Nice question in fact I'm 1,79-1,80. So I chose medium because Megamo suggests this size of frame from 1,65 to 1,80. And I tend to ride not so big frames and also many suggest to go one size down for racing. In road for example  I ride 56. But I do road only as training. I've already put a 100 mm stem but with no significant drop (its -6°) and i feel fine. I dont have  test the behaviour with the longer stem on the steep trails yet, because of the corona.

Hello guys. The m7007II frame is exactly the same as the Megamo Track that races in the World cup series. I have the track 07 the budget version of the track used by the athletes of Megamo Factory team. Very capable and fast bike on any terrain. As it is my first F/S bike i found it difficult to set the fork and shock in the right pressures. But when its done its no problem, set and forget. About the geometry its fine and quite similar with the spark. But I have to put a longer 100mm stem over 90mm tha I use now and maybe a seatpost with a little backsweep. I am 1,82cm and  I ride medium size 17,5.