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 Elektrische Fiets easy to assemble?

The Koolux BK6S 4.0 Elektrische Fiets 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 Elektrische Fiets water resistant?

The Koolux BK6S 4.0 Elektrische Fiets 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 Elektrische Fiets

Motor

500W

Battery

48V 15AH

Speed

24 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

Product variants:

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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 Elektrische Fiets 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 Elektrische Fiets 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 Elektrische Fiets? 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: 150 kg

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

Snelle samenvatting
De KOOLUX BK6S 4.0 combineert robuuste tractie met een dikke band met een krachtige 500 W motor en een 48 V 15 Ah accu met hoge capaciteit. Ontworpen voor zowel stedelijke wegen als offroad paden, biedt hij stabiele handling en betrouwbare prestaties.

Soepele vermogensafgifte
De 500 W naafmotor biedt responsieve acceleratie en soepele trapondersteuning in zeven niveaus, zodat je moeiteloos heuvels en tegenwind bedwingt. Een duimgashendel zorgt voor direct vermogen wanneer je een boost nodig hebt.

Comfort & Controle
Brede 4,0" banden en voorvering absorberen hobbels en zorgen voor grip op losse of oneffen oppervlakken. Dubbele mechanische schijfremmen zorgen voor consistente, gecontroleerde remkracht in alle weersomstandigheden.

Slim batterijsysteem
Een afsluitbare, verwijderbare 48V 15Ah accu biedt een lange actieradius en is gemakkelijk op te laden buiten de fiets. Ingebouwde beveiligingscircuits beschermen tegen overladen, overontladen en oververhitting voor veilig en betrouwbaar gebruik.

Technologie waarop u kunt vertrouwen
Het heldere lcd-scherm met achtergrondverlichting geeft in één oogopslag de snelheid, het batterijniveau, de afgelegde afstand en de ondersteuningsmodus weer. Met de eenvoudige bediening op het stuur kun je de ondersteuningsniveaus eenvoudig wijzigen en je ritgegevens bekijken.

Gebouwd voor dagelijks gebruik
Dankzij het duurzame frame, de stabiliteit van dikke banden en het eenvoudig opvouwbare bagagedragerontwerp is de BK6S 4.0 klaar voor dagelijks woon-werkverkeer, weekendavonturen en alles daartussenin, waar u ook naartoe wilt rijden.

Specifications

Collection	Koolux elektrische fietsen
Brand	Koolux
Bike Type	Stad & Forens, Vouwen, Dikke band
Motor Power	500W
Battery	48V 15AH
Top Speed	15,5 MPH
Max Range	41 mijl
Charging Time	5+ uur

Shock Absorbers	Voorkant
Brakes	Dubbele mechanische schijfremmen
Bike Weight	27 kg
Max Climb	15 graden
Max Rider Weight	150 kg
Dimensions
Built Dimensions	182 × 60 × 110 cm (L × W × H)
Box Dimensions	93 × 55 × 76 cm (L × W × H)