Magic trick for airbrushing wheel hubs?

I used the airbrush to spray paint the wheels of my airplane model black. The entire wheel, tire and hub is now black.

Is there a magic trick for masking the tire so I can spray just the hubs leaving the tire unaffected? I mean other than some extremely complex masking tape cutting?

Get a circle template and find the hole that matches the hub. Hold the tire against the template and spray.

[#ditto] This method makes any wheels with hubs soooo easy, especially on armor!

As per Wayne’s reply above, something like this:

From your local stationery/office supplies store.

Otherwise you can make your own custom sized masks using thin card or “blister packaging” and a suitable sized drill or reaming tool.

32 roadwheels on a PzIV x2 sides - you’re not kidding… [:D]

+8 return rollers, I absolutely love my circle template. One of the best 4 dollar investments I have made in the hobby!![(-D]