Meh, I've always rode trials that way, If you've got the skillz to pay da billz then your tyre will grip whatever the pressure I used to run 85psi back in the day of running 20" wheel on my da bomb, but I've never run less than 30-35psi I find that if it drops below that my tyre fold too much when bunnyhopping or fold over too much on gaps or gaps to 90 etc, nobody likes to ride my bike due to those pressures Olly.