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Can some one explain to me in easy terms how a helix works?

like a 54/40 60/54 . what does it really do ?
 

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Short and sweet.
The helix transfers the torque on the secondary to side force. The two numbers are the ramp angles. Smaller ramp angle higher side force.

Large ramp angle - quick shift
to a smaller angle to keep up the revs.
 
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