I just purchased an 05 Rubi..first upgrade will be the tires. I live in Colorado, so a tires that is good on rocks, trail, snow, and probably a little mud would be good. After reading posts all weekend, the following tires all seem to be good. I would like to be 6 ply Radials, and I am not positive if all these are.

Dirt Devil
BigHorns
Gator

What about size?? The stock Rubi has 25", I would like to go to 26" if I'm not losing much power. I heard the Bighorns run a little larger than advertized and are heavy, but are awesome for rocks.

Any help would be appreciated. Thanks.