[1] Rigid or Hardtail bikes with only one gear; made for simplicity, low maintenance and reliability [2] Light, elegantly simple bikes with no shifters and derailleurs to foul up or breakdown [3] All-around on- and off-road use; there are even Singlespeed XC races [0] 
Singlespeed
T y p e
R i g i d
F r o n t S u s p e n s i o n
F u l l S u s p e n s i o n
D i r t J u m p i n g
F r e e r i d e
A l l M o u n t a i n
D o w n h i l l
2 9 e r
S i n g l e s p e e d