With year-round riding weather and a deep custom culture, it is no surprise that so many bikes on Arizona roads have been personalized, louder pipes, taller bars, custom lighting, a stripped-down rear end. The problem is that plenty of mods sold as simple bolt-on upgrades are not actually street legal here, and many riders find that out the hard way.
Whether it is through a citation, or worse, when an illegal modification gets used against them after a crash, installing an illegal motorcycle mod can complicate a rider’s ability to recover compensation for an accident.ย
1. Loud Exhausts and Muffler Cutouts
The single most-cited modification, under ARS 28-955.01, a motorcycle must be equipped with the manufacturer’s original muffler, or a replacement capable of keeping noise below the maximum levels set by federal standard 40 CFR 205.152. The statute also specifically prohibits using a muffler cutout, bypass, or similar device on any motorcycle operated in the state.
The rule exists because straight pipes and cutouts do not just annoy neighbors, they can drown out the traffic cues a rider needs and contribute to noise pollution that has drawn increasing enforcement. A violation typically brings a civil penalty, and exhaust and emissions citations under ARS 28-955 start at a fine of at least $100, though correcting the problem can sometimes reduce or resolve the fine.
2. Ape-Hanger and Tall Handlebars
That classic high-bar look has a legal ceiling in Arizona. Under ARS 28-964, a motorcycle’s handlebars or grips cannot be positioned so that the operator’s hands are above shoulder height when seated on the bike.ย
As ape hangers force you to reach up past your shoulders cross the line, handlebars that high reduce leverage and steering control and accelerate arm fatigue, all of which can be the difference in an emergency swerve. With that in mind, equipment violations under ARS 28-964 carry a civil penalty starting at $100 and if it causes an accident, it can potentially hold motorcyclists accountable for damages.ย
3. Removed Rearview Mirror
Stripping mirrors off for a clean look is a popular custom move and an illegal one. Arizona requires a motorcycle to have at least one rearview mirror that gives the rider a clear view of the road behind. Lose your rear awareness and you lose one of the few tools a motorcyclist has against being rear-ended, a frequent and dangerous crash type. This falls under Arizona’s motorcycle equipment requirements and is treated as an equipment violation.
4. Illegal Lighting Modifications
Custom lighting is one of the most common ways riders personalize a bike, and one of the easiest ways to end up illegal. Arizona’s vehicle equipment statutes (ARS 28-921 through 28-966) regulate lamp colors, placement, and which lights are required. The frequent offenders:
- Red or blue lights visible from the front, which are reserved for emergency vehicles
- Flashing or strobing lights that imitate police
- Underglow in restricted colors
- Removing or disabling required headlights, tail lights, or brake lights
The safety logic is straightforward, because non-standard colors confuse other drivers about what they are looking at, and a motorcycle is hard enough to see at night without missing or dimmed required lighting.ย
5. Removing a Required Brake
Here is an Arizona-specific quirk worth knowing. Arizona law requires a motorcycle to have at least one functioning brake, fewer than some states demand. But “only one required” does not mean you can disable or remove braking equipment for a custom build and stay legal. A bike that cannot stop reliably is a hazard to everyone, and missing or non-functional braking equipment is an equipment violation that also hands an insurance company an easy argument about your role in any collision.
6. Exhaust Tampering and Emissions Defeat Devices
Arizona takes emissions seriously, especially in the Phoenix and Tucson metro areas where vehicle emissions testing is required. Under ARS 28-955, mufflers and emissions-control equipment must be kept functional, and tampering with emissions-control devices is prohibited. ARS 28-955.04 adds exhaust-system inspection requirements with their own civil penalties.
While a basic exhaust swap is not automatically illegal, removing or defeating emissions equipment is, and it can escalate beyond a simple civil penalty. Tampering with an emissions-control device can rise to a Class 2 misdemeanor, a criminal charge, not just a fine. Federal law independently prohibits emissions tampering as well.
7. Missing Passenger Seat or Footrests
If you have ever modified your bike into a solo-seat configuration and then carried a passenger anyway, that is a violation. Under ARS 28-964, a motorcycle carrying a passenger must be equipped with a seat and footrests for that passenger. Beyond the ticket, a passenger riding without proper footrests is far more likely to be injured or to destabilize the bike.
8. Shatter-Prone Custom Windshields and Removing Eye Protection Equipment
Arizona requires motorcycle operators to wear eye protection, glasses, goggles, or a face shield, unless the bike is equipped with a proper windshield, under ARS 28-964. Swapping in a custom windshield made of cheap material that can shatter on impact, or relying on a non-compliant windshield in place of eye protection, undermines that requirement. Flying debris at speed can blind a rider in an instant, which is exactly what the rule guards against.
Why an Illegal Mod Can Quietly Shrink Your Crash Settlement
Most riders think the worst-case outcome of an illegal mod is a fix-it ticket. The bigger financial risk shows up if you are injured in an accident, and it works differently in Arizona than in many other states.
Arizona follows pure comparative negligence under ARS 12-2505. Under this rule, you can recover damages even if you were mostly at fault, but your recovery is reduced by your percentage of fault. So unlike states that bar recovery once you cross a fault threshold, Arizona will still let an injured rider recover, just less.
That is precisely where an illegal modification hurts you. After a crash, the at-fault driver’s insurer will comb your bike for anything off-spec and argue that the modification contributed to the collision or to the severity of your injuries. Every percentage point of fault they can shift onto you directly reduces your payout and in a serious injury case, that can mean tens of thousands of dollars evaporating because of a mod that cost you a hundred-dollar ticket.ย
Don’t Let a Custom Bolt-On Become the Other Driver’s Defense
A modification that earned you a citation is not the same thing as a modification that caused a wreck, but you can count on the insurance company to blur that line. After an Arizona motorcycle crash, the fight is often less about who hit whom and more about how much fault the other side can pin on your bike instead of their driver. That is a fight worth having with someone in your corner who knows how it works.
The team at West Coast Trial Lawyers has recovered more than $1.7 billion for injured people, with trial attorneys like former federal prosecutor Neama Rahmani leading the way. Our Arizona motorcycle accident attorneys understand how insurers use a rider’s customizations to chip away at a claim, and we build cases that keep the blame where it belongs.ย
Reach us anytime at (213) 927-3700ย for a free, no-obligation case review, and remember, you pay nothing unless we win.
