What's the Diffrence ( Sprockets )

[bikebudy]

I'm looking to buy a jack shaft sprocket, but

There is #40A

There is #40B

Which one is for #40 Chain? And why the distinction of A OR B

 

[Raskin]

Both..it has to do with how allens (if any) mounted ..offset...i noticed working on a jackshaft..i used b. Bikebudy...

 

[bikebudy]

Thanks man, I did not know this and it now makes sense.

 

[PAP]

Some of them have integral keys, also.

 

[Raskin]

Some of them have integral keys, also.

Yep PAP..i used b it had allens and the key was part of the sprocket