Under federal law, a low-speed electric bicycle is a two- or three-wheeled bike with fully operable pedals, a motor under 750 watts, and a top motor-only speed below 20 mph on flat ground with a 170-pound rider. A bike that fits those limits is treated as a consumer product, not a motor vehicle. That single classification, set in 15 U.S.C. § 2085, is what governs how these bikes are built, sold, and regulated — and it leaves a large amount of everyday rule-making to the states.1Office of the Law Revision Counsel. 15 USC 2085 – Low-Speed Electric Bicycles
The Four Requirements That Define a Low-Speed Electric Bicycle
Section 2085(b) sets four bright-line criteria. The device must have two or three wheels. It must have fully operable pedals so a rider can propel it by human power. Its electric motor must produce less than 750 watts, roughly one horsepower. And the motor alone, without any pedaling, must not be able to push the bike to 20 mph or faster on level pavement with a 170-pound rider aboard.
Every element counts. A bike missing working pedals fails the test even with a compliant motor. A 500-watt bike that hits 22 mph on motor power alone fails too. The 170-pound rider is written into the statute, so testing happens against that specific weight rather than an abstract speed rating. Meet all four and the bike qualifies for the lighter federal treatment Congress created when it amended the Consumer Product Safety Act through Public Law 107-319 in December 2002.2Federal Register. Requirements for Low-Speed Electric Bicycles
What a Bike Loses If It Falls Outside the Definition
The statute says a qualifying low-speed electric bicycle “shall not be considered a motor vehicle” under 49 U.S.C. § 30102.3Office of the Law Revision Counsel. 49 USC 30102 – Definitions A bike that exceeds 750 watts or breaks the 20-mph motor-only ceiling loses that shelter and can be classified as a motor vehicle. That reclassification pulls it into NHTSA’s Federal Motor Vehicle Safety Standards, with crash testing, equipment mandates, and VIN requirements, and can trigger state title, registration, insurance, and licensing rules.
The practical stakes: a compliant bike sells at a bike shop with no paperwork. A non-compliant one may not. Riders and small builders who swap in a bigger motor or unlock a speed limiter should know that the modification can move the product across a legal line the seller never intended to cross.
CPSC Safety Rules That Apply
Section 2085(a) declares low-speed electric bicycles consumer products and subjects them to the Consumer Product Safety Commission’s existing bicycle regulations at 16 CFR Part 1512. Subsection (c) gives the Commission authority to write new rules specifically for e-bikes.
Mechanical Standards
The Part 1512 rules were written for pedal bikes and now cover qualifying e-bikes on the same terms. They set requirements for braking distance, the strength of handlebars and fork assemblies, drive-chain tension, and reflectors on the front, rear, pedals, and wheels or tires.4eCFR. 16 CFR Part 1512 – Requirements for Bicycles Motorized or not, every bike sold in the U.S. must clear that structural floor.
Battery Safety
Lithium-ion battery fires have become the sharpest safety issue in the e-bike market, prompting repeated CPSC warnings and recalls over packs that ignite while charging, in storage, or sitting idle.5U.S. Consumer Product Safety Commission. CPSC Warns Consumers to Stop Using Rad Power Bikes E-Bike Batteries
The Commission has pressed manufacturers to certify electrical systems to UL 2849 (e-bike electrical systems) and UL 2272 (personal e-mobility devices) through an accredited laboratory, warning that products that fail to meet those standards “could present a substantial product hazard” under the Consumer Product Safety Act and that it would pursue corrective action.6U.S. Consumer Product Safety Commission. CPSC Letter to STPs 2849 and 2272 Both standards evaluate the motor, cells, pack, and charger together as a system.
As of early 2026, UL 2849 certification remains voluntary. The Commission voted in April 2025 to propose a rule that would largely make the UL standards mandatory, but that proposal was withdrawn and restarted after Commission changes. Legislation in Congress (H.R. 973 and S. 389) would require the CPSC to make the standards mandatory within 180 days of enactment; neither bill had been enacted at this writing. In the meantime, the CPSC continues to use its existing enforcement authority against non-compliant batteries.
Penalties
When a manufacturer or distributor knowingly violates CPSC safety requirements, each violation can draw a civil penalty of up to $100,000, capped at $15 million for any related series of violations. Each product involved counts separately, so exposure scales quickly across a shipment.7Office of the Law Revision Counsel. 15 USC 2069 – Civil Penalties The Commission can also order recalls and halt further sales.
How Federal Law Limits State Product Rules
Section 2085(d) preempts state and local product safety requirements that are more stringent than the federal standard.8Office of the Law Revision Counsel. 15 USC 2085 – Low-Speed Electric Bicycles A state cannot impose a lower wattage cap or a slower speed threshold on what counts as a low-speed electric bicycle for product safety purposes. A bike that meets the federal criteria cannot be treated as an unsafe or improperly classified product under stricter state specs.
The preemption runs one way. It blocks stricter state product-safety rules, not looser ones, and it applies only to the product safety requirements referenced in subsection (a). It does not touch traffic laws, licensing, helmet rules, or where these bikes can be ridden. Those decisions remain with the states and localities.
What the Federal Law Does Not Cover: State Traffic Rules
Section 2085 is about product classification, not the rules of the road. It says nothing about helmets, minimum ages, path access, or insurance. States and cities set those rules, and a bike that satisfies every federal safety standard can still be barred from a specific bike path by local ordinance.
Most states have moved past the federal definition by adopting a three-class system:
- Class 1: pedal-assist only, no throttle, motor cuts out at 20 mph.
- Class 2: throttle-equipped, motor cuts out at 20 mph. This is the class closest to the federal definition.
- Class 3: pedal-assist with motor help up to 28 mph, often required to carry a speedometer.
Class 3 is where friction shows up. Its 28-mph assisted speed exceeds the 20-mph motor-only ceiling in the federal definition, but because the rider is also pedaling, many states treat Class 3 as its own category rather than as a motor vehicle. Several states require Class 3 riders to wear helmets regardless of age; others draw the line at riders under 16 or 18. Age minimums for Class 3 operation commonly sit at 16, and Class 3 bikes are frequently barred from sidewalks and some shared paths that allow Class 1 and Class 2. A rider crossing city or state lines can face materially different rules on the same bike.
Federal Lands: Two Very Different Approaches
Federal land managers write their own e-bike rules on top of § 2085 and state law.
National Park Service
The Park Service allows e-bikes on park roads, parking areas, and administrative roads and trails already open to traditional bicycles, but only where the local superintendent has specifically designated e-bike access. Riding an e-bike anywhere the superintendent has not designated is prohibited. E-bikes are barred outright from federally designated wilderness areas, and superintendents can restrict or close any area to e-bikes for safety, resource, or management reasons.9eCFR. 36 CFR 4.30 – Bicycles
One rule catches riders off guard: except where motor vehicles are allowed, using the electric motor alone to move the bike for an extended period without pedaling is prohibited on NPS lands. You have to actually pedal. The regulations also adopt applicable state law for e-bike operation inside parks.
U.S. Forest Service
The Forest Service takes the opposite path and classifies all e-bikes as motor vehicles under its directives, regardless of wattage or speed. E-bikes are permitted only on roads and trails designated for motorized use. Local forest officials can open non-motorized trails to e-bikes through a Travel Management Rule designation under 36 CFR Part 212, Subpart B, but that requires environmental review and public comment.10U.S. Forest Service. Electric Bicycle Use Most non-motorized National Forest trails remain closed to e-bikes until that process is completed.
The gap matters on the ground. A rider moving from a national park trail to an adjacent national forest trail can be legal on one side and in violation on the other, on the same bike. Checking each unit’s specific designations before a ride is worth the few minutes it takes.