This is all part of checking for shaking above 50MPH or so?
Got any looseness in the wheel bearings?
Play in steering or suspension bit?
Ruber bushes okay?
As you roll the wheel slowly by hand (not spin) do you feel any stiff spots, like a warped rotor?
Disc brakes are often stiff.
You can use a flatbar and retract the pads from the rotor to check for wheel bearing issues (and, if you take the wheel off, retract said pads, hold the upper part of the suspension and give the hub a spin.....you will FEEL bad wheel bearings).
To make sure you don't have an issue with brake fluid pressure holding on the calipers, crack the bleeder on the caliper, then close it.
Any excess pressure will go "poof!" and it will spin.
Hoses, master, several things can cause that.
Dave