Koolux BK6S 4.0 Electric Bike
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Estimated 3–7 working days. Your shipment will have tracking information where available.
All EU orders are dispatched through our European warehouse network, with taxes and standard delivery included in the displayed price.
View delivery information →Dispatch dates depend on incoming stock. Please contact us to confirm the current lead time.
Enquire about delivery →Contact our team to ask about availability or a suitable alternative.
Check availability →Delivery estimates are not guaranteed. Optional services, if available, are priced at checkout.
Returns & cancellations 14-day withdrawal rights · Return information
For most eligible online purchases, EU consumers have 14 days after delivery to notify us that they wish to withdraw, without giving a reason.
Return-shipping responsibilities, exceptions and any deductions permitted by law depend on the circumstances. Your statutory rights remain unaffected.
We may also offer an additional 30-day return option for eligible unused and unopened items, subject to our policy.
Read our returns policy →Warranty & customer support Order assistance and applicable legal guarantees
Our team can help with product questions, troubleshooting and eligible warranty or fault claims.
Qualifying EU consumer purchases are generally protected by a minimum two-year legal guarantee for goods that are faulty or not as described. Some countries provide longer protection. These rights are separate from any optional manufacturer or commercial warranty.
Please include your order number and a description of the issue when contacting us.
Contact customer support →No import fees or extra taxes All taxes and standard delivery included
All TrailSurge.eu orders are fulfilled through our European warehouse network. We take care of applicable taxes and any customs-related costs.
No import fees, customs invoices or extra VAT bills on delivery. Standard delivery is included in the displayed price.
No unexpected charges on arrival. Optional services, if selected, are clearly priced before you complete your purchase.
Questions about your order? →
Included with your purchase
TrailSurge Warranty+
12 monthsof cover
UK-based warranty and after-sales support
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.
Contact our UK team with your order number and a few photos.
View warranty detailsHide warranty details
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.
Koolux manufacturer 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.
Separate manufacturer terms apply. Warranty periods are not added together.
View warranty details Hide warranty details
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.
Contact our UK team with your order number and a few photos.
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.
Koolux manufacturer 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.
Separate manufacturer terms apply. Warranty periods are not added together.
Description
Quick Summary
The KOOLUX BK6S 4.0 combines rugged fat‑tyre traction with a powerful 750W motor and a high‑capacity 48 V 13 Ah battery. Designed for both urban streets and off‑road paths, it delivers stable handling and dependable performance.
Smooth Power Delivery
The 750W hub motor offers responsive acceleration and smooth pedal‑assist across seven levels, letting you tackle hills and headwinds without strain. A thumb throttle provides instant power when you need a boost.
Comfort & Control
Wide 4.0″ tyres and front suspension absorb bumps and maintain grip on loose or uneven surfaces. Dual mechanical disc brakes ensure consistent, controlled stopping power in all weather.
Smart Battery System
A lockable, removable 48 V 15 Ah battery provides long-range capability and convenient off‑bike charging. Built‑in protection circuits guard against over‑charge, over‑discharge, and overheating for safe, reliable use.
Tech You Can Trust
The clear backlit LCD displays speed, battery level, distance travelled, and assist mode at a glance. Simple handlebar controls let you switch assist levels and monitor ride data easily.
Built for Everyday Use
With its durable frame, fat‑tyre stability, and straightforward folding rack mount design, the BK6S 4.0 is ready for daily commutes, weekend adventures, and everything in between—wherever you choose to ride.
Specifications
| Collection | Koolux Electric Bikes |
|---|---|
| Brand | Koolux |
| Motor Power | 500W |
| Battery | 48V 15AH |
| Top Speed | 15.5 MPH |
| Max Range | 41 Miles |
| Charging Time | 5+ Hours |
| Shock Absorbers | Front |
| Brakes | Dual Mechanical Disc Brakes |
| Bike Weight | 27KG |
| Max Climb | 15 degrees |
Size & Rider Fit
Check rider measurements and sizing before you order.
More measurements & dimensions
- Built dimensions
- 182 × 60 × 110 cm (L × W × H)
- Box dimensions
- 93 × 55 × 76 cm (L × W × H)
Sizes are a guide. Rider proportions, footwear and setup can affect fit.
What’s Included in the Box?
1 x Koolux BK6S 4.0 Electric Bike
1 x Charger
2 x Keys
1 x Tool Kit
1 x User Manual
