Hey guys, first time to post a message here. I ride a 2006 Cannondale F600. eastcoast Maryland rider. and i'm interested in trying some different tires... I'm riding Kevlar Velociraptors for now and am quite happy with them.. I do run them with low pressures....I don't don't know the PSI, but I keep them just enought so I don't hit the rim over roots and rocks..... Anyway, i'm hearing more and more about Large Volume (or Big-Air) tires and running lower pressures.... I like the idea, but when looking up tires on company sites, how can one tell if they air Large volume tires.... are not all 2.1 tires roughly the same Volume??? Is there a number or spec I should be looking for??? can someone send me a link to an example of a large volume tire..... I am interested in a XC tire which will not have a weight penalty... Thanks for anyones time.