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Everybody is different, I am 5'5" with a standover of 29" and my Genesis has a 539mm top tube and 90mm stem. TBH standover and inseam are not the critical factors, the TT length and seat angle are more so IMO
Does your friend have a bike that is comfortable already? If so then try to replicate the fit of that. Start with the saddle set back, i.e. the horizontal distance the saddle is behind the BB, then work out the reach to the bars from there.
Be aware that the Pomp has a relatively slack seat angle which, once you have adjusted the saddle set back, results in a shorter reach to the bars than other frames with the same 'effective' TT length. If I was buying a Pompino frame I would pick the Medium.
niggle
Guys, quick bit of advice on sizing for the Pompino, I'm building one for a friend who is 5 feet 7'' with an Inseam of approx 28-29''. Should I be rolling with a small (52.5cm TT) or medium (54cm TT) . I ride a 53cm TT and am 5' 9'' inseam of 30-31'' and find it perfect so I'm thinking maybe a small?