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Koolux BK6S 4.0 Electric Bike
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TrailSurge is a UK company and VAT registered too: Company No. 16935369 · VAT No. 521226239.
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Trail Surge Ltd · Unit 62, Centenary Business Centre, Nuneaton, CV11 6RY
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14 days to cancel after delivery. Up to 30 days for unused, unopened items.
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TrailSurge Warranty+
1 year of cover UK support
Worth £159 Included
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What’s covered
Frame, forks, motor, controller, battery, charger and factory-fitted electrical and mechanical parts.
Cover & exclusions
Normal wear, accidental damage, misuse and unauthorised modifications are generally excluded.
How to claim
Contact our UK team with your order number and a few photos.
Manufacturer warranty · Koolux
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.
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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
Spare Parts for This Model
We stock a range of spare parts in the UK and can source additional components for this model. Contact our team to check prices, compatibility and availability.
