How fast can the Koolux X12 Pro Electric Bike go?

Top speed depends on the model and setup. Real-world speed varies with rider weight, terrain, battery level and which speed/assist mode you’re using.

Is the Koolux X12 Pro 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 Pro Electric Bike easy to assemble?

The Koolux X12 Pro 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 X12 Pro Electric Bike water resistant?

The Koolux X12 Pro 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 X12 Pro Electric Bike – alternate product view

Certified

Koolux X12 Pro Electric Bike

SKU: TS-KOOLUX-X12PRO-ELECTRIC-BIKE-GRAY-RED

Motor

250W

Battery

48V 13AH

Speed

15.5 MPH

Range

43.5 MILES

£1,099.99 £759.99

In stock 20 sold this week

Klarna £253.33 ×3

Clearpay £190.00 ×4

PayPal £253.33 ×3

—/mo 12 months 0% interest

Finance

Monthly finance Interest-bearing Rates & terms shown at checkout

Finance options and eligibility confirmed at checkout. Subject to approval.

Product variants:

Choose your delivery setup

Free Delivery

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Fulfilled from our Birmingham warehouse

Rated Excellent on Trustpilot

Home Delivery Standard & next-day options

Standard delivery Usually 3–5 working days

Tracked delivery to your door.

Next-day delivery Selected in-stock items

Select at checkout if available for your order.

Trusted delivery partners

Options and charges shown at checkout. Remote areas may take longer.

Click & Collect Choose your collection date

TrailSurge Nuneaton · Unit 62 Centenary Business Centre, Nuneaton, CV11 6RY Monday–Friday · 10am–4pm

Preferred collection date

Available from — · 7 working days ahead

Select Pickup · TrailSurge Nuneaton at checkout. We'll confirm when your order is ready; dates are requested, not guaranteed.

Returns & Cancellations 14-day cancellation · 30-day unopened returns

Change of mind Within 14 days of delivery

Unused, unopened items Up to 30 days

Policy conditions and return costs may apply. Your statutory rights are unaffected.

Read returns policy

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 .

TrailSurge Warranty+

12 months

Cover for eligible manufacturing faults, with support from our UK team.

What’s covered

Frame & forks · Motor & controller · Battery & charger · Factory-fitted electrics & mechanical parts

Here when you need us

Fault assessment, warranty guidance and help arranging eligible repairs or replacement parts.

Cover & exclusions

Normal wear, accidental damage, misuse and unauthorised modifications are excluded. Eligibility and remedies are subject to the full warranty terms.

Need to make a claim?

Contact TrailSurge with your order number, a description of the fault and clear photos or a video. Our team will assess the issue and explain the next steps.

Description

Powerful 750W brushless rear motor for Confident Riding
The KOOLUX X12PRO features a high-efficiency 750W 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 70–120 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.

Specifications

Collection	Electric Bikes With Throttle
Motor Power	250W
Battery	48V 13Ah
Top Speed	15.5 MPH
Max Range	43.5 Miles
Charging Time	5-6 Hours

Wheel Size	20 x 4.0" tyres
Brakes	Hydraulic Brakes
Bike Weight	35.5 KG
Max Climb	25"