Is There Such a Thing as a Class 4 E-Bike?

Manufacturer, retailer and public-agency sources · 2026-09-24 · no ratings, no road tests

Summary

The federal e-bike definitions and the three-class system that many U.S. states use end at Class 3, pedal assist up to 28 mph, and none of them includes a Class 4. Sellers and forums use the label for machines whose motors run past 750 watts or whose assist continues beyond 28 mph, and those numbers put the machine outside the e-bike definitions altogether. On Bureau of Land Management land such a machine is managed as an off-highway vehicle, and on public roads your state's vehicle law decides what it is.

Where the e-bike definitions stop

The Bureau of Land Management's rule is a clear example of the usual limits. It defines an e-bike as "a bicycle with a small electric motor of not more than 750 watts (one horsepower)" that "must have fully operable pedals," and then sorts those bikes into three classes. Class 1 and Class 3 bikes assist only while the rider pedals, up to 20 mph and 28 mph. A Class 2 bike can be moved by the motor alone, up to 20 mph.

Nothing sits above Class 3 in that scheme. A CPSC staff report on bicycle standards makes a related point about the classes themselves: "Although not defined in any standard, the market and many states" sort e-bikes into three classes. Class 4 does not appear in either document.

Wattage and class answer different questions

Class describes how the motor assists and at what speed it stops. Motor power is a separate number, and a 750-watt bike can be set up as Class 1, 2 or 3 depending on whether it has a throttle and where assist cuts off. Some bikes let the owner switch between classes in a menu or an app.

The federal consumer-product rules draw yet another line. CPSC's bicycle regulation, 16 CFR 1512, covers two- or three-wheeled vehicles with fully operable pedals and a motor "of less than 750 watts (1 horsepower)," whose top speed on motor power alone, with a 170-pound rider on a paved level surface, "is less than 20 mph." That definition decides which product safety rules apply to the bike. It does not decide where you may ride.

What happens on public land above Class 3

The BLM rule "applies only to Class 1, 2 and 3 e-bikes," and the agency says that everything else, "e-bikes that provide assistance at speeds above 28 mph or wattage of greater than 750," continues to be managed as an off-highway vehicle under 43 CFR Part 8340. A machine sold as a Class 4 e-bike is, on BLM land, an OHV.

Even a legal Class 1 bike does not get onto every trail automatically. The BLM says its rule "does not, by itself, open any non-motorized trails to e-bike use," and e-bikes may use trails limited to bicycles and non-motorized travel only where a BLM manager has issued a written decision allowing it. The National Park Service leaves the same kind of call to each park's superintendent.

Reading a listing that says Class 4

The label tells you little, so the specification has to do the work. The numbers that decide the category are the rated motor power in watts, the speed at which assist stops, whether the motor can propel the bike without pedaling, and whether the pedals are fully operable. A listing that gives 1,500 watts and a 40 mph top speed is describing something beyond every class in the BLM definition, whatever the product title calls it.

Sources

Data checked, sources, and what we did not test

Data checked: 2026-09-24. Figures and quotations were read on that date from the pages listed under Sources and can change without notice.

Sources: manufacturer, retailer and public-agency pages, listed above. No review sites, forums or retailer ratings were used.

What we did not test: ride quality, brake feel, real-world range, durability and customer service. We have not ridden these bikes and publish no ratings or rankings.