Can every tech working in your shop or driving your mobile units demount and mount a medium truck tire by the book? Doing so, and without a mistake, is not what it was 15 years ago. To put it more accurately, it is becoming what it was once intended to be but wasn't: a procedure requiring time and training. A simple tire replacement is no longer so simple. Whether describing that procedure verbally or in writing, or physically doing the work, it is easy to overlook a step or two along the way. There are so many aspects involved.
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