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Use a tread depth indicator or gauge. You can use a special tread depth indicator or gauge tool to measure your tire's tread. If you don't already own one, the gauge is cheap to purchase from an auto parts dealer and it's easy to use. You may be able to find a downloadable tread depth gauge by searching online.
In addition to tread depth, glance over the tiresâ surface for any evidence of uneven wear, cuts, embedded objects, bulges, or sidewall cracking. Every time you ride, the tires go through a âheat cycleâ as they go from ambient to operating temperature and back down again.