car shakes at 45 mph

hey i have a 95 z24 and when i drive and get close to 45 mph the front end shakes now i have rotated the tires and this didnt help so im pretty sure it isnt the rim unless all of the rims are bent. under 45 and over 47 it is ok just around 45. i tried a search but i guess it was to vague so i ask for help. any help is greatly appreciated

try getting your wheels balanced

you also could try getting a front end alignment.