You can trial balance yourself using of all things...a radiator hose clamp...
Use a screw type clamp ...unscrew the clamp, place it around the end near the rear gear and tighten...
Test...if it vibrates, loosen the clamp and rotate it 180 degrees...retest...
You will be surprised with the results...
Also, on your wheel vibrating...I will almost guarantee the wheel is buckled a bit...or egg shaped...try another wheel on that axle...
