car vibrates at 90

[raahee]

hi i have a very serious problem that is when i drive my car mazda mx5 to 90km/h the car starts to vibrate til i drive to 100 km/hr and then it stops after that

what could be the cause please help

[mazman]

Its a sure shot tyre balancing issue that car wobbles on one specific speed and goes away after that.

If it doesnt get fixed with balancing get it align too.