Originally Posted by vintagebob
It's possible. My front is a 90/90-21 which is a bias-ply. I can't locate where the sound is coming from though. Maybe some other 800XC owners will chime in.
I've owned several motorcycles in my time and have never experienced anything like the sound from these tires.
Same size as the front on my GS. When I get around to replacing the front, I'll post back.