The Ciclotte Bike
https://www.youtube.com/watch?v=3KvsNyoD4PE&t=49s
Ciclotte Bike is the result of an aesthetic research inspired by ergonomics and essentiality and realized by using high-tech materials like carbon fibres, glass fibres and steel.
The iconic circular shape and the use of carbon express the bike’s strong sporting vocation, which is revealed during every training session.
The frame is designed to adapt to the 5 spinning positions.
The innovative turn multiplier transmission and the rotation of the outer wheel make the exercise unique, faithfully replicating the sensation of cycling on the road... More here.
That is a stunningly practical space saving design. Probably very expensive though.