KOOLUX BK6S 4.0 Folding E-Bike UK – 48V 13Ah 25km/h 20" Fat Tyre
KOOLUX BK6S 4.0 Folding E-Bike UK – 48V 13Ah 25km/h 20" Fat Tyre
KOOLUX BK6S 4.0 – High-End Folding E-Bike. Powerful Battery. Compact Storage.
Meet the BK6S 4.0 – the folding electric bike that combines high-end features with practical everyday usability.
With a 48V 13Ah battery, 20" fat tyres for all-terrain confidence, a UK-legal 250W motor, and a foldable frame, the BK6S 4.0 is built for commuters, adventurers, and anyone who wants the flexibility of a folding e-bike without sacrificing power or range.
High-end performance. Folding convenience. One bike.
Who Is This Bike For?
The KOOLUX BK6S 4.0 is perfect for:
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Daily commuters – fold it, store it, ride it. Repeat.
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Apartment dwellers – no garage? No problem. Folds to fit in small spaces.
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Caravan and motorhome owners – take your e-bike on every holiday.
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Multi-modal travellers – bike + train + bus + car = total flexibility.
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Riders wanting fat tyre stability – 20" fat tyres grip everything.
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Value-conscious buyers – high-end features at an accessible price.
48V 13Ah Battery – Serious Range, Single Battery Simplicity
The BK6S 4.0 features a 48V 13Ah lithium-ion battery – the sweet spot between range and weight.
Real-world range you can trust:
| Riding Mode | Expected Range |
|---|---|
| Low assist (Eco mode) | 60-70km (37-43 miles) |
| Mixed riding (Normal) | 45-55km (28-34 miles) |
| High assist / Hills / Fat tyres | 35-45km (22-28 miles) |
Dual charging options:
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Rear battery: 7-8 hours
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Hidden battery: 5-6 hours
Removable, rechargeable anywhere. No complicated dual-battery management. Just one battery, one charger, simple riding.
UK Legal 250W Motor – Reliable Power
The BK6S 4.0 uses a rated 250W brushless hub motor – fully UK EAPC compliant:
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Smooth assistance up to 25km/h (15.5mph)
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Climbs 25° hills – handles steep inclines with ease
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Quiet, reliable, maintenance-free
No license, no tax, no registration. Just fold, ride, and enjoy.
20" Fat Tyres – Stability on Any Surface
The 20" fat tyres are the BK6S 4.0's all-terrain advantage:
| Surface | Performance |
|---|---|
| Paved roads | Smooth, stable, comfortable |
| Gravel and canal paths | Excellent grip, absorbs vibration |
| Mud and grass | Fat tyres float over soft ground |
| Potholes and rough tarmac | Cushioned ride, less fatigue |
More stable than thin tyres. More agile than 26" wheels. The perfect balance.
Mechanical Brakes – Reliable Stopping Power
The BK6S 4.0 comes with mechanical disc brakes (front and rear).
Why mechanical brakes work well:
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Consistent stopping in dry and wet conditions
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Easy to adjust – simple cable tensioning
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Low maintenance cost – pads are cheap and widely available
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Reliable and proven technology
For most riders, mechanical brakes offer all the stopping power you need at a lower price point than hydraulic.
Folding Frame – Storage Solved
The BK6S 4.0 features a folding frame that collapses quickly and easily.
Why folding matters:
| Scenario | Without Folding | With BK6S 4.0 |
|---|---|---|
| Small flat | Bike takes up hallway | Folds into cupboard |
| Train commute | Not allowed or extra fee | Fold and carry on |
| Car boot | Requires rack or large boot | Fits in most boots |
| Caravan trip | Hard to bring | Folds into storage |
| Office storage | Left outside (risk of theft) | Folds under desk |
Store indoors. Sleep better.
Built for UK Weather – IP54 Waterproof Rating
The BK6S 4.0 carries an IP54 waterproof rating:
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Rain-resistant electronics
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Protected against dust ingress
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Splash-proof from all directions
Ride confidently in typical UK weather.
Strong Load Capacity – 120kg / 264lbs
The BK6S 4.0 supports up to 120kg (264lbs) – suitable for:
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Heavier riders
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Carrying cargo or shopping
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Delivery work with loaded bags
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Riding with a child trailer (check compatibility)
Built strong. Carries heavy.
Technical Specifications (Full List)
| Specification | Detail |
|---|---|
| Model | KOOLUX BK6S 4.0 |
| Type | High-end version Folding E-Bike |
| Battery Type | Lithium-ion |
| Battery Capacity | 48V 13Ah |
| Charging Time | Rear: 7-8h; Hidden: 5-6h |
| Brake System | Mechanical disc brakes |
| Motor Power | Rated 250W (UK legal) |
| Top Speed | 25km/h (15.5mph) |
| Climbing Ability | 25° |
| Tire Size | 20 inch fat tyre |
| Waterproof Rating | IP54 |
| Max Load | 120kg (264lbs) |
| Net Weight | 38.6kg (85lbs) |
| Gross Weight | 45.6kg (100.5lbs) |
| Package Size | 151 × 30 × 84 cm |
| Unfolding Size | 180 × 60 × 125 cm |
What's in the Box?
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KOOLUX BK6S 4.0 Folding E-Bike
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48V 13Ah Lithium-ion Battery (removable)
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Charger
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Tool Kit
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Pedals
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User Manual
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LCD Display (pre-installed)
Why Choose the KOOLUX BK6S 4.0 Over Other Folding E-Bikes?
| Feature | KOOLUX BK6S 4.0 | Standard Folding Ebike | Premium Folding Ebike |
|---|---|---|---|
| Battery | 48V 13Ah (624Wh) | 36V 10Ah (360Wh) | 48V 14-20Ah |
| Range | 35-70km | 30-50km | 60-120km |
| Tyres | 20" fat tyres | 20×1.95" thin | 20×4.0" fat |
| Brakes | Mechanical disc | V-brake or cheap disc | Hydraulic disc |
| Waterproof | IP54 | Often none | IP54/IP65 |
| Max load | 120kg | 100kg typical | 120kg |
| Weight | 38.6kg | 25-30kg | 30-40kg |
| Folding | ✅ Yes | ✅ Yes | ✅ Yes |
| Best for | Value + fat tyres + folding | Basic commuting | Premium features |
The value proposition: Fat tyre stability + 48V power + folding convenience at a competitive price.