Hello Econaut
When unfolded, the seat measures 120cm long and 60cm wide. I hope I was able to help you. Lg

You can fold it together with the wheel and pedals. I can store the Challenge in a gap of 40cm.

My seat is just 130cm in length. Measured from the bar at the front by the pedals to the back of the backrest. However, it can also be made even shorter so that you sit a little higher.