Originally Posted by JamesArluck

A few years back Trinity made some rear wheel spacers for their 12th scale lineup. They were designed to be used inside the wheel to keep the screw heads from digging into the plastic wheel. You may be able to use those to shim out the wheel on the hub. The part number is TRI90572. Picture at http://www.kimihiko-yano.net/Product...e/TRI90572.jpg

Another option would be to space out the axle and use the Niftech pinion shaft extender http://www.niftech.com/catalog.php?mode=4000 and some short boss pinions to line up the pinion and spur. That would keep the wheels running a lot more true than trying to space them out at the wheel hub.

-James