Vibration in rear end?

I have a 97 mazda miata, once i get around 65+mph i get a vibration in the car, it feels like its coming from the driver rear. Shock?Spring?Wheel bearing? idfk. is thier anyway i could figure this out? Btw it has brand new tires.
Thanks
Joe.

Brand new tires, go and get them rebalanced.

seconded

:uhh: vibration in the rear end…sounds like a personal problem, jk

odds are you lost a weight, samething happened to me and when i brought them back to sears they put another weight on…problem went away