So I switched to tubs 6 months ago and have been tinkering around with tyre pressure. I did a bit of research, but that just totally confused me. People I train with and on forums saying they run their tubs anything from 80 psi up to 160 psi. An ex Olympian cyclist, Matt Illingworth mentioned he used to run his at 160, but 140 psi would be OK, with my Vittoria Corsa Speed G+. So I've been racing with them between 130 and 140 and they've felt good. The road surfaces are generally good. I had a chat with Jack Bobridge (Olympian & TDF) after a race (OD, he did the duathlon) and mentioned what tyre pressure I was running, he looked at me like I was mad! Anyway I had a sprint at the weekend and decided to stick them up to 150psi, excellent roads, but I was very sluggish on the bike. I really struggled. I could have just had an off day, but bike didn't feel right. I'm thinking of dropping them down to 120ish but not sure. So what's the science behind tyre pressure? How can I find optimum tyre pressure for me? I'm 160 lbs. All the roads I ride are on pretty good quality and I never feel like I've getting bounced around.

Note - I'm aware inflating to 150psi was probably a dumb ass move, a bit of an experiment if you like.

I'm running 23mm Vittoria Corsa Speed G+ tubs on Zipp 900 disc and 808 front