Euybike S4 Pro
A dual-motor moped-style fat-tire e-bike with a 52V 25Ah battery, four-piston 203 mm brakes and an RGB tail light. Ben’s read: torquey, nimble and great brakes, with grips he would swap.
Watch the Review
Full Video Review
Watch on YouTube →
Ben compares the S4 Pro with the S4 Pro Max in the review: the Max adds a 30Ah battery, a torque sensor and an air shock.
From the Review
Out on the Road
Frames from Ben's video
Up Close
Detail Gallery
Shot in Ben's studio
Make It Yours
The Colour
Check availability →
The Engineering
What Makes The Euybike S4 Pro Tick
Motors & Battery
Two hubs, 52V 25Ah, 2A charger
Two switchable motors
Hold the bottom button to pick front, rear or both. The screen shows which are on.
Feathered throttle
“I can just easily feather that throttle, get a little bit of power, stay in complete control.”
Slow cadence sensor
About two full crank revolutions before the motors give power, then about a second of overrun.
Frame & Suspension
Short wheelbase, coil shock, 2-inch fork
Coil shock
Preload only. Ben scores the suspension about 7 out of 10: enough travel to delete bumps.
Nimble and sporty
A short wheelbase that suits curbs and gates in the city.
Wide, soft saddle
“One of the most comfortable seats I’ve ever been on.”
Brakes & Tires
Four-piston 203 mm hydraulics, 20 x 4 fat tires
Four-piston, 203 mm
From 28 mph Ben stopped with a bike length to spare.
CST-style fat tires
Fine on road and the beach; not the deepest tread.
Lights
A wide, bright headlight with daytime halo, turn signals and an RGB tail light.
Find Your Fit
Size & Fittings
Ben, 5'9", beside the S4 Pro from the review
Will It Fit You?
- Weight90 lb with battery (Euybike)
- Max load400 lb
- Rider height5'3" to 6'3" (Euybike)
- Seat height32 in
- Standover27.5 in
- Wheels20 x 4.0 in
Ben, at 5'9", can touch the ground easily. He says 6'2" or 6'3" is the maximum height and that riders around 5'5" or shorter will struggle to reach the ground with both feet.
Plan Your Ride
Your Range, Not Mine
Brand range figures come from a light rider on flat ground in perfect weather. Set it up the way you actually ride and you get the window to plan a trip inside.
The Numbers
Full Specifications
Source: euybike.com→⚡ E-System
🚦 Performance
🔧 Chassis & Brakes
✨ Weight & Box
The Bike Cave Verdict
Ben’s Take
If you want a really torquy and powerful dual motor moped-style e-bike for under 1,500 bucks, this is definitely a great option.
The brakes on this bike are some of the best you can get out there.
If you’re pushing 250 to 300 lb, the Max might be the one for you.
Ben did not give this bike a Cave Score in the review, so there is no number here.
What I liked
- Dual motors: 24 mph up a 15% hill
- Four-piston 203 mm brakes with room to spare
- Throttle you can feather
- Comfortable wide saddle
- Short, nimble wheelbase
- RGB tail light with turn signals
What to know
- Grips do not lock on and Ben says they suck
- Cadence sensor needs about two crank revolutions
- Not comfortable to pedal
- Suspension has little travel
- No battery percentage or voltage on the screen
- Too short for riders much over 6'2"
Frequently asked questions
How fast is the Euybike S4 Pro?
Euybike claims 28 mph. Ben saw 31 mph on his GPS with both motors on.
How far does the S4 Pro go?
Euybike claims 80 miles. Ben was 16 miles in at half battery and says over 30 miles at full power, and about double with lower assist.
What is the difference between the S4 Pro and S4 Pro Max?
Euybike lists the Max with a 30Ah battery, a torque sensor and an air shock. The S4 Pro has 25Ah, a cadence sensor and a coil shock. Ben says heavier riders should look at the Max.
How much does the S4 Pro cost?
From $1,199 on Euybike’s US store for the S4 Pro, and $1,499 for the S4 Pro Max (checked October 13, 2026).
Is there a discount code for Euybike?
No code is listed. Our Euybike link gets you the store’s current price.