I actually did raised my seat already, and it feels that if i raise it more I will have to point my toes down on the stroke. I do think it might be the seat and the fact that it was my second ride this year for such a distance more than 10 miles. Actually, it's more my front than my butt that's sore now. There could be hundred of factors that go into this: 1) my bike was never fit to me, i got it from ebay as a trainer bike, 2) i dont ride on hoods because they dont have rubber covering and my hands slip from metal, 3) i was too nervous riding next ppl and was not completely relaxed (but i am getting better at it). But i am planning on getting a new bike pretty soon, and i will make sure that most of the factors above will be taken care off, esp the fit.