I did the 21/18 combo on my 2008 street glide with Hogpro rims and tires.Only problem is I can't keep rotors from warping on the thing. It's ready for 3rd set of front rotors with 26,000 miles. The HD floaters are not the ticket. Maybe going to a more expensive aftermarket. Any suggestions from any of you high mileage riders?

 

I put a 21" on my SG and burnt the paint so I would definitly boar those rear holes out in the fender. Not to mention I saw a road king at my local dealer with a 21" wheel on the front and it also had a burned spot on the rear of the front fender