Originally Posted by guadzilla

So since you are a math genius, quick - what is the fore-aft difference between a 72.5 degree STA and a 74 degree STA on a 82cm seatpost (BB to saddle top), which is longer than what most people will ride?

And what is the length of a typical saddle rail?

You do know that you can move the saddle back and forth to get the right pedaling position, right? And stems do come in more than one size, right? So given that the vast majority of people do not ride with their saddles slammed all the way on one end of the rails and with a 140mm stem on their bikes, what does that tell you?

But hey, stick to splitting theoretical hairs on the interwebz with your superior geometry skills.