In the first weeks of ownership, I installed the Fenda Extenda IIRC. Likely from Twisted Throttle. I haven't had issues with the tire wearing it or vice versa. I may have taken some forum advice and used a heavier duty two sided tape in addition to the plastic "rivets" provided with the kit. So far so good after 11k miles.
18 K16GT Option 719 Blue Planet Metallic with matching BMW top-box, Bomber Brown RDL, Denali D7s, Ilium f&r bars with highway pegs
IBA # 63673
14 FJR-ES Candy Red (sold)
83 CB1100F Blue White & Red (in a garage);
83 CB1100F Red White & Black (in a shed);
76 CR125 Elsinore Red (sold);
73? CB125S Torquoise (sold)