Integrated seatpost, integrated seat mast, ISP…in the past few years there have been a number of different frame designs on the market that eschew a traditional, round/cylindrical seatpost that inserts into a seat tube. Instead, these frame designs have seat tube structures that extend far beyond the top of the top tube and incorporate some sort of specific fitting to hold the saddle atop.
Should you buy a bike with an integrated seatpost? For a buyer, the decision should consider the bike as a whole rather than the ISP being the deciding factor. In some cases like the LOOK, the ISP offers a way of tuning the ride in ways not available in other designs. In other bikes, the ISP model may offer a weight savings. Anyone who says that style doesn’t affect their decisions is lying, but an ISP can be executed in a way that does give structural benefits. It is also possible that the ISP will end up being the reason you don’t buy a bike.
It is interesting to note that a number of flagship road bikes have been released lately that have eschewed ISP and gone with frame-specific, aero-shaped seatposts…such as the latest Cervelo and the new Specialized Venge. However, Giant latest TCR SL Advanced proudly features an ISP, as do several other models at the tops of their respective ranges within the Giant road lines.