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I've just fitted a set of 33mm Vittoria XL Pro TNT's to my CX bike and noticed the tyre wall says minimum pressure of 45psi, will there be any issues running lower than that when conditions allow?
They're set up tubeless on Stans Grails, which also happen to have a maximum tyre pressure of 45psi for 32mm tryes.
only issues i had with my vittoria were a loose fit, so i couldn't run them much lower than 45psi or they'd pop off!
These were silly tight to be honest, took a lot of effort to get them to roll onto the rim.
I've been running Vittoria XG Pro TNTs at getting towards 20psi. I haven't had any problems with the burping or rolling off. The only reason I haven't gone lower is to avoid trashing the rims on rocks and roots.
We are running xg and xm at around 18-20 psi on crests with no issues.
I've had mine down to 20-30 and could feel some rim at times. No probs but they were tight on ENVE XC rims so I'm not overly worried about them coming off.
to be fair to the Vittorias, i think it was my crappy wheels at the time!