You are reading a single comment by @PhilDAS and its replies.
Click here to read the full conversation.
-
Not on traditional frames with equal angle seat and head tubes. The height of the top tube is irrelevant given a quill stem essentially extends or shortens the head tube. A taller frame with a slammed stem will have saddle and bars in exactly the same position as a lower frame with equal length top tube if the stem and seatpost have more length exposed.
PhilDAS
lesterama
Yes and no. Seat and top tube are both intrinsically linked to reach, fit and ride. A taller seat tube puts the start of the top tube back, reducing reach. Most manufacturers have slacker seat angles for longer seat tubes, reducing the reach even more.
For example, with Corsa Extra geometry, I can get away with a 56x56, 57x56, 57x57 and 58x57 (all c-c). But a 57x57 suits me best, and a 58x57 ain't as good. And a 58x56 would be a non-starter. (I'd like to try a 58x58, but never seen one.)