Steel spring wire thickness to turn a crank?

Thinking about turning the crank of my bicycle with a wire spring. Approximately, how thick will be spring wire need to
be?

https://youtu.be/oAj1F5fSGWI

https://youtu.be/oAj1F5fSGWI

The spring will be placed between the drill and the hub spindle.
Thanks.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

http://www.plantengineering.com/single-article/relationship-of-torque-and-shaft-size/97eb6b3f6b32adcdd181341ebbdc3224.html
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

What are you trying to accomplish?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.