How to transfer geometry from one object to a new one?

Question

JavaScript

Let's say there is an object

var sphere = new THREE.SphereGeometry(111.65, 32, 32);
var sphereMesh = new THREE.Mesh(sphere);

We can get its geometry

var geo = sphereMesh.geometry.toJSON();

But how do I create a new mesh with geo geometry
If I just paste:

var mesh = new THREE.Mesh(geo, new THREE.MeshPhongMaterial({color: 0xFF0000}));
scene.add(mesh);

we get an error:

Cannot read property 'center' of undefined

How to be?