Hi, Today I did an olympic-distanse triathlon, and the bike leg was a no fun at all(40k in 72 min, 6-8 min more than I had hoped). My thighs get sore and stiff almost immediately (primarily on the lower outside of both thighs), and it feels like I have almost no power in my legs. I rode on a road bike with an triathlon clip-on aerobar. I almost regularly get the same feeling when using my road bike. The strange thing is that when I ride my off-road bike on gravel roads, I feel much better and able to produce power in a totally different (better) way, and I can ride fairly long rides (>3 hrs) with the same good feeling. Does anyone have any ideas of what may cause this difference? I am thinking that the position on the bike is a key issue, and that my thighs somehow does not cope well with the forward-leaning aero position, whereas the more upright off-road bike works better. This may indicate thight/short muscles, but I would really appreciate any opinion!