How fast can the Koolux X12 Electric Bike go?

The listed top speed is 28 MPH. Real-world speed varies with rider weight, terrain, battery level and which speed/assist mode you’re using.

Is the Koolux X12 Electric Bike road legal in the UK?

Many e-bikes are supplied with a UK-compliant assist setting (25 km/h / 15.5 mph). If you use higher-speed or higher-power modes on public roads, it may be treated as a motor vehicle and need registration, tax and insurance. Always ride to the current rules.

Is the Koolux X12 easy to assemble?

The Koolux X12 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 X12 waterproof?

The Koolux X12 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 this bike Road Legal?

This model is designed for off-road/private land use and is not intended for public roads, cycle lanes, or pavements. It does not meet UK road-legal e-bike requirements (including the 250W limit), so it shouldn’t be used as an EAPC on public highways. Please ride only on private land and always with the landowner’s permission.

How long does delivery take?

Delivery for the Koolux X12 will take on average 3-5 bays to arrive to you Free Delivery on all orders. Tracking information is provided upon dispatch.

What is your return policy?

We offer a 30-day return policy on the Koolux X12 for unused items in their original packaging. Full details are available on our Returns page.

Do you provide a warranty?

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.

Koolux X12 Electric Bike

Name: Koolux X12 Electric Bike
Brand: KOOLUX
SKU: KOOLUX-X12-GRAY
Price: 999.99 GBP
Availability: InStock
Rating: 4.75 (4 reviews)

Motor

500W

Battery

Speed

28 MPH

Range

34-75 MILES

£1,099.99 £999.99

In stock 5 sold this week

Pay in 3 £333.33×3

Pay monthly £83.33/mo

Free UK Delivery

Click & Collect or Home Delivery

2-Year Warranty

Manufacturer-backed cover

UK Support Team

Quick help & support.

Official KOOLUX

Genuine brand new stock

Product variants:

Trustpilot Rated 4.8

Home Delivery

Typical delivery: 3–5 working days (UK mainland)
Tracking provided once dispatched
Courier: DPD / Parcelforce / DX / BJS (item-dependent)

Returns

Returns accepted within 30 days for unused items
No returns for change of mind once used

Click & Collect

Collection from our Nuneaton store

Collection will be available from our Nuneaton store in around 5–6 working days
After you have ordered, we’ll contact you to arrange a day and time for collection
Please bring your order confirmation and photo ID when collecting

Store location

Need the exact address before ordering? Contact us and we’ll confirm collection details.

Warranty Information

1-year manufacturer warranty (manufacturing defects under normal use)
Covers faulty components or defects confirmed by the manufacturer
Excludes wear & tear items (e.g. tyres, tubes, brake pads), accidental damage, misuse, water ingress, and unauthorised modifications
If an issue occurs, contact our support team with your order number plus photos/video where possible
We’ll help diagnose the fault and arrange the next step (repair, replacement parts, or warranty support where applicable)

0% APR Finance Options

Koolux X12 Key Features

Powerful 500W brushless rear motor for Confident Riding
The KOOLUX X12 features a high-efficiency 500W brushless rear motor, delivering smooth acceleration and reliable torque for hills, city riding, and mixed terrain.

Long-Range Lithium-ion battery for Everyday Adventures
Designed to go the distance, the battery system provides a real-world range of up to 55–120 km depending on riding mode, terrain, and rider weight.

Comfort-Focused Design for Stability and Control
Wide tyres and a well-balanced frame help absorb road vibrations and uneven surfaces, keeping rides comfortable and confidence-inspiring.

Smart Display and Assist System
Ride with full control using a clear digital display showing speed, battery level, and distance. Multiple pedal-assist levels help tailor power delivery to your riding style.

Road-Legal Configuration
Supplied in a 25 km/h (road legal setting) configuration for UK compliance. Always follow local e-bike regulations.

Koolux X12 Specifications

Collection	Electric Bikes
Motor Power	500W
Top Speed	28 MPH
Max Range	34-75 Miles

Wheel Size	20*4.0 inch

What inside the box?

1X Koolux X12 Electric Bike (Mostly Built)

1X Charger

2X Keys

1X Assembly Tools

1X Assembly User Manual

Happy with it

Got this as a replacement for an older model and it feels like a step up. Pedal assist comes in smoothly and doesn't feel jerky. Feels planted and stable once you're up to speed. Handles nicely and feels stable once you’re moving. Happy we went for it.

Happy with it

Really pleased with it overall. Hills are noticeably easier with assist on the higher levels. Pedal assist comes in smoothly and doesn't feel jerky. Handles nicely and feels stable once you’re moving. Exactly what we needed.

Thanks for your review — glad you’re enjoying it!

Comfortable

After a couple of weeks using it, I'm impressed. Controls are simple and the display is easy to read. Pedal assist comes in smoothly and doesn't feel jerky. Handles nicely and feels stable once you’re moving. Feels well made.