Are Steering Wheel Knobs Illegal? State Laws & Safety Facts
The short answer: steering wheel knobs are legal in most states for regular drivers. They’re specifically protected for drivers with disabilities under federal law. But a few states restrict or ban them for non-disabled drivers, so you’ll want to check your local rules.
What Are Steering Wheel Knobs?
Steering wheel knobs — also called spinner knobs, suicide knobs, or brodie knobs — attach to your steering wheel rim. They let you turn the wheel with one hand using a spinning motion. You’ve probably seen them on forklifts, tractors, or older trucks.
They come in a few styles: a simple knob that clamps on, a flip-up version that folds away, and models with built-in controls for lights or wipers. Most cost between $15 and $50.
Federal Law Protects Disabled Drivers
Here’s the big one: the National Highway Traffic Safety Administration (NHTSA) explicitly allows spinner knobs for drivers with disabilities. This falls under Federal Motor Vehicle Safety Standard 101. If you have a legitimate medical need, no state can ban you from using one.
You’ll typically need a doctor’s note and a restriction on your license. The process varies by state, but the protection is federal. Don’t let anyone tell you otherwise.
State-by-State Breakdown
Most states don’t mention steering wheel knobs at all in their vehicle codes. That means they’re legal by default. But some states have specific rules:
- California: Legal for all drivers (CVC 26708)
- New York: Legal with no restrictions
- Texas: Legal for all drivers
- Florida: Legal for all drivers
- Washington: Restricted — only for drivers with disabilities (RCW 46.37.500)
- Oregon: Restricted to disabled drivers only
- Minnesota: Banned for non-disabled drivers
- Michigan: Legal but must not obstruct driver’s view
Laws change. Always check your state’s current vehicle code or DMV website before buying.
Why Do Some States Restrict Them?
Good question. The concern isn’t the knob itself — it’s how people use them. Critics argue knobs encourage one-handed driving at speed, which reduces control in emergencies. There’s also the “suicide knob” nickname from the 1950s, when hot rodders used them for sharp turns and the knob could catch clothing.
Modern knobs are safer. They’re designed to release under pressure and don’t snag like old models. But the reputation sticks in some legislative offices.
Safety Considerations You Should Know
If you’re not disabled, should you use one? For most daily driving, a knob adds convenience — especially for parking, tight U-turns, or backing a trailer. But there are trade-offs.
Airbags are the main concern. A knob on the wheel rim can interfere with airbag deployment or become a projectile in a crash. Some manufacturers warn against them for this reason. If your car has a driver’s airbag (pretty much everything since the late ’90s), check your owner’s manual.
Also, knobs can encourage lazy steering habits. You lose the hand-over-hand technique that gives you maximum control in a swerve or slide. Track drivers and driving instructors almost never use them.
Who Actually Benefits From a Spinner Knob?
Drivers with limited mobility in one arm or hand. People with arthritis, stroke recovery, amputations, or nerve damage. For these folks, a knob isn’t convenience — it’s independence.
Commercial drivers sometimes use them for low-speed maneuvering: delivery trucks, buses, garbage trucks. But many fleets ban them on highways.
Off-roaders and farmers like them for slow, technical driving where you’re constantly turning lock-to-lock. On the highway? Not so much.
How to Install One Properly
Don’t just clamp it on and go. Position the knob at 10 o’clock or 2 o’clock — never at 12 o’clock where it blocks the airbag cover. Tighten it until it absolutely cannot move. Test it in a parking lot before hitting traffic.
Remove it if you’re selling the car or letting someone else drive. And please, don’t use a cheap plastic one from a gas station. Spend the extra $10 on a metal core with a quick-release mechanism.
FAQ
Are steering wheel knobs illegal in California?
No. California Vehicle Code 26708 explicitly allows them for all drivers. No disability requirement.
Can I get a ticket for using a spinner knob?
Only if you’re in a state that restricts them (like Washington or Minnesota) and you don’t have a disability exemption. Otherwise, no.
Do steering wheel knobs void my insurance?
Not typically. But if you’re in a crash and the knob contributed — say it interfered with the airbag — your insurer might deny the claim. Check your policy.
Are they called “suicide knobs” for a reason?
Old-school knobs from the ’50s could catch a driver’s sleeve during a fast turn, yanking their arm. Modern designs don’t have this problem. The name stuck anyway.
Can I use one on a car with an airbag?
You can, but it’s not recommended. The knob can alter airbag deployment or become dangerous shrapnel. Many owner’s manuals specifically warn against aftermarket steering wheel attachments.
Bottom Line
Steering wheel knobs are legal for most people in most states. If you have a disability, you’re federally protected. If you don’t, check your state law — and think hard about whether the convenience outweighs the airbag risk. For parking a trailer or navigating a job site? Great tool. For daily highway driving? Your two hands on the wheel at 9 and 3 is still the gold standard.