Just out of interest. In the US do tyres not come with the little blocks in the tread pattern that are set at the 2mm mark. Legal limit in the UK is 1.6mm so when they get near or reach the same level as the blocks you know it's time to change the tyres.
Or just buy a simple tread depth gauge. You can pick them up over here for a few pounds so I suspect you could get them in the US just as cheap. Forget about the digital ones, the mechanical ones are more accurate unless you spend a lot.
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