This is the exact problem I'm having with my 2015 Bad Boy I bought on close out from REI this past Spring. I probably have about 500 miles on the bike by now, but the problem started right away after I purchased the bike last spring. All this time I thought it was the disk brakes pads or rotors. But tonight I had the pads out to try some disk brake silencer on them, and I happened to spin the front wheel without the pads in and the squeak was still there loud and clear. I'm going to pursue this dust seal as the source of squeak next. That makes sense.