I am not sure why but I have a whirring sound only when I am riding in 6th gear at about 3800 rpm on my 2007 K1200GT. I just had a new Michelin Road Pilot 3 installed on the front. I have kept the Michelin Road Pilot 2 on the rear until next Spring. It is not an engine or suspension issue. Oddly, the bike performs admirably at any other speed. The sound is annoying and unsettling. Any ideas?