I couldn't car less.
Join Date: Nov 2003
Bikes: Ritchey P-series prototype, Diamondback, Nishiki Triathelon Pro.
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My take is, 1990 Tom Ritchey the major bike frame designer in MTB, altered his racing frames, inclining the toptube. This alters the torsion of the frame (more ridged) and lowers the frames center of gravity...and its lighter with the alteration.
Almost all Japan production bikes followed Ritcheys geometry. These are the Rockey Mountain etc bikes.
Anyway, Ritchey and then Brodie made racing bikes with incline tubes.
Now it's standard for MTB. It's also now found it's way into ALL frame building, road, XC etc.
IMO, or a factoid.
Good stuff, I don't like horizontal level toptubes at ALL.