Wife’s 2013 civic hybrid started making a humming noise noticeable at highway speeds. Sounds like the drivers side rear. I jacked the rear of the car and spun both tires to see if there was any tightness or grinding, thought it might be a bad wheel bearing. Didn’t feel anything. I removed both tires and removed the drums to inspect, nothing obviously wrong. Michelin tires look good. I’m wondering if it is the bearing, just don’t notice until highway speeds.
170k miles on this car.
what you guys think?

 

Swap wheels. I suspect bearings. At 170k, it's probably time.