Picture a rider showing up at a trailhead on a shiny new e-bike, only to be told it isn’t allowed. The motor was fine. The class was wrong.
That one small label decides where you can ride, how fast the motor helps, and sometimes how old you need to be. I’d read it before I looked at battery size or paint color.
The three classes in plain terms
US e-bike classes sort bikes by throttle and top assisted speed. Class 1 and Class 2 stop helping at 20 mph. Class 3 stops at 28 mph.
All three share one power ceiling: a motor of 750 watts (1 horsepower) or less, with working pedals. California words it slightly tighter, at under 750 watts. Colorado’s e-bike rules say 750 watts or less.
Most states use this three-class system, which is why a Class 2 bike means roughly the same thing in Ohio and Oregon. Age, helmet and trail rules still change at the state line. Check yours before you buy. I use California and Colorado as examples below because their rules are easy to pin down.
Class 1: pedal-assist to 20 mph
The motor helps only while you pedal, and it fades out at 20 mph. Stop pedaling and the motor stops too. You can ride faster than 20 mph on your own legs, but the motor adds nothing up there.
This is the class that feels most like a regular bike. It’s also the one I’d point trail riders to. Colorado allows Class 1 and 2 e-mountain bikes on trails in every state park that permits mountain biking.
Class 2: throttle plus assist to 20 mph
A Class 2 bike can move with a throttle, with or without pedaling. The motor still cuts out at 20 mph. Most Class 2 bikes also have pedal assist.
The throttle drains the battery faster if you lean on it without pedaling. Some states and trails also limit throttle use, so check before you plan a ride.
I’d steer first-time riders, people with sore knees, and anyone who stops and starts a lot toward Class 2. A throttle makes a restart on a hill much easier. Confirm the class on the spec sheet, since step-through commuters and utility bikes come in all three.
Class 3: pedal-assist to 28 mph
Class 3 is the fast one. It assists only while you pedal and stops at 28 mph. Colorado also requires a speedometer.
Throttles cause confusion here. State definitions describe Class 3 as pedal-assist only. Some brands add a throttle that quits at 20 mph, so a bike can be sold as Class 3 with a thumb throttle. Read the label, not the ad copy.
One model can even land in two classes. Momentum sells its Vida E+, with a 500 W motor and 700 Wh battery, as a Class 3 bike or as a Class 2 bike with an optional throttle. It lists at $1,600. Prices as of October 2026.
I’d pick Class 3 for road commutes of about 10 miles or more, where keeping up with traffic matters. I’d skip it if your route is mostly multi-use paths, because those are often closed to it.
Side by side
| Feature | Class 1 | Class 2 | Class 3 |
|---|---|---|---|
| Assist cuts out at | 20 mph | 20 mph | 28 mph |
| Throttle | No | Yes, works without pedaling | No in state definitions; some brands add a 20 mph throttle |
| Motor limit | 750 W | 750 W | 750 W |
| Speedometer | Not required | Not required | Required in Colorado |
| Minimum age (California) | None | None | 16 |
| Helmet (California) | Under 18 | Under 18 | All riders and passengers |
| License, registration, plate | Not required | Not required | Not required |
| Path and trail access | Like a regular bike, local rules apply | Like a regular bike, local rules apply | Roads and bike lanes; paths and trails often closed |
| Best for | Trails, mixed riding | Errands, easy starts, mobility | Long road commutes |
Colorado’s rules differ a little from California’s. Colorado sets the Class 3 minimum age at 16 and requires a helmet only under 18. California requires a helmet for every Class 3 rider.
How I’d choose
Start with your route, not the spec sheet. Where you ride decides how much of a class you can actually use.
- Dirt trails or shared paths: Class 1.
- First e-bike, errands, hilly starts, or a throttle for comfort: Class 2. It also tends to cost less than Class 3.
- Road commute of 10 miles or more: Class 3, and expect a higher price and more rules.
If you’re not sure an e-bike is even the right kind of bike, our guide to which bicycle type you should buy is a good place to start.
Building one instead of buying? The class comes from what the finished bike does, so check a kit’s motor wattage and speed cap first. Our e-bike conversion kit roundup is from 2023, so verify current specs before ordering.
When an e-bike isn’t an e-bike
A bike with a motor above 750 W, or assist beyond 28 mph, falls outside the three classes. Colorado calls these electric mopeds, electric motorcycles or e-motos, and its definitions bar selling them as e-bikes.
California sorts them into heavier categories, and the DMV rules are stricter:
- Motor-driven cycle: a motorcycle under 150 cc. It needs registration and a motorcycle license, and it can’t use controlled-access freeways.
- Moped or motorized bicycle: capable of no more than 30 mph on level ground. It also needs registration and a motorcycle license, and may use bike lanes only where a local ordinance allows.
- Zero-emission motorcycle: no pedals, motor power only. It must be registered and stays out of bike lanes.
Looks don’t decide it. A fat-tire bike styled like a small motorbike still counts as a bicycle if it has working pedals and fits the class limits. Gray-area bikes sold with an “off-road” mode listed at “28+ mph” are murkier, and CalBike says it’s unclear whether those qualify in California.
Check the label before you buy. California has required a permanent label showing class number, top assisted speed and motor wattage since 2017. If a seller can’t show all three, I’d treat the bike as a moped until proven otherwise.
Raising a speed cap with a controller change pushes a bike out of its class. Our guide on how to modify an e-bike controller covers the how-to. Weigh the legal side first.
What changes in California on January 1, 2027
Gov. Gavin Newsom signed SB 1167 on September 30, 2026. It takes effect January 1, 2027. The Class 1, 2 and 3 definitions stay put, along with the 750 W cap and the 20 and 28 mph limits. The CalBike summary of the signing is a quick read.
What shifts is labeling and selling:
- Every e-bike sold in the state must carry an easy-to-read label showing its class and top assisted speed.
- Anything beyond the legal limits can’t be advertised or sold as an e-bike.
- Sellers of faster or more powerful machines, online included, must tell buyers they are motor vehicles that need registration, an operator license and insurance.
In practice, a listing with no class and top-speed label deserves questions from January 1. So does a speedy “e-bike” that skips the license warning. Our California e-bike laws guide covers the rest of the state’s rules.
Illinois is moving too. SB 3484 takes effect January 1, 2027. It keeps the three classes, sets a minimum age of 15 for Class 1 and 2, and treats e-bikes above 750 W as motor-driven cycles.
Where each class can ride
Roads, bike lanes and paths
California bars cities from restricting e-bikes on bicycle paths, bikeways and bike lanes. On roads, e-bike riders follow the same Vehicle Code rules as cyclists. Local authorities can still close equestrian and hiking trails, and the state parks department can ban any class on paths it manages.
In Colorado, Class 1 and 2 bikes can generally go wherever a regular bike can, though local governments have the final say.
Class 3 access
Class 3 carries the most rules. California requires riders to be 16 or older, with a helmet for every rider and passenger.
Colorado is more specific. Riders under 16 can’t operate a Class 3 bike, though they can ride as a passenger on one built for it. Helmets are required under 18. These bikes stay on roads, bike lanes and bike infrastructure within the roadway. Bike paths and multi-use trails are off limits unless the trail runs within the street or the local government allows it.
Trails and public land
Colorado allows Class 1 and 2 e-mountain bikes in all 42 state parks that permit mountain biking. City and county trail rules vary a lot, so ask the land manager before you hit singletrack. If the rules are unclear, stay off the dirt.
On federal land, e-bikes are allowed on nearly 40% of trails in national forests and grasslands. The National Park Service restricts them in wilderness areas and may add rules elsewhere in national parks. Check with the Forest Service, the Bureau of Land Management or the park first. We’ll cover this in more detail in our guide to e-bike trail access.
Quick answers
Class 1 or Class 2: what’s the difference?
The throttle. A Class 2 bike can run without pedaling, and a Class 1 can’t. Both stop assisting at 20 mph and get similar path access. If you want a throttle for starts or mobility, buy Class 2.
Class 2 or Class 3?
I’d go Class 2 for a throttle, wider access and a lower price. I’d go Class 3 if your commute runs 10 miles or more on roads or bike lanes. For a first bike, Class 1 or 2 is easier, because the access rules are looser.
Are Class 3 e-bikes legal in Colorado?
Yes. Colorado’s statute (Section 42-1-102 (28.5), C.R.S.) defines them. Riders must be 16 or older, with a helmet under 18, and the bike needs a speedometer.
Is there a Class 4?
No. California and Colorado law stop at Class 3. Anything beyond 750 W or 28 mph is an electric moped or motorcycle.
Do I need a license, registration or insurance?
Not for an e-bike in California or Colorado. California riders need no operator’s license, registration, motor vehicle insurance or plate. Mopeds and motorcycles follow different rules, as covered above.
How do I tell which class my bike is?
Look for the label. California requires class number, top assisted speed and motor wattage on a permanent label. Colorado requires a label showing every class the bike can reach, or the highest one. If a brand skips the class on its site, compare the spec sheet with the definitions above or ask the shop. For more on how California sorts bikes, see CalBike’s classification guide.
