ELITA ONE Carbon Seat Post Setback 5/20mm 25.4/27.2/30.9/31.6 MTB/Road Bike Seatpost Ultralight 150g Carbon Fiber Half Shell

The reviewer mentions using an Elita One offset seatpost to achieve the desired fit on the AF01 frame. They note that it has a circular fastening mechanism that allows the mount to rotate almost 360 degrees, enabling them to turn the pin 180 degrees for forward offset while still setting the correct saddle angle. They also mention that they will miss the comfort of a standard seatpost but were able to achieve the desired fit with this seatpost.