Euy S4 Pro Dual Motor Moped-Style Electric Bike

41st of 292 we've scored in Electric Bikes

41st of 292 in E-Bikes

Euy S4 Pro Dual Motor Moped-Style Electric Bike

Class 3
1,001-1,500 Wh
61-80 mi claimed
351-400 lb max load

SVT Score, Upper

Usability6.1/10Social6.5/10The SVT Score is placed on its category's range

Versus

SVT SCORESRead review

A dual-motor moped-style e-bike with a 1,300 Wh battery and 4-piston hydraulic brakes, heavy and sold with an unlock past 28 mph.

$1,199

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SKU: EUYS4PRO Category: Electric Bikes Brand: Euy

Usability

6.1 out of 10

Battery91,300 Wh (52 V, 25 Ah) on the moped-style ladder

Option: S4 Pro Max with 1,560 Wh battery $1,499.00
Option: spare S4 Pro battery $480.00

Motor10192 Nm, two hub motors at 96 Nm each (summed)

Peak: 1,500 W front and 2,000 W rear claimed, not scored

Ride Hardware74-piston hydraulic discs, 203 mm rotors, dual crown fork, rear spring shock

Weight490 lb with the battery, the Pro Max figure

Without battery: 76.4 lb, Pro Max figure

Features7removable battery, lights, turn signals, colour display, throttle

IP: IP65 stated for the battery only, not counted

Verification2UL 2849 badge; QGNS.E546850 lists S4, not the S4 Pro trim sold on this listing

Searched: UL Certipedia Intertek SGS TÜV SÜD CPSC Health Canada
Record: UL Product iQ, UL 2849 (QGNS, Electrical Systems for E-Bikes), S4 (family code; S4 Pro / S4 Pro Max not listed), Foshan Zhengbu Technology Co.,Ltd

Better on verificationEngwe M20 3.0TÜV Rheinland's Certipedia lists certificate CU 72605445. $1,399Scores 6.0

Warranty & Support1motor and controller one week after delivery; battery 1 year, prorated

Policy: the same page gives the bike a one-year all-inclusive term and the battery 1 year or 300 cycles

Better on warranty & supportEngwe M20 3.0The battery. $1,399Scores 3.0

Strengths

Two motors give strong climbing power
Long moped seat is comfortable
Big removable battery for long rides
Turn signals built in
Four-piston hydraulic brakes stop hard

Drawbacks

Heavy to lift
Cadence sensor rather than a torque sensor
Unlockable speed beyond class limits
Weight published only for the Pro Max
Motor and controller warranty runs one week

Verdict

A strong, comfortable moped-style ride, but heavy and easily unlocked past legal speed

Social score

6.5 out of 10

RedditProduct-line6 out of 10

r/ebikes: an owner of the single-motor S4 rode 12 miles through Providence mostly on throttle and had 51% battery left; called it amazing (Oct 2023)

GoogleProduct-line7 out of 10

Mountain Weekly News (Mike Hardaker; affiliate links, unit source not stated) tested the S4 Pro Max: liked the dual motors, torque sensor and seat, clocked over 30 mph, found the 7-speed drivetrain underwhelming (Nov 2024)

YouTubeNot scored

The YouTube pool is blank: the reviews found (Randy Rides, Monkey Wrench Mike, E-Bike Studio, Brandon Wagstaff, Quincy Sandbank) are featured as rider reviews on the brand's own product pages, a brand placement (October 2026).

AmazonNot scored

The Amazon pool is blank: the EUYBIKE-branded listings found are sold by a third-party seller or show their seller only after sign-in (October 2026).

User reviewsNot scored

No major US retailer sells Euy e-bikes as the seller (October 2026).

Trustpilot

On Trustpilot, euybike.com holds a TrustScore of 4.1 from 183 reviews, with 70% five-star and 9% one-star over the last 12 months (October 2026).
The Trustpilot page is claimed and invites customers to review.

Track record

BBB lists Euybike in City of Industry, California, as not accredited, rated F, with 7 complaints closed in three years (October 2026).
The search of CPSC and Health Canada recalls turned up none naming Euybike e-bikes or batteries (October 2026).

Not countedExcluded

Not counted in any pool: the reviews and videos on the brand's own store, its Facebook, Instagram and YouTube channels, and creator videos the store features as rider reviews.
The retailer pool is blank: none of Walmart, Best Buy, Target, Costco, REI, Home Depot and Lowe's lists it (October 2026).

Specs

TypeMoped-Style
E-Bike ClassClass 3
Battery1,001-1,500 Wh
MotorDual hub
Top Speed21-28 mph
Claimed Range61-80 mi
WeightOver 85 lb
Max Rider Load351-400 lb
BrakesHydraulic disc
SuspensionFull
FoldingDoes not fold
CertificationsClaimed only
Warranty1 Year

Show 7 moreShow fewer

Not checked: The S4 Pro's own weight and range, published only for the Pro Max

At a glance

Shimano 7-speed gearing
USB port on the display
Kenda fat tires

Company

The EUY US trademark and the EUYBIKE application are recorded to an individual owner in Shenzhen, China.
The brand's e-bikes are also listed on Amazon under the EUYBIKE name.

Where it sells

Euy e-bikes are sold in the US through the brand's own store at euybike.com, which ships free to the lower 48 from warehouses in Walnut and Rialto, California.
The store's terms name the operator only as "euy", and its privacy policy is an unfilled template, so the store names no legal entity.
Its store sells fat tire, folding, moped-style and utility e-bikes on 20-inch wheels.

Description

The Euy S4 Pro is the entry configuration of the S4 Pro Max listing: a moped-style fat tire e-bike with front and rear hub motors rated 1,000 W and 1,500 W (1,500 W and 2,000 W peak) and 2 x 96 Nm, and a removable 52 V, 25 Ah battery of 1,300 Wh (52 V x 25 Ah).

It has hydraulic disc brakes with 4-piston calipers and 203 mm rotors, a dual crown fork with lockout, a rear spring shock, a cadence sensor and 20 x 4.0 in Kenda tires. The listing gives 90 lb with the battery and 76.4 lb without for the Pro Max only, and a 400 lb maximum load for both.

The badge reads 28 mph with an unlock to 40 mph, and the maker claims up to 80 miles with pedal assist for the line. It has a long bench seat, a half-twist throttle, a full colour LCD with USB charging, an LED headlight, turn signals and a Shimano 7-speed drivetrain.

The S4 Pro Max on the same listing sells for $1,499.00 with a 52 V, 30 Ah 1,560 Wh battery, a torque sensor and an air shock. A spare S4 Pro battery is listed at $480.00 and a seat extension for a passenger at $29.00.