Can the Koolux BK6S 4.0 battery be removed for indoor charging?

Yes. The lockable battery can be charged on the bike or removed and taken indoors. Support it securely as it slides out, use the supplied charger on a dry, stable surface and make sure it clicks and locks fully back into position before riding.

How does the Koolux BK6S 4.0 differ from the BK6S Pro?

The standard BK6S 4.0 uses one battery and is the simpler choice for typical rides. The BK6S Pro carries two batteries with 23.4Ah combined capacity, giving it a longer-distance focus but adding cost and weight.

Will the Koolux BK6S 4.0 fit a shorter or taller rider?

Published guidance places it around 165–195 cm, but height alone does not guarantee comfort. Its 20 × 4-inch tyres and folding frame still create a fairly tall, broad bike. Check that you can stand over the frame, reach both brake levers and achieve a safe knee bend at the lowest suitable saddle position.

Is the Koolux BK6S 4.0 Elektrofahrrad easy to assemble?

The Koolux BK6S 4.0 Elektrofahrrad arrives mostly assembled. Final setup normally includes aligning and securing the handlebars, fitting the pedals and completing essential safety checks. Allow approximately 20–30 minutes, or select our professional assembly and PDI service.

Is the Koolux BK6S 4.0 Elektrofahrrad water resistant?

The Koolux BK6S 4.0 Elektrofahrrad is not fully waterproof. Avoid prolonged exposure to heavy rain, and never submerge or pressure wash the bike or its electrical components. After riding in wet conditions, wipe the bike dry and store it in a dry, sheltered location.

Koolux BK6S 4.0 Electric Bike 500W 48V 15Ah

Koolux BK6S 4.0 Elektrofahrrad

Motor

500W

Battery

48V 15AH

Speed

25 KM/H

Range

66 KM

€1.066,95 €782,95

Sold out

Klarna €260,98 ×3

Clearpay €195,74 ×4

PayPal €260,98 ×3

Finance

From —/mo 24, 36 or 48 months at 15.9% APR 6 or 12 months at 0% interest

Shop Pay

From €65,25/mo 12 months at 0% interest Up to 24 months available

Produktvarianten:

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Out of stock

This item is currently unavailable
Contact us for the latest restock estimate
We can recommend a suitable in-stock alternative

Click & Collect Collection from our Nuneaton workshop

Collect from our Nuneaton workshop

Collection is available by appointment from our Nuneaton workshop. The preparation time depends on where the product is currently stored. Contact us before ordering for the latest availability, or place your order and we will confirm when it is ready to collect.

Transfer required to Nuneaton Usually 5–7 working days

Products stored at another warehouse normally require 5–7 working days to reach our workshop. We will confirm as soon as the item is ready and arrange your collection appointment.

Best Price Guaranteed Found the same product for less?

Best Price Guaranteed

Seen the exact same product advertised for less? Send us the live offer before you order and we’ll check whether we can match it.

We consider genuine UK retailer offers for items that are in stock
The model, specification, colour, condition and delivery terms must be like-for-like
Marketplace or private sellers, used or clearance items, private codes, finance-only offers, bundle deals and obvious errors are excluded

Usually answered within 24 hours. Need a quicker answer? WhatsApp us or call 0800 099 6187.

Why Buy From TrailSurge? UK showroom, product support & aftercare

Buy your Koolux BK6S 4.0 Elektrofahrrad with UK-based support

TrailSurge is a UK retailer with a showroom and workshop in Nuneaton. Our team can help before you order and continue supporting you after your Koolux BK6S 4.0 Elektrofahrrad arrives.

UK-based customer support before and after your purchase
Showroom and workshop in Nuneaton
Help with product questions, setup, parts and aftercare
Tracked UK delivery with support if you need help with your order
Speak to a real member of our team before placing your order

Why buy through TrailSurge? For the best UK-based support and aftercare, we recommend buying through TrailSurge rather than ordering directly from overseas manufacturers or China-based sellers, where returns, warranty support and parts handling can be more difficult.

Need help with the Koolux BK6S 4.0 Elektrofahrrad? Ask our team a question before ordering.

WhatsApp Us Call Us 0800 099 6187

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 .

Check your fit

Size & Rider Fit

Maximum Rider Weight: 150KG

Trail Surge Warranty Plus FULL OFFICIAL WARRANTY INCLUDED UK-based support alongside the manufacturer warranty TRAILSURGE COVER 12 months

TWO LAYERS OF PROTECTION

More confidence after you buy

TrailSurge Warranty+ gives you a direct UK warranty alongside the product’s manufacturer warranty.

01 TRAILSURGE WARRANTY +

12 months of TrailSurge support

UK-based fault support
Battery, motor and frame fully covered.
Repair, parts or another suitable solution where eligible

02 Koolux WARRANTY

Manufacturer warranty period 12 months against manufacturing defects.

Manufacturer cover

Confirmed production faults affecting the original frame and factory-installed electrical or mechanical components.

Typical component protection Eligible faults affecting the frame and forks, motor and drive system, controller, battery and BMS, charger, wiring, display, gears, brakes and factory-fitted controls.

Description

Kurzer Überblick
Das KOOLUX BK6S 4.0 kombiniert eine robuste Traktion auf fetten Reifen mit einem leistungsstarken 500-W-Motor und einer hochkapazitiven 48-V-15-Ah-Batterie. Er wurde sowohl für den Einsatz auf städtischen Straßen als auch im Gelände entwickelt und bietet ein stabiles Fahrverhalten und eine verlässliche Leistung.

Sanfte Leistungsentfaltung
Der 500-W-Nabenmotor bietet eine reaktionsschnelle Beschleunigung und eine sanfte Tretunterstützung in sieben Stufen, so dass Sie Hügel und Gegenwind ohne Anstrengung bewältigen können. Ein Daumengashebel liefert sofortige Leistung, wenn Sie einen Schub brauchen.

Komfort und Kontrolle
Die breiten 4.0″-Reifen und die vordere Federung absorbieren Stöße und sorgen für Grip auf losem oder unebenem Untergrund. Zwei mechanische Scheibenbremsen sorgen für gleichmäßige, kontrollierte Bremskraft bei jedem Wetter.

Intelligentes Batteriesystem
Eine abschließbare, herausnehmbare 48-V-15-Ah-Batterie sorgt für große Reichweite und bequemes Aufladen außerhalb des Fahrrads. Eingebaute Schutzschaltungen schützen vor Überladung, Überentladung und Überhitzung für einen sicheren und zuverlässigen Betrieb.

Technik, der Sie vertrauen können
Das übersichtliche LCD-Display mit Hintergrundbeleuchtung zeigt Geschwindigkeit, Akkustand, zurückgelegte Strecke und Unterstützungsmodus auf einen Blick an. Mit den einfachen Bedienelementen am Lenker können Sie mühelos die Unterstützungsstufen wechseln und die Fahrdaten überwachen.

Für den alltäglichen Gebrauch gebaut
Mit seinem robusten Rahmen, der Stabilität der Reifen und der einfachen, klappbaren Gepäckträgermontage ist das BK6S 4.0 bereit für tägliche Fahrten, Wochenendausflüge und alles, was dazwischen liegt - wo auch immer Sie fahren möchten.

Specifications

Collection	Koolux Elektrofahrräder
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
Dimensions
Built Dimensions	182 × 60 × 110 cm (L × W × H)
Box Dimensions	93 × 55 × 76 cm (L × W × H)