Is it clear to anyone if the tube diameters are generally smaller on the six13? I would think they should be since the rationale of oversized tubing would no longer seem to apply. Also, any thoughts on the complete build kits available for the six13 versus the current R2000, R3000? I'm thinking the current R3000 with DA and Ks is looking like a pretty good deal at <3500 compared to the six13 with DA and DA wheels at 4200. I guess the question comes down to the difference in ride quality (comfort) afforded by the six13 frame.