This is in regards to bike geometry. I bought a bike last summer that happens to be considered a multi-sport tri bike. Let me add here that I am not a tri athlete (only in my dreams). I chose it for several reasons, mostly to accommodate my body. It does have a 76 degree seat angle, not terribly aggressive. I was looking at Running Mommy’s thread earlier about her new Giant bicycle. Being interested, I went to the Giant site and looked it over. Then I checked out the geometry and noticed the seat angle for me would be a 73 degree angle. The XS size is 75 degrees. Then I checked out Trek…the WSD XS was 75.5 degrees, for my size it was 73. It got me thinking--at the time I got my bike I had received remarks regarding my getting that bike because of the kind it was with the seat angle always brought up. It got me wondering. I realize that the length of top tube and head tube needs to be factored in. But, my wonder was, do short riders use muscles differently than taller riders? You hear a lot about how tri bikes save the athletes’ hamstrings for running… or something to that affect. Hmmm?