I have the Razrs in the 6 ply. They are only 1 lb heaver then the 4 ply. And to me thats worth not haveing a flat tire [img]i/expressions/face-icon-small-smile.gif[/img] I run them HARD and they hold up OK. You push any tire beyond trail putzing to trail racing and they will wear faster.. I like them good hookup.. but get them from www.rockymountainatv.com they are like 48 for the 22 and 42 for the 20's