If you have already dealt with the Honda CRF 450 2013, will have certainly noticed that you can no longer use the rear wheel 2012 and the construction of it. The hub has widened in the 2013er model by a few millimeters, as well as the front sprocket did. If you wanted to use the "old" rear wheels, the alignment of the chain would no longer fit.

To compensate this, there is the aluminum sprocket adapter kit, black anodized.