£24.64
£28.99
Brand:
Koolux BK6S 4.0 Electric Bike
Motor
500W
Battery
48V 15AH
Speed
15.5 MPH
Range
41 MILES
£899.00
£659.99
In stock
8 sold this week
Complete your ride
Save 15%
Add a helmet, lock or bike car rack before checkout.
£24.64
£28.99
Built & Delivered Ready To Ride
Optional
Built, safety checked and delivered ready to ride by our team.
£99.99
Free Premium Delivery
Get it between
calculating…
(
3-5 working days
)
Google Reviews
Rated 4.8 by customers
Trusted service, fast support and real UK customer feedback
Judge.me Reviews
Rated 4.9 by customers
Real product and service reviews from TrailSurge customers
Home Delivery Tracked options shown at checkout
Delivery options
Choose your delivery option at checkout. Availability may vary by product, stock location and postcode.
Trusted delivery partners
- Tracking details are sent once your order has been dispatched
- Some large, heavy or specialist items may arrive with a dedicated courier
- Remote areas, Highlands, islands and non-mainland postcodes may require extra time or a delivery surcharge
Returns
- 30-day returns on unused items
- Used items cannot be returned for change of mind
Click & Collect Collect from our Nuneaton workshop
Collect from our Nuneaton workshop
- We have a workshop in Nuneaton where selected orders can be collected
- If the item is not already at the workshop, we can usually transfer stock here for collection
- To choose collection, go to checkout and select Pickup in store
- We will confirm when your order is ready before you travel
Please wait for our confirmation before visiting, as some products need to be transferred to the workshop first.
Warranty & Price Promise Cover, exclusions and matching policy
Electric Bike Warranty
- Cover varies by brand and model. See our warranty page for full terms.
- Manufacturer cover usually applies to defects under normal use.
- Batteries, chargers, chains, brake pads, tyres and tubes may have limited cover.
- Wear, punctures, damage, water ingress and mods are usually excluded.
Price Promise
- We price match genuine UK retailer offers before you order
- We will not be beaten on price where the product, specification, stock status and delivery terms match
- Send us the live link and we will check the same brand, model, colour, condition and delivery terms
- UK retailers only. Marketplace sellers, used items, finance-only deals, code-only deals, clearance pricing and pricing errors may be excluded
Payment Options at Checkout Flexible payment options from trusted providers
PayPal
PAY IN 3
Pay in 3 with PayPal
3 monthly payments of £0.00
T&C's apply.
clearpay
Pay in 4 with Clearpay
4 interest free payments of £0.00
T&C's apply.
Klarna.
Pay in 3 with Klarna
3 monthly payments of £0.00
T&C's apply.
Pay Monthly
Payment Options at Checkout
From 3 to 12 months, product dependent
Options shown at checkout.
Pay monthly and split payment options are shown at checkout. Availability depends on order value, product, eligibility, provider checks and provider terms.
Road use notice: This bike is over 250W and is for private land/off-road use only. Need a UK road-compliant option?
View road legal e-bikes
.
Description
Quick Summary
The KOOLUX BK6S 4.0 combines rugged fat‑tyre traction with a powerful 750W motor and a high‑capacity 48 V 13 Ah battery. Designed for both urban streets and off‑road paths, it delivers stable handling and dependable performance.
Smooth Power Delivery
The 750W hub motor offers responsive acceleration and smooth pedal‑assist across seven levels, letting you tackle hills and headwinds without strain. A thumb throttle provides instant power when you need a boost.
Comfort & Control
Wide 4.0″ tyres and front suspension absorb bumps and maintain grip on loose or uneven surfaces. Dual mechanical disc brakes ensure consistent, controlled stopping power in all weather.
Smart Battery System
A lockable, removable 48 V 15 Ah battery provides long-range capability and convenient off‑bike charging. Built‑in protection circuits guard against over‑charge, over‑discharge, and overheating for safe, reliable use.
Tech You Can Trust
The clear backlit LCD displays speed, battery level, distance travelled, and assist mode at a glance. Simple handlebar controls let you switch assist levels and monitor ride data easily.
Built for Everyday Use
With its durable frame, fat‑tyre stability, and straightforward folding rack mount design, the BK6S 4.0 is ready for daily commutes, weekend adventures, and everything in between—wherever you choose to ride.
Specifications
| Collection | Electric Bikes |
|---|---|
| Brand | Koolux |
| Bike Type | City & Commuter, Folding, Fat Tyre |
| Motor Power | 500W |
| Battery | 48V 15AH |
| Top Speed | 15.5 MPH |
| Max Range | 41 Miles |
| Charging Time | 5+ Hours |
| Shock Absorbers | Front |
| Brakes | Dual Mechanical Disc Brakes |
| Bike Weight | 27KG |
| Max Climb | 15 degrees |
| Max Rider Weight | 150KG |
What inside the box?
1X Koolux BK6S 4.0 Electric Bike
1X Charger
2X Keys
1X Assembly Tools
1X Assembly User Manual
Koolux BK6S 4.0 FAQs
Koolux BK6S 4.0 Electric Bike
£659.99
