Roadsmart 3 vs 4?

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Hopefully you can find a shop. I have a NoMar Classic. But every time we're at VIR, I lust over the Coats changers lined up under the Dunlop tent.

Back before mag wheels were common, changing a car or light truck tire was a breeze.  Pull the valve stem to deflate the tire, then press the pedal to activate the pneumatic beam breaker.  Insert one end of the lever bar under the lip of the bead, then rotate to place the opposite end over the center post.  Press a different pedal and the center post rotates the lever bar around, lifting the bead over the rim.  Repeat for the other bead and the tire is off the wheel.  Installing a tire was just as simple, but you used the duckhead feature on the lever bar to guide the bead over the rim.  The machine rotated the bar.  Install a new valve stem, then mount the remaining bead.  Inflate the tire to seat the bead.  The process took about 5-minutes.

No one cared an iota about scratches on those old steel rims..........