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I had a front tire start to "delaminate" on me which created a slight bump and wave in the tread that only shook at.....well....about the speed you describe.
Or could just be out of balance. But look closely. You could see my problem only when they spun it on a balancer.
Well, sometimes even brand new stuff is defective.
Whatever the problem might be, you are going to HAVE to take it to a tire shop to find out. Sometimes tires don't get mounted "true" and they have to be redone.
If the tire and balance all checks out, maybe you have a bad shock. Dunno how old your car is or the miles etc.
Regardless, you have a trip to a tire shop in your near future!!
You haven't hit anything on the road lately right? Or a curb or...?
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