[Ben Piecuch]

It looks like you are machining your own wheels. If that's the case, why don't you just make a center wheel that is slightly bigger that the two outer ones. The speed of that wheel will be negligibly higher than the outer two, but it will allow you to have a standard pillow block in there, as opposed to the IGUS ones. This could make for a possibly more robust drive setup, as some teams had problems with those plastic IGUS bearings last year.

BEN