Originally Posted by
70sSanO
It is pretty simple. The correct answer is based on what is used by those who actually get paid to ride fast.
There is a lot of data and people can argue all they want, but if professional cyclists are riding wider tires that is the most compelling evidence. And that evidence is mirrored in the lack of availability of 700x20 clincher tires that were so prevalent 35 years ago.
John
Geraint Thomas mentioned in a recent podcast that he runs around 4.5 bar (65 psi) in his road tyres. He's around 70 kg and probably running 26-28 mm wide tyres (Conti GP5000S).