For inline i always use flip hkd bearings because unlike in a skate truck you have to crank the bolts down in your inline skates frame and hkd bearings still spin fine when you tighten them down. Ive tried bones reds and many other bearings and only flip hkds spin freely like this.
I also use flip hkds on my skateboards because they still spin great and are smooth and quiet. They are also cheap as shit, you can get em for like 10 $ a
Set. Anybody else have bearing preferences?