I chose to rent a bike from exodus supposedly had front suspension. My bike only had 1" of travel so was pretty much like no suspension.
I Took my own saddle and pedals of which I was glad.
Biking was easy smooth technically not too demanding and 100% ridable. I found the food good and plentiful and the trip staff (cook, driver and guide )very good.
There is not that much to do beside shopping and drinking in UB.
The local kids love balloons - take some to give to them.
If the Exodus staff in the UK were as good as the staff in Mongoila I would have no problems, but they are very variable in reliability. I rang quite a few times with queries and on some occasion I was told people would ring back, but they did not. Once I made a complaint, as one guy did not even pass on the message. Later I was told that no record of my complaint was made. The quality control there is clearly an issue.
Exodus booked us flights via Soeul. S Korea- this was a 12 hour flight. On the way out We then had to wait 6 hours for a connecting flight back to Mongolia (which we had flown over on the way. However there was another flight to UB with the same airline that left 2 hours before our flight.
We finished cycling on Thursday, and drove back to UB on Friday arriving at 4 p.m. then off to see a local cultural show which was good. Our flight was booked for Saturday at 23-50. So we had a whole day to do nothing in UB. We all felt that getting the flight friday night would have been better. OR sometime later on Saturday, since we then had a 10 hour wait to get our flight back to the UK.OR do another day cycling so there is not a dead day at the end of the trip.
Presumably Exodus do some sort of deal with Korean airlines to get cheap flight tickets. Their priority should be to minimise transfer time and maximise cycling time.
The first two days of the trip is now on road as the tracks were tarmac tarmac-ed 2 years ago. teh loacl guys say they have told Exodus- but the trip notes have not been changed.
The trip notes say 'overnight is a comfortable sleeping compartments on a train. Dinner is taken on the train - the train trip is awful - to be endured not enjoyed. No-one got any sleep and dinner was a sandwich!! - This should be deleted from the trip and travel by road instead.
There were only 4 people on my trip. A couple a lady and myself. I rang up four weeks before the trip to get add a single supplement- instead of informing me it would not be needed as there were only 4 on the they happily took my money.
So I suggest to make the best of the trip expect exodus to cause you a few problems, Book your own flight to minimise the transfer times and likely contact the local company direct to avoid wasting a day at the end of the trip. Apart from that you will have a fab time.