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Are Arch Extensions Legal in the US?

Legal

Arch extensions (fender flares) are legal in the US. No state bans them, and in many states they actively solve a compliance problem, because tires that stick out past the bodywork are required to be covered.

Why?

Fender flares are one of the most common truck and off-road accessories in the country, and they are road-legal everywhere. A number of states have tire-coverage rules requiring the tread of each tire to be covered by the fender line, so on a truck or car running wider wheels, bolting on flares is often exactly what makes the setup legal.

The requirements that do exist are about safety of the part itself: flares must be securely attached, must not have sharp or protruding edges that could injure a pedestrian or cyclist, and must not obscure any lights or reflectors. Riveted or bolted flares that follow the body line meet this easily.

The only edge case is extreme width. States set an overall vehicle width limit (commonly 102 inches, aimed at commercial vehicles), and a passenger car will never approach it, but a heavily widened show build should keep total width in mind. For any normal flare or extension kit, this is a straightforwardly legal mod.

What decides if it's legal

  • Fender flares are legal to fit in every state.
  • Several states require the tire tread to be covered by the fender or flare.
  • Flares must be securely mounted with no sharp or dangerous edges.
  • Very wide setups can run into state overall-width limits.

Does it depend on your state?

Only in the helpful direction: states with tire-coverage rules effectively require flares once your wheels poke past the body, while other states leave exposed tires alone. The flares themselves are legal in all of them.

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Sources

This page is general guidance, not legal advice, on the rules in the US for arch extensions. The detail varies by exact vehicle and changes over time - confirm with your insurer and the EPA, NHTSA and your state DMV before modifying.