Abstract: A coupler for coupling two standard bicycles together to form a tandem tricycle. The coupler includes a clamp for clamping the coupler to one of the tines of the seat stays of the leading bicycle and further includes a quick release clamp for releasably gripping one of the tines of the front fork of the trailing bicycle. The quick release clamp is rotatable about a transverse axis relative to the clamp, so the trailing bicycle is likewise rotatable about a transverse axis relative to the leading bicycle. This permits the trailing bicycle to pitch independently of the leading bicycle, thereby allowing the two bicycles to smoothly traverse uneven terrain.