Discount Wheels And Tires Speedometers Calibrated When Bigger Wheels Are Installed By Tire Shops?

Speedometers calibrated when bigger wheels are installed by tire shops? - discount wheels and tires

I noticed that many cars drove luck with aftermarket wheels and purchased from Discount Tire, etc. I know that, whenever you increase or decrease the diameter of the original shake the speedometer. This is the distance of places for tires for free? Or are they simply "push" their products as quickly as possible, so that someone noticed? I know that the sale of these devices are calibrated, but she with?