Wheel & Tire Protrusion Laws: Everything You Need to Know
If you've ever wondered whether that aggressive wheel-and-tire setup poking past your fenders will get you a fix-it ticket, the answer depends entirely on which state line you're standing behind. Wheel and tire protrusion — tires extending beyond the fender or body line — is one of the most inconsistently regulated areas of vehicle equipment law in the country.
Across all 50 states, 30 states have no protrusion restriction at all for passenger vehicles, 19 states impose some kind of conditional fender-coverage or spray-control requirement, and just one state, New Jersey, bans tire protrusion outright. That split tells an important story: most states never wrote a protrusion rule into law in the first place, while a sizable minority regulate it indirectly through splash-and-spray or fender-coverage requirements rather than a simple "inches beyond the fender" number.
See the full 50-state comparison
The Legal Majority: No Protrusion Rule at All
Thirty states — including Wheel & Tire Protrusion in Texas, Wheel & Tire Protrusion in Florida, Wheel & Tire Protrusion in Michigan, and Wheel & Tire Protrusion in New York — simply have no statute addressing fender coverage or tire protrusion for passenger cars. In most of these states, the only width-related restriction that applies is the general vehicle width cap (commonly cited at 8 feet 6 inches in states like Alabama, Indiana, and Michigan), which governs overall vehicle width rather than how far a tire sits relative to the fender.
This group includes Alabama, Arizona (for passenger cars specifically — splash guards apply only to trucks, trailers, buses, and modified pickups), Arkansas, Colorado (which expressly exempts passenger vehicles and light trucks from its splash-guard statute), Delaware, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maine, Michigan, Minnesota (whose flap rule targets trucks and trailers, not cars), Mississippi, Missouri, Nevada, New Mexico, New York, North Carolina, Ohio, South Carolina, South Dakota, Tennessee, Texas, Virginia, West Virginia, Wisconsin, and Wyoming.
A pattern worth noting: several of these states — North Carolina and South Carolina among them — do regulate fender height (limiting how much taller a front fender can be than the rear), but that's a separate anti-squat rule and has nothing to do with tire protrusion.
The Conditional Middle Ground: Spray Control, Not Inches
Nineteen states fall into the "conditional" category, and almost all of them share a common structure: they don't cap protrusion in inches, but they do require some form of fender, flap, or splash apron to control spray and debris thrown by the tire. This is a meaningfully different kind of law than an outright protrusion ban — it regulates what's behind the tire, not how far the tire sticks out.
States requiring general spray-reduction devices include Alaska, California, Connecticut, Montana, Nebraska, New Hampshire, Oklahoma, and Washington. For example, Wheel & Tire Protrusion in Alaska requires "a device that effectively reduces wheel spray and splash to the rear, extending down to within 14 inches of the ground," per 13 AAC 04.265 — but sets no limit on protrusion itself. Similarly, Wheel & Tire Protrusion in Washington mandates fenders, covers, flaps, or splash aprons that are "at least as wide as the tire behind which it is mounted, extending downward at least to the center of the axle" under RCW 46.37.500.
States with geometric fender-coverage tests are stricter in practice, even without a numeric protrusion limit. Wheel & Tire Protrusion in Idaho requires fenders or covers over all wheels, "extending the full width from a point above and forward of the tire center over and behind the wheel, reaching within 20 inches of the road (10 inches for trucks, buses, and trailers)," per Idaho Code § 49-949. Wheel & Tire Protrusion in Oregon requires "Type III fenders on each axle, full width over the tire, reaching within 27 inches of the road," per ORS 815.182. And Wheel & Tire Protrusion in Hawaii will fail a vehicle at inspection unless fenders "cover the entire width of the tire tread viewed from above and cover the tire from vertical to 75 degrees rearward," under HAR § 19-133.2-35.
Modified-vehicle-specific rules appear in North Dakota and Vermont, both of which require fenders on altered vehicles to "cover the entire tire tread width, 15 degrees forward to 75 degrees rearward of the wheel centerline." North Dakota adds that "the tire may never contact the body, fender, or chassis" (N.D. Admin. Code § 37-12-02-02(4)), while Vermont's inspection manual fails any vehicle where "a fender fails to cover the tread portion of the tire" (Code Vt. R. 14-050-022).
Two states explicitly permit protrusion as long as spray control is in place. Wheel & Tire Protrusion in Massachusetts "expressly permits tires to extend beyond the fenders or body — it just requires flaps or suitable guards when they do" (Mass. Gen. Laws c. 90, § 7; 540 CMR 4.04(12)(b)). Rhode Island takes a nearly identical approach, barring passenger vehicles from operating "with tires extending beyond the fenders or body unless it also has flaps or suitable guards reducing spray to the rear and sides" (R.I. Gen. Laws § 31-23-26).
Other conditional states — Louisiana, Maryland, Pennsylvania, and Utah — round out the group with their own fender-coverage or mudguard specifications. Louisiana's statute is notably flare-friendly, explicitly naming "fender flares" as an acceptable way to meet its width requirement (La. R.S. 32:364). Maryland, by contrast, uses a strict geometric inspection test: "rear fenders must reach down to the wheel's horizontal centerline, and front fenders must extend forward within 45 degrees of that centerline" (COMAR 11.14.02.08).
The One State Where It's Illegal: New Jersey
Wheel & Tire Protrusion in New Jersey stands alone as the only state with an outright ban. New Jersey's regulations state plainly that "tire tread may not protrude beyond the fenders, and fenders must cover the width of the tire tread." The rule does leave a workaround: "fender flaps or flares may be added to provide the needed coverage," per N.J.A.C. 13:20-32.19 and 13:20-32.33(b). In practice, that means New Jersey drivers running wider wheels and tires need flares wide enough to bring the fender line back out to the tread width — there's no way around the coverage requirement itself.
What This Means for Builders and Buyers
If you're planning a wheel-and-tire upgrade that pushes past stock width, the practical takeaway is this: most of the country won't stop you, but a meaningful number of states will require you to manage spray and debris with flaps, aprons, or wider fenders — and New Jersey requires full coverage no matter what. Since these rules are enforced at the state level (often at annual inspection rather than roadside), it's worth checking your specific state's exact statute before finalizing a build, especially if you're near a state line or planning to register the vehicle somewhere new.
Every state page has the exact limits, statute citations, and exceptions — free.
This guide was compiled using AI-assisted extraction from state statutes and administrative codes. While every effort has been made to verify accuracy against primary sources, laws change and interpretations vary by jurisdiction. Always confirm current requirements with your state's motor vehicle authority or a qualified professional before modifying your vehicle.