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Columbus Max tubes are bi-oval but spirit are circular, unless I'm going mad....
There is spirit megatube but it seems to be unidirectional oval.
http://www.framebuilding.com/Spirit.htm
I reckon standard circular tubes for me, given megatubes are for heavy riders who put out megawatts.
Very good decision you weight weenie! Just get the bi oval down tube vertically oval for absorbing braking and horizontally vertical for no noodly pedalling.
Oval top tube might again be less noodly with more comfort.