A couiple of months ago I took my bike in for a check-up/oil change. Ever since then my front tire has been making a high pitch noise when I go around 50 mph or higher. It never used to make that noise. It sounds like the tire noise you can hear from 18 wheelers at night. I suppose I could just take it back the dealer, but I figure it's probably something like a brake adjustment or some other tweak. Anybody have any suggestions? Is it easy to adjust the brake if that's what it is?