Folding fat-tyre e-bike
KOOLUX BK6S 4.0
The 750 W folding fat bike, compact in the city and planted off-road.
€849
4.8· 42 reviews
90km
Range
750W
Power
624Wh
Battery
Every angle
Turn around the machine.
01 / 05
750 W
Motor
48 V 13 Ah
Battery
45-90 km
Range
20 × 4.0
Tyres
Front/rear disc
Brakes
IP54
Protection
Technology
Every detail, engineered to ride.
Battery
624 Wh
A 624 Wh lithium-ion pack with a smart BMS — up to 90 km, fully charged in 7 h.
Use cases
Built to go everywhere.
Folding design
A compact frame that makes the bike easier to store at home, at work or in a vehicle.
20 × 4.0 fat tyres
More grip, more comfort and confident road presence on wet streets, gravel or cobbles.
Long range
The 48 V 13 Ah battery covers daily commutes and longer rides with 45 to 90 km of range.
Urban & off-road
A versatile setup for bike lanes, neighborhood roads and rougher light-trail surfaces.
By the numbers
0
km
Max range
0
W
Motor power
0
Wh
Battery energy
0
km/h
Assisted speed
Technical sheet
Precision engineering, on display
Every figure is measured, verified and certified to the European EN 15194 standard.
Range
Eco mode · mixed urban profile
0
Assisted speed
EU legal limit · 25 km/h
0
Battery
Lithium-ion · smart BMS
0
Motor power
Rated output · brushless motor
0.0
Charge time
0 to 100% · fast charger included
Compliant with EU directive 168/2013 — EPAC category.
Design
The stance of a motorbike, the silence of electric.
The 750 W folding fat bike, compact in the city and planted off-road.
Range
90 km on a single charge.
A battery architecture built for distance. Leave in the morning, return at night — never hunting for a socket.
Power
750 W that flatten every hill.
Immediate, linear torque, electronically metered for a clean, always-controlled surge.
Buy with confidence
Built to last, fully backed.
10 yrs
Frame warranty
10-year frame, 2-year battery and motor. Genuine parts, everywhere in Europe.
4.8
Verified reviews
42 verified reviews for this model, collected after delivery.
5–9 d
Europe delivery
Insured, tracked shipping delivered 90% pre-assembled. 14-day returns.
7/7
Expert support
A dedicated e-mobility team, reachable 7 days a week, plus a partner workshop network.
Technical details
Every useful measurement.
| Brand | KOOLUX |
|---|---|
| Model | BK6S 4.0 |
| Category | Folding fat-tyre e-bike |
| Motor | 750 W |
| Battery | 48 V 13 Ah lithium-ion |
| Range | 45 to 90 km |
| Max assisted speed | 25 km/h (EU) |
| Tyres | 20 × 4.0 fat tyres |
| Brakes | Front and rear disc brakes |
| Charging time | 6.5 to 7 h |
| Protection | IP54 |
| Max load | 120 kg |
FAQ
Questions before you ride.
Is the BK6S 4.0 compliant for riding in Europe?
Yes. Pedal assist is limited to 25 km/h for use in line with European e-bike rules.
What range should I expect?
The rated range is 45 to 90 km depending on assist mode, terrain, carried load, tyre pressure and temperature.
Can it ride in the rain?
IP54 protection resists splashes and light rain. Avoid immersion, high-pressure washing and long storage under heavy rain.
Who is this model for?
It suits riders who want a powerful folding fat bike for daily rides, rougher roads and weekend use without moving to a cargo format.
Folding fat-tyre e-bike
KOOLUX BK6S 4.0
From
€849
VAT included
In stock
- 10-year frame warranty
- Europe delivery in 5–9 days
- 14-day returns
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