I just bought a new 07 Grizzly 450 and it is amazing...My question is what would be a good size tire to upgrade to for this machine

 

I agree - I have the same machine and love it! I am going with 26 Tires 26x9 in the front and 26x10 or 26x12 in the back when my stock tires wear out.. I am also staying with stock rim size as I don't want to widen the quad. I still haven't chosen the tire I want.. but I am looking at the Maxxis Bighorn and the ITP Mudlite XTR;s

 

I have been looking toward the Maxxis Mudzillas...is that a good tire