I have a 29r steel frame mtn. bike. Seatpost diameter is 27.2. To get the proper saddle height, I have to extend the stock 350mm easton seatpost about 2.5cm beyond the min. insertion line. This leaves ~8.5cm inserted into the frame, well below the top tube intersection. The specs for a thomson elite 410mm seatpost list a min. insert depth of 7.5cm. So, at 8.5cm inserted, am I okay, even though it is above the min. insert line? I was surprised the 2 manufacturers had min. insert lines so different.