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I have an 07 FLHTC and took the bumbper off when I brought it home 3 years ago. This past winter I put E3s front and rear and I can hear a slight hum at around the same mph. I just learned to turn the radio up a bit more.
Thanks for all the replies guys. This was definitely the tires. The wind noise overpowers the tires at 60+. So no biggie. My pipes and build take care of that very well. Just riding through town you could hear the hum.