BIKE MECHANIC
Join Date: Jun 2005
Location: Dayton, Ohio
Posts: 185
Bikes: 1975 Full Campy N.R. Centurian Super Lemans,1984 Focus Vintage pre susp. mountain, hardtail,suntour xc sport, many treks, diamondbacks, and, 1950' crusier J.C.Higgins,triex (road) and kakakura silk (road)
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i believe you're refering to the seat tube angle and not the seat angle. the Seat angle is always level or parallel to the ground. With the exception of a brand new Brooks Leather saddle, i always tip the nose down the tinest bit(2-4mm).This helps to relieve pressure on a new saddle.
Now for frame building, look at detailed photos of bikes that you want to pattern your frame after and measure the angle of the seat tube in the photo. Aero bars are used primarily for timetrails and ironman style triathelons. Look made a nice time trial bike with aerobars and the seat tube looked to me to be closer to a 74.5 or 75. Keep in mind that the body is shifted forward almost in front of the crank.
Check out the different bike companys frame geometry spec's.
good luck