Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah
Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah

Koolux BK6S 4.0 Electric Bike

£899.00 £649.00
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In Stock – -- Sold in 24 Hours
Free 3–5 Day Express UK Delivery
Colour:Black
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Product Specifications

Brand Koolux
Bike Type City & Commuter, Folding, Fat Tyre
Motor Power 500W
Maximum Speed 15.5 MPH
Maximum Range 41 Miles
Charging Time 5+ Hours
Shock Absorbers Front
Brakes Dual Mechanical Disc Brakes
Bike Weight 27KG
Max Climb 15 degrees
Maximum Load 150KG
Description
Reviews

Quick Summary
The KOOLUX BK6S 4.0 combines rugged fat‑tyre traction with a powerful 500 W motor and a high‑capacity 48 V 15 Ah battery. Designed for both urban streets and off‑road paths, it delivers stable handling and dependable performance.

Smooth Power Delivery
The 500 W 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.

 
A labeled diagram of an electric bicycle highlights its parts, including the dashboard, handle bar, saddle, battery pack, motor, disc brake, pedals, front light, fender, and quick release locks.
Close-up of an e-bike’s handlebar and display, highlighting buttons and controls for battery status, real-time speed, and driving distance. The image also shows the Shimano seven-speed gear and three riding modes: pure electric, moped, and normal.
Close-up of a black electric bikes front wheel with thick, wear-resistant fat tires. Text highlights the tires strength and ability to handle various road surfaces. The brand name KOOLUX is visible on the bike frame.
A red electric bike showing its three driving modes: classic, pedal assist, and pure electric. The bike features a removable battery, adjustable seat and handlebar, reflector, lightweight frame, and folding capability.

What's in the box?

Koolux BK6S 4.0 Electric Bike

1X Main Product (Mostly Built)

1X Charger

1X Charger

1X Toolkit

1X Toolkit

1X Instructions & User Guide

1X Instructions & User Guide

Customer Reviews

Based on 16 reviews
81%
(13)
19%
(3)
0%
(0)
0%
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0%
(0)
I
Imogen L.
Good value

Feels solid and well put together for the price.

Great to hear — shout if you need anything.

C
Colene Orn

Very good bike. Uk legal. Climbs hills with ease. Very fast delivery and brilliant customer support. Would 100% recommend.

User picture
A
Aisha R.
Battery life is good

Motor is quiet and the assist comes in smoothly.

Appreciate the feedback, enjoy the rides.

J
Jamila Larson

Very happy with the bike. Had an issue with it cutting out. They asked for a video and sent a new battery straight out. Arrived at my door two days later. Had no issues since great bike and customer service 👍

M
Malcom Towne

Very happy with bike , 3 day uk delivery , tracking worked fine, bike needs front wheel attaching, tyres pumping up, front caliper needed adjusting , nothing unexpected, bike comes with tool kit, pump, comprehensive manual, bike exactly as listing. Goes very well ! Lots of power , arrives set at 15.5 mph , throttle not fitted (but included) for use on private land of course. Seller highly recommend, had couple of questions that were answered straight away, great bike at great price ! 👍 😃 , very well packaged

User picture User picture User picture User picture User picture
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4.7

3+ online ratings
The summary star rating & review is based on aggregated reviews of this product across the web. It cannot be altered by the merchant and can be verified by emailing support@onereview.app.

Other Web Reviews:

4.7

3+ online ratings
The summary star rating & review is based on aggregated reviews of this product across the web. It cannot be altered by the merchant and can be verified by emailing support@onereview.app.

What people like

This electric bike is highly regarded as a cost-effective, adaptable, and capable folding fat-tire option, appealing to urban commuters, recreational riders, and newcomers to e-biking. It is praised for striking a good balance between motor power, battery range, rider comfort, and its ability to handle various terrains effectively.

Pros

  • Budget-Friendly Value: It offers a comprehensive set of features and specifications typically found in more expensive models, making it an excellent value for its price.
  • Powerful Motor: Equipped with a responsive 500W (or 250W with higher peak) motor, it provides ample power for tackling hills, headwinds, and comfortable cruising.
  • All-Terrain Capability: Its robust 20x4.0-inch fat tires deliver superior grip and stability, allowing for comfortable and stable rides across diverse surfaces including city roads, gravel, sand, and snow.
  • Folding Design: The foldable frame enhances portability and ease of storage, making it convenient for transport in vehicles, apartments, or public transit.
  • Long Battery Range: A 48V 15Ah (or 13Ah) battery provides an impressive range of 45-90 km (up to 95 km) on a single charge, suitable for longer commutes and adventures.
  • Comfortable Riding: Features like front suspension (and sometimes a suspension seat post) combined with fat tires contribute to a smooth and comfortable experience, even on uneven terrain.
  • Reliable Braking: The dual disc brake system offers strong and consistent stopping power, ensuring safety in various weather conditions.
  • Versatile Riding Modes: Riders can choose from pedal assist, pure electric (throttle), and classic pedal modes, offering flexibility in how they ride.
  • Durable Construction: The bike is built with a sturdy aluminum alloy frame, indicating good durability.
  • Integrated Accessories: It often comes equipped with practical features such as integrated lights, mudguards, and a rear carrier.

Cons

  • Considerable Weight: At approximately 33 kg, the bike is relatively heavy, which can make it challenging to lift or carry, particularly for storage or loading.
  • Lack of Rear Suspension: While featuring front suspension, the absence of rear suspension is noted by some reviewers, potentially impacting comfort on very rough trails.
  • Handlebar Width: Some feedback suggests the handlebars are not very wide, which might affect single-handed control, especially during braking or accelerating.
  • Braking Effort: Mechanical disc brakes may require a firm pull to achieve effective stopping, which some users noted.
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Frequently Asked Questions

Find answers to common questions about our products and services.
We offer a 30-day return policy for all unused items in their original packaging. Simply contact our customer service team to initiate a return.
Free Delivery on all orders. Your product will be delivered within 3-5 days. via Express Delivery. We use a panel of trusted couriers such as DPD, UPS, Fedex, DHL. Tracking information is provided upon dispatch.
Once your order ships, you'll receive a tracking number via email. You can use this number to track your package on our website or the carrier's site.
We are confident in the quality of E-Bikes and E-Scooters we offer here at Trail Surge. All Products come with a minimum 12 Month Manufacture Guarantee/Warranty for main components.
Yes 90% Assembled. All products come with a toolkit and an instruction manual. If you need any extra help with setting up your bike you can contact our customer support team.
How often and how far do you plan to ride? For daily commutes, consider a commuter-focused ebike with a comfortable riding position and good range. If you plan to use it for weekend adventures or longer rides, look for a model with a longer range and more powerful motor such as a Mountain E-Bike.

Authorised Brands

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The word KOOLUX in all capital letters, with each letter in a different color: K in red, Os and U in green, L in yellow, and X in magenta, on a white background.
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The image shows the word Hidoes in bold, italicized yellow letters on a white background.
The image displays the word HITWAY in bold, black, uppercase letters on a white background.
The image shows the DYU logo, featuring a bold red graphic resembling a stylized D or checkmark above the black capital letters DYU on a white background.
Black text on a white background reads DUOTTS in a bold, modern font. The letter D has a unique solid and outline design, while the remaining letters are simple and rounded.
Black and white logo featuring a stylized circular emblem above the bold, uppercase text “VARUN” on a plain white background.
The image shows a red geometric S logo above the word SAMEBIKE written in bold, black, modern uppercase letters on a light gray background.
The word KOOLUX in all capital letters, with each letter in a different color: K in red, Os and U in green, L in yellow, and X in magenta, on a white background.
An orange, stylized bird or phoenix symbol appears above the word ENGWE written in a modern, futuristic black font on a white background.
Black geometric logo resembling a stylized bird above the words SUR-RON in modern, bold font, all set against a white background.
Black RCB logo on a white background, with three parallel vertical lines to the left of the bold letters RCB.
Black stylized text logo that reads IENYRID on a white background. The letters are bold and italicized, giving a sense of motion and modernity.
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