Depends on how much material you remove from the hub.  Not sure how much of
it is "unnecessary".  Also not sure I'd want to explore the limits for safe
material thickness on the hub.

Other idea is to swap the rotor for one that fits the wheel?
You would need a rotor with the proper offset to work with the caliper,
proper diameter, thickness, spindle clearance, and of course bolt pattern.
Then you would need to figure out how to make the wheel bearings work,
either using vanagon parts or a hybrid setup.
Bear in mind that not many manufactures use rotors with integral wheel
bearings.

Boring the wheel center holes seems trivial compared to all that.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Mike
Sent: Saturday, February 06, 2010 7:29 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Wheel swaps and center bores

Has anyone ever done it the other way?

  ie; machine down the un-necessarily large OD of the front rotor hub, and
(if necessary) install a different bearing cap?
  How about swapping in front rotors that just fit the new wheel?
  The rear drum/ axle nuts need no modifications, right? You just remove the
drum retaining bolt, so it'll sit flat (or machine recessed bores into the
back of the wheels to accomodate it), right?

Just a thought I've been mulling over for my own '87 Westy.

Mike B.

----- Original Message -----
  From: TJ Hemrick
  To: vanagon@GERRY.VANAGON.COM
  Sent: Saturday, February 06, 2010 12:12 AM
  Subject: Wheel swaps and center bores

  All,
    I'm considering getting the center bore on my Audi rims enlarged to fit
  over the front axle dust cap on the van.  With everyone trying to make a
  buck, I don't want to walk into "Bubba's" backyard machine shop and have
him
  tell me, "She-ott, I can cut those rims to fit a Kenworth".  When I get
  enough input from the locals on reputable machine shops (and that will be
  hard enough as their are very few shops to speak of down here), what
  equipment should they have and what questions should I ask that will
  separate the A-team from the posers?  I've got to find a good machine shop
  anyway so I'd rather do it on a rim and not an engine.

  Thanks,

  TJ
  Melbourne FL
  87 Syncro