Start with the decision that changes the outcome
DOT tire regulations matter because they define the roadworthiness baseline around condition, identification, and safe service expectations for tires in the US market.
Most shoppers do not need a law degree. They need the rule translated into real checks around tread, age, casing condition, and whether the tire is still appropriate for use.
How to narrow the field quickly
Use DOT guidance as a trust layer, not a dead-end reference page. It should help the next tire decision become safer and easier, especially for trucks and work vehicles.
Best next move
After the rule is clear, move into a size page, truck page, or state-law page to compare the right next options with context intact.