Customer reviews on Trustpilot
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.
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 →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 →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
12 monthsof cover
UK-based warranty and after-sales support
Frame & forks · Motor & controller · Battery & charger · Factory-fitted electrics & mechanical parts
Fault assessment, warranty guidance and help arranging eligible repairs or replacement parts.
Contact our UK team with your order number and a few photos.
Normal wear, accidental damage, misuse and unauthorised modifications are excluded. Eligibility and remedies are subject to the full warranty terms.
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.
12 months against manufacturing defects.
Confirmed production faults affecting the original frame and factory-installed electrical or mechanical components.
Separate manufacturer terms apply. Warranty periods are not added together.
Frame & forks · Motor & controller · Battery & charger · Factory-fitted electrics & mechanical parts
Fault assessment, warranty guidance and help arranging eligible repairs or replacement parts.
Contact our UK team with your order number and a few photos.
Normal wear, accidental damage, misuse and unauthorised modifications are excluded. Eligibility and remedies are subject to the full warranty terms.
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.
12 months against manufacturing defects.
Confirmed production faults affecting the original frame and factory-installed electrical or mechanical components.
Separate manufacturer terms apply. Warranty periods are not added together.
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.
| Collection | Koolux Electric Bikes |
|---|---|
| Brand | Koolux |
| 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 |
Check rider measurements and sizing before you order.
Sizes are a guide. Rider proportions, footwear and setup can affect fit.
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.
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.
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.
1 x Koolux BK10S Fat Tyre Electric Bike
1 x Charger
2 x Keys
1 x Tool Kit
1 x User Manual
