Modelling a mechanical spring for a bike I am currently modelling a bike based on a Norton 961:



I struggle with modelling a proper mechanical spring. It should look like this, I think:



I really don't know how to make it look flowing and natural and having enough "layers".
Activate the Add Curve: Curve Extra Objects addon in the user preferences if you haven't yet.

Then just add a new 3D object with Shift + A Add > Curve > Curve Spirals > Logarithmic or Archemedian in you prefer.

Adjust the desired height and number of turns as required.

Adjust curve bevel factor from the Properties Window > Object Data (Curve) as desired and set the Fill option to Full.



You can then manually add the "flat" end loops manually by joining in a bezier curve circle object afterwards in Edit Mode.