Kenda Kwick Trax. Have 26x~2 but also available in 700c (see link). They have a fine block tread. Tread 'sings' on dry pavement; it must be slowing me down some. Tread might help in some circumstances; say, cornering on a sand coating over a hard surface.

http://www.bikeworldusa.us/ACTION-TI...source=froogle