I was wondering if the 26in Maxxis bighorn radials would be a good after market tire or if I should stay with the stock size?

 

sounds like a good size to me, just depends on what you want to do with it really.

EDIT: are u askin for opinions on tire models or sizes?

 

mostly trail riding and mud during winter.

 

I don't know how they handle, but I think they look really cool. But from what I found they are pretty pricey. I can't see them being the better choice for mud but they should perform well in snow and trail riding. I too was looking at them for my kodiak, but I'm leaning towards 25" 589's.