Adding to Red Leader's points, the steel sprocket is important but so also is clarifying whether the rear hub has been changed from the silver ones on early models to the black ones now used. The new ones offset the rear wheel by about 5mm and allow the belt to be optimally aligned to avoid hitting the tyre or running off the side of the sprocket. Why do we know this? We have an early 2012 version and have lived through all the various modifications/corrections - Phil B's Centa update is next....
