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Electric Bikes & Scooters

Documentation for CEMOTO commuter, mountain, fat-tire and folding eBikes, plus the EM11 three-wheel scooter.

Which model do I have?

CEMOTO's eBike line is sold under several overlapping naming conventions. The table below maps the store listing to the name printed on the product.

Store listing Also known as Category
cemoto-eb40-electric-city-commuter-bike EB40 Step-thru city commuter
aeb31-city-commuter-eBikes AEB31A Step-thru city commuter
cemoto-eb28a-emountain-bike B28 / EB28 27.5" mountain eBike
cemoto-fat-tire-eBike-eb28a B28A / AEB28A / EB28A High-step fat-tire eBike
fat-tire-mountain-eBike B28D / EB28D 26" folding fat-tire mountain eBike
eb66-harley-like-hi-tech-eBike EB66 / B66 Motorcycle-styled fat-tire eBike
— B57A Folding eBike (manual only)
— EM11 Three-wheel scooter (manual only)

Why the naming is confusing: the same physical bike appears in the store under a marketing name (EB40, EB66) and in internal/manual naming (B28A, AEB28A). Where the manuals use a different designation from the store listing, this documentation notes both.

Model line-up

Tap a model to open its full specification page.

EB40
EB40 		AEB31A
AEB31A 		B28
B28 		B28A
B28A 		B28D
B28D 		EB66
EB66

Model line-up at a glance

Model Motor Battery Top speed Wheels / tires Brakes
EB40 750W BLDC 48V 15Ah 20 mph 26×1.95 KENDA Hydraulic disc
AEB31A Not published Not published Not published Not published Not published
B28 500W brushless 48V 13Ah 20 mph 27×2.35 all-terrain Disc
B28A 750W BLDC 48V 15.6Ah 20 mph (listed 28 mph max) 26×4.0 CST Hydraulic disc
B28D 750W (1,500W max) 48V 15.6Ah 20 mph 26×4.0 CST Hydraulic disc
EB66 750W BLDC 48V 15Ah ×1 or ×2 20 mph 20×4.0 KENDA Tektro disc

⚠ Conflict notice — published topTop speed. CEMOTO'sEvery specCEMOTO tableseBike stateships configured to a maximum speed of 20 mph maximum for every eBike model, which is, the U.S. Class 2 limit. However,Some severalmodels productcan descriptionsbe set higher through the display's speed-limit parameter — the P-Setting Guide covers this. A higher setting may take the bike outside the Class 2 definition, with consequences for where it may legally be ridden, and marketing bullets advertise higher figures (for example 28 mph for the B28A). Treat 20 mph as the compliant/street-legal configuration and confirm the actual setting with CEMOTO before relying on any higher figure.insurance. See Riding Laws & Compliance.

Shared platform characteristics

Most CEMOTO eBikes share a common component set:

  • Drivetrain — SHIMANO 7-speed derailleur gearing.
  • Charger — 54.6V 2A, UL-listed, which is the correct charger for a 48V (13S) lithium pack.
  • Frame — 6061 aluminum alloy on most models (the EB66 uses carbon steel).
  • Load capacity — 120 kg on every model with a published rating.
  • Display — color LCD, 4 inch, on most models.
  • Fork — alloy suspension, "Lo" travel designation.

Documentation by model

Model Page Manual
EB40 EB40 City Commuter See eBike Manuals
AEB31A AEB31A City Commuter See eBike Manuals
B28 B28 Mountain eBike See eBike Manuals
B28A B28A Fat Tire eBike See eBike Manuals
B28D B28D Folding Fat Tire See eBike Manuals
EB66 EB66 Dual Battery See eBike Manuals
B57A — B57A User Manual (PDF)
EM11 — EM11 User Manual (PDF)

eBikes vs. D-series dirt bikes

These are different product categories with different rules.

eBikes (this section) D-series dirt bikes
Intended use On-road and improved trail Off-road, private land and closed tracks only
Legal status (US) Designed to Class 2 limits Not street-legal
Pedals Yes — throttle + pedal assist No — footpegs and twist throttle
License/registration Generally not required for compliant Class 2 use Varies; often requires registration and a license for off-road vehicle use
Helmet Strongly recommended; required by law in many jurisdictions Mandatory

Do not assume that guidance written for one category applies to the other. In particular, D-series dirt bikes must not be ridden on public roads.

Safety fundamentals

The B57A owner manual — which covers the shared CEMOTO eBike platform — sets out the baseline rules that apply across the whole eBike range:

Before every ride, check the bike, brakes, tires and screws/nuts for tightness.

  • NEVER carry a passenger on the electric bike.
  • NEVER modify the electric bike with unapproved accessories.
  • NEVER ride through deep water.
  • NEVER perform wheelies, jumps or trick stunts.
  • AVOID riding in the rain for long periods of time.
  • AVOID water contact with the motor and electric lines.
  • ALWAYS keep both hands on the handlebars.
  • ALWAYS apply brakes lightly when riding on rocks or loose surfaces.
  • ALWAYS use caution when going through puddles.
  • ALWAYS inspect the electric bike before each ride to ensure a safe ride.

Who should not ride: young children, pregnant women, and anyone with vision, balance or other problems that would prevent them from riding a bicycle. eBikes are single-rider vehicles — only one person at a time.

Intended terrain: eBikes are for on-road or improved-trail use only and should not be used for riding rough trails. Damage may occur if used off road.

Alcohol and drugs: do not operate the electric bike after consuming any amount of alcohol or taking any drugs.

Helmets: the manual specifies that the correct helmet should be comfortable to the rider, lightweight, well ventilated, fit snugly, and cover the forehead. Learn and observe all road rules for the area where you ride, including always wearing an approved helmet.

Chain tension: approximately 15 mm of slack. To adjust, loosen the rear axle nuts, adjust the chain tightness screw until slack is correct, then tighten the rear axle screw.

Wet-weather braking: in rain or snow, braking distance increases. At 20 km/h the wet braking distance should not exceed 15 m. Adjust the brakes frequently and replace brake pads in time.

Electrical elements: the electric components can only be cleaned on the outside. There is no need to maintain the inside — and opening them voids the warranty on those parts.

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