In almost every state, you need a motorcycle license once your engine displacement crosses 50cc. Anything above 50cc is treated as a motorcycle and requires a motorcycle endorsement on your driver’s license. Anything at or below 50cc is usually classified as a moped and can be ridden with a standard driver’s license or a dedicated moped permit, subject to age and speed rules. That one number answers the “what cc needs a license” question for the vast majority of riders, though the details around it are worth knowing before you buy or ride.
Why 50cc Is the Dividing Line
A vehicle with a 49cc engine is usually classified as a moped or motor-driven cycle. A vehicle with a 51cc engine is usually classified as a motorcycle. The one-cc gap is the difference between riding on your regular driver’s license and needing a separate endorsement, insurance, and registration.
Most states pair the displacement rule with a speed cap. To qualify as a moped, the vehicle typically has to be under 50cc and have a top speed somewhere between 25 and 35 mph. Modify a 49cc scooter to exceed your state’s moped speed limit and it can be reclassified as a motorcycle, regardless of the engine. A handful of states measure the threshold in brake horsepower rather than displacement, and at least one sets the moped ceiling as high as 130cc, but these are outliers. For almost everyone, 50cc is the number.
Your state DMV decides what license you need. Federal definitions exist for emissions and safety standards but do not control licensing, so always confirm the specifics with your local DMV before relying on a general rule.
Under 50cc: Mopeds and Small Scooters
If the engine is under 50cc, you generally don’t need a motorcycle endorsement. Most states require either a valid standard driver’s license or a dedicated moped permit. The moped permit option exists partly for riders too young for a full driver’s license, or who don’t want to go through the motorcycle endorsement process.
No endorsement doesn’t mean no rules. For a sub-50cc vehicle on public roads, you can typically expect:
- A minimum age, usually 15 or 16, though some states allow moped permits as young as 14.
- Registration and a title in many states, even though the vehicle isn’t a motorcycle.
- Liability insurance in some states and not others.
- Speed-based restrictions on where you can ride; mopeds are often banned from highways and expressways with minimum speed limits.
The word “scooter” causes a lot of confusion because it isn’t a formal legal category in most states. A 49cc scooter is regulated as a moped. A 150cc scooter is legally a motorcycle, no matter what the dealer calls it or how it’s styled. The engine size controls your legal obligations, not the marketing label.
50cc and Above: Motorcycle Endorsement Required
Once the engine crosses 50cc, nearly every state treats the vehicle as a motorcycle. You need a motorcycle endorsement, often called a Class M endorsement, added to your existing driver’s license. In some states it takes the form of a standalone motorcycle license. The same requirement applies whether you’re riding a 125cc commuter or an 1,800cc touring cruiser. There is no additional tier based on engine size once you’re in motorcycle territory.
The endorsement process generally has three parts: a written knowledge test on road rules and motorcycle-specific hazards, a vision screening, and an on-cycle skills test covering braking, turning, and handling.1National Highway Traffic Safety Administration. FMVSS Interpretation nht76-1.39 Most states will waive the riding portion if you complete a Motorcycle Safety Foundation Basic RiderCourse, which combines classroom instruction with hands-on practice.2Motorcycle Safety Foundation. Basic RiderCourse
Learner’s Permits
Before issuing a full endorsement, most states offer a motorcycle learner’s permit, sometimes called an instruction permit. Minimum ages vary; some states issue them as young as 14, with the mid-teens more common. Full endorsements are typically available between 16 and 18.
Permits come with restrictions a full endorsement doesn’t carry. Common limits include no passengers, no riding after dark, and no riding on freeways or highways. Some states require a licensed motorcycle rider to accompany you; others allow solo riding during daylight. The permit period is essentially supervised practice.
Penalties for Riding Without an Endorsement
Riding a motorcycle without the proper endorsement is a traffic offense in every state. First-time fines typically start around $200 and climb for repeat violations. Police will likely impound the motorcycle on the spot, and getting it back without a valid endorsement can be difficult. The violation adds demerit points to your driving record, which can eventually trigger a suspension of your regular driver’s license. If you cause a serious injury or fatality while riding without an endorsement, some states elevate the charge to a felony.
Three-Wheelers and Autocycles
Three-wheeled vehicles split into two licensing categories based on how you control them.
Traditional three-wheel motorcycles like the Can-Am Spyder or Harley-Davidson Tri Glide use handlebars and ride much like a two-wheeled motorcycle. Most states require either a standard motorcycle endorsement or a dedicated three-wheel endorsement to ride one. More than 30 states now offer a three-wheel-specific endorsement, often marked “3W,” that covers trikes but not two-wheeled bikes. A full Class M motorcycle license covers trikes without any extra endorsement.
Autocycles are different. These are enclosed three-wheelers with a steering wheel, foot pedals, and seat belts, like the Polaris Slingshot. Nearly every state lets you drive one on a standard driver’s license with no motorcycle endorsement, because the driving experience is closer to a car.
Electric Bikes and Kick Scooters
Electric bicycles sit in a separate regulatory category from gas-powered vehicles. Federal law defines a low-speed electric bicycle as a two- or three-wheeled vehicle with fully operable pedals and an electric motor under 750 watts, with a top speed below 20 mph on motor power alone.3Office of the Law Revision Counsel. 15 USC 2085 – Low-Speed Electric Bicycles Vehicles meeting that definition are classified as consumer products rather than motor vehicles, so no license, registration, or insurance is required under federal law.
Most states use a three-class system that builds on the federal baseline:
- Class 1: pedal-assist only, motor cuts off at 20 mph. No license.
- Class 2: throttle-powered without pedaling, motor cuts off at 20 mph. No license.
- Class 3: pedal-assist only, motor cuts off at 28 mph. No license in most states, though some restrict where Class 3 bikes can ride.
Exceed the thresholds and the bike stops being a bicycle in the eyes of the law. An e-bike with a motor over 750 watts, or one that can go faster than 28 mph on motor power alone, can be reclassified as a moped or motorcycle, which pulls in licensing, registration, and insurance requirements. Riders of high-powered custom e-bikes sometimes discover this the hard way.
Electric kick scooters, the stand-up rental type, are generally treated differently from both e-bikes and motorcycles. Most states that have addressed them don’t require a driver’s license, though age minimums and speed limits apply. Cities often layer their own rules on top of state law.
Dirt Bikes and ATVs on Public Roads
Dirt bikes and ATVs don’t require any driver’s license when used strictly off-road on private property. Licensing only comes into play when you want to ride on a public road, and the answer depends on your state’s rules for street-legal conversion.
Converting a dirt bike for street use typically means adding DOT-compliant equipment: a headlight with high and low beams, a tail light wired to both brake levers, at least one mirror, turn signals in many states, and DOT-approved tires. Once equipped, you apply for a title, registration, and insurance, like any other motorcycle. If the engine exceeds 50cc, you’ll also need the motorcycle endorsement.
ATVs face a harder path to street legality. Many states flatly prohibit ATVs on public roads, and those that allow it typically restrict them to low-speed rural roads under special permits. Equipment requirements mirror those for dirt bikes, but most ATVs aren’t designed to meet road-safety standards without extensive modification.
Quick Reference by Vehicle Type
- Gas moped or scooter under 50cc: standard driver’s license or moped permit in most states; no motorcycle endorsement.
- Scooter or motorcycle 50cc and above: motorcycle endorsement (Class M) required in every state.
- Three-wheel motorcycle (trike): motorcycle endorsement or three-wheel endorsement required in most states.
- Autocycle with a steering wheel and seat belts: standard driver’s license in nearly every state.
- Electric bicycle under 750 watts: no license required under federal and most state law.3Office of the Law Revision Counsel. 15 USC 2085 – Low-Speed Electric Bicycles
- Electric kick scooter: no license required in most states, though age restrictions may apply.
- Dirt bike or ATV used off-road only: no license required.
- Dirt bike or ATV on public roads: registration, street-legal equipment, and the appropriate license or endorsement required.