I have a pair of, maybe 2006, Mavic Ksyrium SSC SL's. The brake walls look like they have little chips in 'em. My buddy used them a few times in really nasty weather. Why I don't know. So....the walls feel worn just by running my finger over the wall/rim. Will I need to replace them? They look like they still have plenty of life left and, believe it or not, they are still true. Also, the rear hub feels a little sluggish. Can I get it rebiult? Should I send it to Mavic or just take it to my local shop? Need some help EXPERIENCED riders and mechanics!