Mine are black 951s with trail grapplers. Highly recommended if you intend on any substantial trail riding, if not, terras are the way to go

 

I have some 20" wheels that I want to put on soon. Can I upgrade to a 33" tire without a level kit? I was thinking Nitto Terra Grappler 275/60/20. Just a little bigger than the stock Pirelli tires, which are 275/55/20.