A wheel that is not seated will shake however well it is balanced
Balance is the explanation people reach for, and it is not always the right one. An assembly that is not sitting flat against the hub produces a vibration no amount of balancing removes.
Several things cause it, and none is exotic. Corrosion or debris on the mounting face, so the wheel sits on material rather than on metal. Fasteners tightened in the wrong sequence, which pulls the wheel on unevenly. Fasteners tightened to the wrong figure, or tightened with an impact gun and never checked.
That is also why a vibration that appears immediately after a tire change deserves a different question from one that developed over months. The first points at how the wheel went back on; the second points at the tire, the wheel or something worn.
Clean mounting surfaces and correct tightening are unglamorous and they resolve a meaningful share of vibration complaints.
What balancing actually protects
Tread, which otherwise wears in patches and takes a set off early.
On a commercial tire, the casing as well. Patchy wear can cost it its retread life, and the plant is on this site, so that is a direct loss rather than a theoretical one.
When to ask for it
The national tire and wheel balancing page lists the occasions. The one to add is any time a wheel has been off and put back by somebody in a hurry, which on a fleet usually means a roadside change.
A vibration at every speed, or a steering pull, is not balance. That points at alignment or at something worn, both handled here.
If it survives a balance
Check the wheel. Wheel refurbishing is at this address, and a rim that is out of round or corroded reproduces a vibration whatever the tire does.
About this store
The Denver store runs seventeen services, carries all nine Purcell tire categories, and is managed by Jake Perry, open Monday to Friday, 8:00 AM to 5:00 PM.
See the national tire and wheel balancing page for all 51 locations.

