[DonRotolo]

Just remember that the CAD wheel does not expand when inflated or loaded like the real wheel does. This means, put the sprocket 1/2" further out that you think you'll need, or you'll find yourself cutting new spacers because the chain rubs the tire.

I learned this the hard way.

Oh, and the larger OD your spacers have, the more torque they can transmit to the wheel hub before failing.