ok so maybee im not really a trials rider as i dont ahve a bike yet but im a downhiller and i run my tyres at like 20psi most of the time at my local track which is quite gnarly and not exactly slow as you can see(check the web address below). http://www.pinkbike.com/photo/1010825/ dispite this i havent had a puncture since god knows when all im running is a set of maxxis high rollers on mavic 729s with nokian DH tubes maybe a lil on the weighty side but it works my advice is get sum phat tubes and let your pressures down you'll be gripping like a beast