wobbly speed wobblings....

[unfazed]

Your first check should be the wheel bearings and then the wheel balance. Front wheel first and then the rear wheel. Take off the calipers before you check the wheel bearings, you cannot check wheel bearings properly with the calipers on and then take of the wheel to check the balance
Check the rear shock and linkage bearings and finally check the Swinging arm bearings.
Wheels can go out of balance from numerous things like hitting potholes, hitting speed ramps or losing a wheel weight.