THESE ARE SOLD EACH. THE ct90's AND CT110'S BIKEs TAKES FOUR OF THESE TOTAL. CT90 = THE FRONT WHEEL TAKES TWO OF THIS BEARING. CT90 = THE REAR WHEEL HAS TWO OF THIS BEARING AND ONE OF ANOTHER (SOLD SEPERATLY). AS YOU SIT ON THE BIKE THIS BIGGER BEARING IS ON RIGHT OR CENTER IN THE REAR HUB. THESE FIT ALL CT90'S THAT HAVE THE TWO SPEED SUB TRANNYS AND THESE ARE FOR ALL CT110'S THEY TAKE 2 FR AND 2 RR THE FRONT AND REAR SEALS AND O-RING ARE SOLD SEPERATLY IF YOU NEED THEM. C70'S TOOK 2 OF THESE AND A DIFFERENT ONE FOR THE SPROCKET HUB 3D