Originally Posted by
PeteHski
I am sure there are many possible reasons for this. I find specific build spec can make quite a big difference to comfort e.
g wheels/tyres, saddle, bars and seatpost. For example my Giant Defy has the cheaper alloy bars and they are definitely less comfortable than the carbon bars on my Endurace. The wider rims on my Endurace (22 Vs 17 mm internal) also make a big difference
The biggest factor for this is that the main reason endurance bikes are marketed as endurance is a more upright sitting position, but that that does not necessarily imply more comfort. After I got a fit on my aero bike, I became even more comfortable. The fit made my position more aggressive, not more upright.