With the Ref pic loaded, again make a plane and convert to an Editable Poly. Move the pivot point to 0,0,0 and make sure the vertices on the left hand side are all at x=0. Also add a straight line spline (using the Snap Toggle) draw from the centre 0,0,0 out. Then rotate this 18 degrees - (360 /10 spokes)/2.

Keep modelling the edges out, keeping the edges within the boundaries - also put a little sweep back to the spoke as it goes to the outer rim - you will see this clearer in the later pics, but do it now as you create new edges up the spoke ! Just move each new set of vertices a little back.

Always draw some circular guides (centred at 0,0,0) so that the outer rim will be round ! When you have finished modelling with the vertices of the rim touching the guides, select the edges that need to be extruded, and the first extrude can be quite large to keep a nice smooth shape to the spokes. Then extrude a couple more times.

For the centre of the rim it is again IMPORTANT that you use a circular spline guide. You can then just adjust the circumference to match the new edges as you create them.

Also as you create each new edge go to a side view and pull the selected edges back until you get the sweeping shape.

This will give us a shape like this :

Now add the Symmetry modifier :

And the Turbosmooth modifier :

You can adjust edges here to get a deeper dish etc.

Now add an Array with these parameters :

Continue to : Part 2. Modelling the hubcap