Do the Koolux BK10S colour choices change the bike's equipment?

Colour itself is cosmetic. Silver, Orange and Black are each listed with separate 500W and 750W motor choices, so check both selections before adding to basket. Choosing a colour does not automatically select the motor version.

Will the folded Koolux BK10S fit in a car boot?

Its published folded dimensions are about 92 × 50 × 80 cm, which fits many larger boots once measured carefully. At roughly 27.7–29.3 kg it remains a heavy one-person lift, so protect the controls, use good lifting technique and avoid assuming a small hatchback opening will accept it.

How much maintenance do the Koolux BK10S fat tyres need?

The 20 × 4-inch tyres are pneumatic, so they need pressure checks and can puncture. Inspect the sidewalls and tread, remove embedded debris and avoid riding underinflated; broad tyres can hide pressure loss until handling and battery use worsen.

Should I choose the Koolux BK10S or the longer-range X7?

Choose the BK10S for its smaller 48V 13Ah battery, lower weight and folding format when storage matters. Choose the X7 for its much larger 48V 25Ah battery and hydraulic brakes when longer rides and stronger braking are worth the extra bulk; the current X7 specification is around 43 kg.

Is the Koolux BK10S Fat Tyre Electric Bike easy to assemble?

The Koolux BK10S Fat Tyre Electric Bike 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 BK10S Fat Tyre Electric Bike water resistant?

The Koolux BK10S Fat Tyre Electric Bike 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.

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Koolux BK10S Fat Tyre Electric Bike 48V 13Ah Koolux

Brand:

Koolux BK10S Fat Tyre Electric Bike

Motor

250W,500W

Battery

48V 13AH

Speed

15.5 MPH

Range

40 MILES

£999.00 £709.99

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Klarna £236.66 ×3

Clearpay £177.50 ×4

PayPal £236.66 ×3

Finance

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

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From £59.17/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
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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.

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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 BK10S Fat Tyre Electric Bike 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 BK10S Fat Tyre Electric Bike 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 BK10S Fat Tyre Electric Bike? Ask our team a question before ordering.

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TrailSurge Warranty+ BEST WARRANTY IN THE UK Stronger cover. UK support. Real help when you need it.

TrailSurge Warranty+

Extra protection, backed by our UK team

For the first 12 months, TrailSurge Warranty+ gives you direct UK support on eligible faults affecting the main factory-fitted components — with practical help to get you back up and running.

UK-based fault support
Major factory-fitted components covered
Repair, parts or another suitable solution where eligible

Typical component cover: Eligible faults affecting major factory-fitted components, including the frame and forks, motor and drive system, controller, battery and BMS, charger, wiring, display, gears, brakes, and factory-fitted sensors or controls.

Koolux manufacturer warranty

Warranty period: 12 months against manufacturing defects.
What’s covered: Confirmed production faults affecting the original frame and factory-installed electrical or mechanical components.

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 BK10S combines legal-class performance with portability. With its 250 W motor, 48 V battery, fat tyres, and foldable frame, it's ideal for commuting and light off‑road adventures.

Power & Range
The 250 W motor with ~60 Nm torque gives solid hill climbing and smooth acceleration. The battery supports up to approximately 90 km per charge in assist modes.

Comfort & Safety
Ride smoothly on fat tyres and front suspension. Hydraulic disc brakes offer reliable stopping—even in wet conditions.

Smart Design Features
Folds compactly for easy storage or transport. The display shows speed, battery level, and assist mode. Battery is easily removable and lockable.

Built for Everyday Use
Equipped with front/rear LED lights, mudguards, Shimano 7-speed gearing, and a stable, lightweight frame. Ready for daily commuting or weekend outings.

Specifications

Collection	Electric Bikes
Brand	Koolux
Bike Type	Fat Tyre, City & Commuter, Delivery & Cargo
Motor Power	250W
Battery	48V 13AH
Top Speed	15.5 MPH
Acceleration Method	Regular Pedalling + Pedal Assist + Throttle Acceleration
Max Range	40 Miles
Charging Time	7+ Hours

Shock Absorbers	Front
Wheel Size	20inch x 4.0 Fat Tyre
Brakes	Dual Mechanical Disc Brakes
Gears	7 Speed Shimano Gears
Bike Weight	27KG
Max Climb	15 degrees
Max Rider Weight	120KG
Dimensions
Built Dimensions	165 × 58 × 116 cm (L × W × H)
Box Dimensions	143 × 30 × 70 cm (L × W × H)

A man rides a white electric bike on a paved path through a park. Tall buildings are visible in the background. Text on the image highlights the bike’s adjustable speed settings up to 45 km/h and compliance with regulations.

48V 13Ah Lithium Battery – Long Range & Secure

This high‑capacity 48 V 13 Ah lithium battery delivers an impressive range of 35‑90 km, giving you the freedom to ride further. The detachable battery compartment includes a safety lock so you can remove it for charging without worry.

A graphic of an electric bike’s battery shows its internal cells glowing green. Text highlights features: 48V/13Ah capacity, 5–7h charging time, 25–35KM range per charge, and Li-ion battery with a “Smart Chip.”.

Removable 48V 12Ah Battery – Fast Charge & High Capacity

With a removable 48 V 12 Ah battery rated at 576 Wh, you can enjoy long rides and quick recharging. The 4 A fast‑charging system powers up in hours and ensures a maximum range of around 70 km.

High‑Pressure Suspension Fork – Smooth Ride

A built‑in high‑strength steel shock absorber provides excellent cushioning and lubrication. The high‑pressure suspension fork smooths out bumps and potholes, giving you more control and comfort.