Find a tire shop with a Hunter Engineering GSP9700 Road Force wheel balancer. It tests tires for out of round and hard spots. Sometimes, the tire can be rotated a little on the rim to achieve a better match giving you a better ride. Purcell Tire here in St Louis has one and charged me $30 a tire to check mine.
Download a pamphlet explaining the features of the GPS9700 Road Force Elite Here's link to find one near you: (there's several on Long Island)
https://www.hunter.com/gsp9700The frequency of the vibration should lead you to the source. Tires are one frequency, a drive-shaft is another (more frequent).