KOOLUX BK5S

Perfect For

• Apartment Dwellers: The ultra-compact 80 x 50 x 68 cm folded size and 24 kg weight make the BK5S perfect for residents without ground-floor access, storage space, or dedicated bike parking. Store in corners, cupboards, or under desks without consuming valuable living space.
• Multi-Modal Commuters: Combine cycling with trains, buses, and other public transport effortlessly. The compact folded size and lightweight construction enable genuine portability on public transport without blocking access or inconveniencing other passengers.
• Smaller Riders: The 16" wheels, compact frame, and accessible geometry make the BK5S ideal for shorter riders, younger riders (14+), or anyone who finds standard bikes too large or intimidating to manage comfortably.
• Office Workers: The key start security, removable battery for desk charging, and ultra-compact folded size make the BK5S perfect for urban office commuters who need to store bikes indoors and charge batteries at their workstation.
• Caravan and Motorhome Owners: The exceptional compactness enables easy storage in recreational vehicles, providing convenient transport at campsites and holiday destinations without consuming excessive vehicle space.
• Entry-Level E-Bike Riders: The compact size, accessible controls, simple operation, and manageable weight make the BK5S perfect for riders new to electric bikes who want straightforward, confidence-inspiring performance.
• Space-Constrained Storage: Ideal for anyone with limited storage space—small flats, shared accommodation, narrow hallways, or locations where standard bikes simply won't fit or are impractical to store.
• Last-Mile Delivery: The practical luggage rack, compact size for easy manoeuvring, and 120 kg load capacity make the BK5S suitable for food delivery, courier work, and urban logistics applications.
• Daily Urban Commuters: Conquer city commutes with responsive electric assistance, weather protection, safety lighting, and the ability to store the bike at the office, in the lift, or under your desk.
• Budget-Conscious Riders: The BK5S delivers exceptional value, combining genuine portability, quality components, comprehensive accessories, and reliable performance at an accessible price point.
• Train and Tube Commuters: The genuinely compact folded size meets public transport requirements without requiring expensive season ticket upgrades, making the BK5S perfect for extending commuting radius.

Ultra-Compact Engineering: Revolutionary Portability

The BK5S's 16" wheel configuration represents revolutionary engineering that prioritizes genuine portability without sacrificing functionality. The ultra-compact dimensions enable storage in locations impossible for standard electric bikes—fitting in car boots alongside luggage, storing in apartment corners without dominating the space, carrying on public transport without blocking gangways, and lifting into upper-floor flats without assistance. This engineering achievement transforms the BK5S from a bike into a truly portable personal mobility device.

Lightest in Class: 24kg Portability

At just 24 kg, the BK5S achieves exceptional portability whilst maintaining robust construction and 120 kg load capacity. This weight represents the lightest foldable electric bike in the KOOLUX range, making it genuinely manageable for daily carrying, lifting onto trains, carrying upstairs, and managing independently without assistance. The weight optimization doesn't compromise structural strength—the Q195 carbon steel frame provides excellent durability.

Under-Seat Battery Access: Innovative Convenience

The removable battery's under-seat location represents intelligent design that enables convenient charging without bringing the entire bike indoors. Simply fold the saddle, remove the battery, and charge anywhere convenient—at your desk, in your flat, in the office, or any location with a power socket. This convenience is perfect for riders without ground-floor access or secure outdoor storage.

Key Start Security: Enhanced Protection

The integrated key start system provides effective theft deterrent by immobilizing the electrical system when not in use. Combined with the included chain lock, this security gives confidence when parking in public areas, at train stations, or outside shops. The key start ensures the bike cannot be operated without authorization.

TÜV Certification: European Safety Excellence

TÜV certification demonstrates the motor meets strict German safety and quality standards—among the most rigorous in Europe. This certification ensures reliable performance, proper electrical safety, quality construction, and adherence to European technical standards. TÜV certification provides exceptional peace of mind regarding safety and quality.

StVZO Lighting Compliance: German Safety Standards

The StVZO-certified front headlight ensures the BK5S meets strict German road safety standards for bicycle lighting. This premium lighting system provides powerful, focused illumination whilst preventing glare for other road users, ensuring safe night-time riding in compliance with the highest European safety regulations.

IP54 Weather Protection: All-Season Reliability

The IP54 waterproof rating ensures reliable performance regardless of weather conditions. Protected against dust and water splashes from any direction, the BK5S handles rain, puddles, wet grass, and challenging conditions without electrical failure. This weather protection ensures year-round reliability and long-term durability.

Shimano Quality: Proven Reliability

The Shimano 1-speed transmission represents proven Japanese engineering quality, delivering smooth shifting, long-term reliability, and excellent value. Shimano components are renowned for durability and performance, ensuring the BK5S's gearing system provides years of trouble-free operation.

Multi-Modal Transport Excellence

The BK5S excels at multi-modal transport—combining cycling with trains, buses, trams, and other public transport for seamless urban journeys. The ultra-compact folded size meets public transport requirements, the lightweight construction enables easy carrying, and the quick folding mechanism allows rapid transitions between riding and carrying modes.

Perfect Entry-Level E-Bike

The BK5S represents an excellent entry point to electric cycling. The compact size inspires confidence, the accessible controls are intuitive, the manageable weight prevents intimidation, and the comprehensive included accessories eliminate additional purchases. New riders will appreciate the straightforward operation and supportive performance.

UK Road Legal Compliance

The BK5S is fully UK road legal when used at 25 km/h with the TÜV-certified 250W motor. Riders must be at least 14 years old. The higher speed capability (32 km/h unlocked) and throttle function are provided for use on private land only, allowing riders to enjoy enhanced performance whilst maintaining legal compliance on public roads.

Complete Package: Ready to Ride

The comprehensive accessory package ensures the BK5S arrives ready for immediate use: battery, charger, 16-in-1 tool kit for maintenance, quick operation guide, detailed user manual, bicycle chain lock for security, bicycle pump for tyre maintenance, and throttle for electric-only operation. This complete package eliminates the frustration and expense of sourcing additional accessories.

The KOOLUX BK5S ultra-compact foldable electric bike represents revolutionary urban mobility engineering—combining genuine portability (24 kg, 80x50x68 cm folded), TÜV-certified quality, comprehensive features, and reliable performance in the smallest, lightest package available. Perfect for apartment dwellers, multi-modal commuters, smaller riders, and anyone demanding true portability, the BK5S proves that compact design and full functionality can coexist in one exceptional electric bike.