I lived in Arizona and most of the non-Jeep trails there should be fine on even the stock tires, and no tires are going to get you through a Jeep trail.
Here in the northeast, dirt bike trails are a different animal. They are just rocky and muddy enough that you NEED knobbies on most of them. I took my Z125 down an ATV trail that wasn't too bad on the stock tires, but there is no way it's making it on most of the trails that I take my WR250R on. To be fair, I wouldn't want to take a KLR650 down them either(I had one years ago in PA), but with knobbies, I think the Z125 could survive a lot of them. The stock tires really fail in any kind of mud or over even small rocks and tree limbs. I also tested them in the snow. Don't try it, lol.
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