For racing I am running Conti TT podium Tubulars, that are 22mm on FFWD 90mm front and FFWD disc rear. Last year I was running around 140psi. This year (only just started) I am running nearer 125 front and 130 rear. The main reason is the roads can be pretty crappy round here and I as trying to soften the effect. However, I usually race decent D/Cway courses and anything up to 100m, though as you know, they are not perfect all the way along…
For training on my 38mm carbon training wheels I have Front Conti Gastorskin tub 25 running at 125psi (It came with the wheel and has not worn out yet) and rear, 22mm Conti competition Tub which again I run at around 125/130psi.
Are these “The fastest”? I don’t know as so many other things change. I have even clocked my fastest times last year in windy conditions with the 38mm front and the gatorskin. Hardly the most
efficient rolling resistance.
My mates recommend the new Vittorias tubs as lower rolling resistance, but as it is such a faff to change tubs, I have not swapped yet. (I have vittoria Pista G+ on my track bike running around 145 PSI and they are fantastic - but that is on a proper indoor velodrome). Quite different.
I generally look for and follow the manufacturer’s guidelines on pressures. On the basis their testing is more systematic than mine. The make and model makes a big difference.
I hope that helps a bit. Which tubs are you running @colinio