I have an 06 DRZ400SM that has the EXCEL rims and street tires on it. I want to use it in the Dirt 90% and want to change the rims. Will there be any problems bolting on a front 21" and a rear 18 or 19" on the SM? I would like to keep and use the SM front rotor and both axles. Was wondering if there is a market for trading these for dirt or how much $$$ could I expect to get for the excels with Newer tires. Thanks for your input.