Is the Koolux BK10S easy to assemble?

The Koolux BK10S comes mostly assembled and only minor things need to be assembled. This should not take longer than 20-30 minutes to do.

Is the Koolux BK10S water resistant?

The Koolux BK10S is water-resistant and suitable for riding in light to moderate rain. It is not fully waterproof and should not be submerged. Short term, your product can get a little wet and be in the rain, but any long-term exposure can cause serious problems.

Is the Koolux BK10S Fat Tyre Electric Bike road legal?

Yes — this model is road legal in the UK. It’s classed as an EAPC (electric assist bicycle), so it can be ridden on public roads and cycle paths like a standard bike, without any issues from the police.

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

Pay monthly from £59.17/mo 6–12 months at checkout

Options shown at checkout. 18+ only. Subject to status & approval. T&Cs apply.

Complete your ride Save 15%

Add a helmet, lock or bike car rack before checkout.

Wulfsport Adult Astral Helmet

£72.24 £84.99

Six Peaks™ Strong Cycling D-Lock

£24.64 £28.99

Built & Delivered Ready To Ride Optional

Built, safety checked and delivered ready to ride by our team.

Usually 5–7 working days

£99.99

Product variants:

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Home Delivery Standard 3–5 working days, with Next Day available on selected items

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Standard Home Delivery 3–5 working days

Our standard tracked home delivery service for most UK mainland orders.

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30-day returns on unused items
Used items cannot be returned for change of mind

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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.

Warranty Page

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Representative APR (variable) 23.9%

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clearpay

Pay in 4 with Clearpay

4 interest free payments of £0.00

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Klarna.

Spread the cost with Klarna

3 monthly payments of £0.00

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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 Pedaling + 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

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.