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I see. I’ll request for smaller diameter tubing. The top tube will be 35mm and the down tube will be 40mm the chain and seat stays will be rectangular. The geometry will be a 76st/75ht which is between the Argon 18 Electron and the Parallax in XS. Will that be a better idea? Btw I also run 25mm at 120psi hahah.
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The MASH Parallex have a 28mm rake fork with a 72.5 degrees head tube angle at the XS spectrum.
More importantly; those are old school geometry, meaning the frame designer exaggerate the seat tube and head tube angle in order to make it fit a smaller rider, which in reality doesn’t, and in some cases actually fit them worse.
In all truth, I think the frame material will be as big a problem as the angles. Large diameter alloy is very stiff and the harsh ride will be magnified by the small frame dimensions (less tube length= less material to flex). I suspect a small carbon or steel frame with extreme angles would be less of a rattlebox than a small alloy frame with, say, 73 parallel. I have ridden USWB pre lo pro time trial frames and a 75 parallel crit bike in steel and they were fine (I ride 22"/56cm approx), the two alloy frames I still have are more relaxed, but still rattly bastards.
Note: I am the last person alive who still runs 23 or 25mm tyres/tubs at 100psi minimum.