Turns out when I got my BST CF wheels, the rear wheel was a 6" wheel instead of 5.75". Yesterday I noticed that the wheel rim was starting to rub on the swing arm. The great folks at Motowheels will exchange it for a 5.75", however its going to be a week or two. In the mean time, I'm going to have to put the stock rear wheel on. I have a track lesson scheduled for Monday and I cant miss it. Will there be any problems with having mismatched wheels,( CF front, stock rear), besides looking bizzare ?