Pretty much ignore seattube length , it's adjustable . A much more important measurement is the top tube length . Get a good comfy length with a suitable sized stem ( I prefer not much longer than 50mm but many are happier around 100mm , depends greatly on your riding style and where you ride ) . Next thing to worry about is the axle to bar height measurement ; again find something comfy that suits you personally . Best to go to a shop ( kinda why they exist ) ordering online is something best left to those who have already worked out their favourite lengths and angles . Nothing worse than seeing someone on a too big/small , long/short bike .
My explosif is something like 13" centre to centre and I'm 5.10
The length and bar height is spot on for the bikes intended use , sprinting through tight corners . The small frame is stiffer and a fraction lighter than the " correct " sized equivalent , offers immense standover clearance for any sudden step off the bike moments too .
"It also has a seat. I don’t use it, but you probably will for the first few years until you build up the muscle."