What is it called when,,,,,,

[weekend-fun]

When there are two sprockets attached to a bike cranks, what is that called?

like this:
http://ecx.images-amazon.com/images/I/410d0Ll7RDL._AA280_.jpg

 

[AaronF]

Three piece crank with two chainrings if that's what your asking..

 

[bandito]

10 speed crank?

 

[bairdco]

"extra gears you don't need once you put a motor on your bike..."

 

[foureasy]

"extra gears you don't need once you put a motor on your bike..."

there it is

 

[weekend-fun]

I was going to take off crank arms and rig a motor to on of them gears and a chain to rear gear on the other.................