Change radius rotated cylinder

Is it possible to change the radius from a rotated cylinder and not the length.
I have a modeled a shock absorber which is already in place.
Normally I use S + shift-Z but how when rotated.

If you tap ā€˜zā€™ more than once, the alignment for the rotation will switch from global to local, so hold shift, press zz, or zzz. That said, you should just need to change the axis you are locking, so try either Shift+x or Shift+y depending on how you have rotated it.

Thanks s shift +z z was the answer.