The bike uses 26" wheels, of course, so all you need to do is buy some 26" mtb slicks and install them. You'll probably need some smaller volume 26" tubes, too, to better match the size of the narrower slicks. There are lots of mtb slicks to choose from, check out Nashbar, Performance, etc...........I'm not sure I understand your question entirely, but if you're saying you want to buy a separate "road" wheelset, keep in mind that most modern road bikes, and hybrids too, use 700c wheels. In addition, rear hub spacing is different from mtb (135mm) to road (130mm). If you really want an extra set of wheels, so you can switch back and forth between slicks and knobbies without having to remove the tires from the rims, just buy an extra 26" mtb wheelset. Even then, you'll want to make sure the width of the rim is the same as your existing wheelset so you don't have to adjust the brakes each time you make the switch (assuming your bike has rim brakes), and to make it all worthwhile you'll need another cassette, too, with the same gearing as your existing one (unless you want to remove and re-install the cassette each time you change the wheels). If you have disc brakes, and you want another 26" wheelset, make sure the new wheelset is compatible with your disc brakes.