Oh, and if you decide to go through that process, do remember to take into account the wobble of your wheels. Measure the alignment of both extremes of your wobble and tweak your gear to get the midpoint right. Obviously for our purposes tighter wheel to gear fits are preferred, but all of our wheels wobble a little because we just stick a plastic hub onto a steel shaft. It really doesn't hurt much though because under load the wheels are going to center on the axle pretty well.