shimano mtb-style gearing.