Hi guys, i just bought my Miata a week ago and when I test drove it, it was fine when i took it up to 60 but did hit a pot hole a good one but at 15mph. Anyways right around 70 to 78 it has a strange vibration coming the from the passenger side rear area. It comes and goes at those speeds but does not do it at all below 70mph. The passenger rear caliper was replaced by what via paperwork I got with the car. No clicking noise is coming from the rear cv's. No smoke either from the right rear rotor because I drove it home for 4 hours and when I stopped I saw no smoke as I inspected the wheels cause if the caliper was sticking I would have probably seen smoke from driving that long. My guess is its just out of balance, but it is fine at lower speeds or a bent wheel or broken belt in the tire. How can I tell if the tire is damaged? What do I look or feel for when I run my hand across the tread? Any ideas are great, this is my first Miata so im learning as I go.