It seems that Trifox has not put any thoughts on seat height. I bought an XS size Trifox X10 for my girlfriend. Shes 1.65 and rides with 70cm saddle height from center of BB. But when the bike comes out of the box the minimal seat height is 74cm. After that the seatpost gets stuck in the aero shape of the seat tube. So you first have to cut your seatpost to get to the reasonable saddle height for this size. Obviuosly as youve written if you are on the taller end you are screwed because Trifox has not thought about the seatpost and height on their bikes..

On a side note, i also experienced seat post slippage... Too bad i just read about scraping off the clear coat now on here. The seat post slipped and got stuck on the aero shape bend of the seat tube. The frame is now cracked and i will probably never hear from Trifox again..Maybe i will make a thread and post some pictures of the whole fiasco... this was all while still testing the bike fit on the trainer not even riding outside...