Honda 2006 CB600F Owner's Manual page 223

Specifications
Power Transmission
primary reduction
gear ratio, 1st
2nd
3rd
4th
5th
6th
final reduction
standard
sprocket sizes
final drive
214
Technical Information
1.863
2.928
2.062
1.647
1.368
1.200
1.086
2.800
drive (engine) sprocket:
driven (rear wheel) sprocket:
chain
D.I.D. 525VM2 or
15 teeth
42 teeth
RK 525RO