gear sizes jackshaft

[pedalchopper]

working on jackshaft assembly... going to run either 3 speed rear or 5 speed rear....

What size gear optimal on DRIVE SIDE /MOTOR SIDE JACKSHAFT then, Optimal gear size RIGHTSIDE / DRIVE GEAR... Crank will be freewheeling.

Any info. appreciated

 

[MotoMagz]

What motor r u using?

 

[onejerkuwant]

Same question with a morini s5n and nexus 8 speed?