Great discovery of Mongolia, in terms of landscapes, driving experience, atmosphere created by our Tuk guide and the team of mechanics (5-star coffee breaks, guitar evenings, etc.), and encounters with the local population (2 nights with nomads, unforgettable atmosphere and sensory experience).
I think it's important to find a solution so that we don't "lose" almost three days (out of a 12-day trip) in long, straight-line journeys to leave the capital, and return on the last day. That's 2-3 days that are clearly of lesser, limited interest. Perhaps the bikes could be based a little further west rather than in the capital, and provide direct transfers from the airport?