With the possible exception of some cushion, I can't fathom fat tires for anything but soft sand or snow. The aspect that always "scared" me was the possibility of a flat tire. I changed a tire on a friend's Mongoose Dolomite once and it was a bear (possibly this was so low end a system as to not be representative), and I had a pneumatic pump to air it up. Fortunately in socal it's a no-brainer.