Sphere Collider reacts to late as trigger

Hello everyone!
The following snipped should check if an endpoint of a machine is inside its workspace. Therefor I used a sphere collider and check the bounds as shown.
It looks like the trigger reacts way to late. Let's say the radius of my collider is 2 it starts the debuglog "Outside..." only if the target is about 2.5 units outside the center of the collider.
I don't get my head around this issue.

Code (CSharp):

1. if (Workspace.bounds.Contains(Target.transform.position))
2.         {
3.             Debug.Log("Inside Workspace");
4.         }
5.         else
6.         {
7.             Debug.Log("Outside Workspace");
8.         }

 

Okay... I found it. Bounds generates a Cube, not a Sphere. So... This is the wrong way to check a spherical workspace.

Code (CSharp):

1. Distance = Vector3.Distance(A1.transform.position, Target.transform.position); // Is the endeffector inside its Workspace
2.         if (Distance < 1.8f)
3.         {
4.             Debug.Log("Inside Workspace");
5.         }
6.         else
7.         {
8.             Debug.Log("Outside Workspace");
9.         }

This works perfectly fine