This directly from PRO-LITE website:
"There is so much garbage talked about the ideal tyre pressure you can write a lifetimes reading on the subject. The bottom line is what
do the pro’s do? They get their tyres pumped up as hard as they can go. Why? So they use less energy to go as fast as possible. Bear in mind they also get their tyres for free.
Carbon clincher rims are subject to tyre pressure limits due to the fact they flex and over inflating them will increase the chance of it coming off the rim under heavy braking. Not everyone can afford the tyres top pro’s ride.
Don’t let famous brand of wheels or tyres tell you that you might feel you are going fast but actually the vibration will wear you down and
sap your energy. This could only be written by people who have never actually raced as pro and had to pedal tens of thousands of kilometres to get a pay cheque each month.
So we recommend you buy the best tyres you can afford and pump them up hard. Even on our test bikes we will fit cheap tyres that say 110 psi max pressure. We always pump them up to 150 psi minimum without problems."