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KOOLUX BK6S Fat Tyre Electric Bike

SKU: P38148In Stock

£599.00
£849.00Save £250.00
3 payments of £199.67 at 0% withklarna
  • SpeedSPEED19.9 Mph
  • SpeedRANGE56 Miles
  • SpeedMOTOR500W
  • SpeedBATTERY13Ah
  • SpeedCHARGING5.5 Hours
  • SpeedWEIGHT73 lbs
UK Delivery: 2–7 business days
Free standard UK delivery on most bikes
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This Bike Is Not Road Legal. Private Land Use Only.

This bike cannot be ridden on public roads, pavements, or cycle paths in the UK. Its motor output and assisted top speed exceed the legal limits set by the UK Electrically Assisted Pedal Cycle (EAPC) regulations, which cap electric bikes at 250W motor power and 15.5 mph (25 km/h). Because this bike exceeds both thresholds, it is classified as a motor vehicle and would require registration, insurance, and a valid licence to use on public roads. This bike is designed exclusively for use on private land such as farms, estates, and off-road tracks where road traffic law does not apply.

See UK Legislation

Conquer rough trails and city streets

Take on any adventure with the KOOLUX BK6S, built around tough 4.0-inch Pro Wide tyres that give you outstanding grip and puncture resistance. Whether you’re riding across snowy bridleways or heading down to the beach, this electric bike handles it all with confidence. It’s the versatile, reliable companion you need for exploring the great British outdoors.

KOOLUX BK6S electric bike with 20-inch fat tires and 500W motor

Power, range and comfort combined

A punchy 500 W motor delivers brisk acceleration and smooth progress, while the 20 x 4.0-inch tyres keep you stable on everything from muddy towpaths to gravel tracks. The removable 48 V 13 Ah battery gives you a real-world range of 28 to 56 miles, so daily commutes and weekend escapes are well within reach. Choose from three riding modes – pure electric, pedal assist or manual – to match your mood and the terrain ahead.

Advanced dual suspension with front and rear shock absorbers smooths out potholes and bumps, and bright LED lights front and rear help you stay seen on dark lanes. A smart LCD display keeps speed, battery level, distance and mode right in your eyeline. With a top assisted speed of 20 mph and a sturdy aluminium frame that carries up to 19 stone, the BK6S is ready for anything – and it folds down neatly for storage or popping in the boot.

KOOLUX BK6S 500W electric bicycle with 48V 13Ah battery and 90km range

High-torque motor for steep climbs

The 500 W motor packs 60 Nm of torque, giving you strong pull away from the lights and effortless hill climbing on country roads. Peak power can reach 750 W when you need an extra boost, yet the bike always feels controlled and planted. It’s performance that makes every ride, from city errands to off-road exploring, genuinely enjoyable.

Green KOOLUX BK6S electric bike with 20x4.0 fat tires and 45km/h speed

Long-range battery you can remove

The 48 V 13 Ah lithium battery slots out easily for charging at home or the office, and delivers between 28 and 56 miles on a full charge – depending on terrain, rider weight and the mode you use. A full top-up takes around 5 to 6 hours, so you can plug in overnight and be ready for the morning commute. It’s practical, dependable power that fits into your daily routine.

Fat 20 x 4.0-inch tyres roll smoothly over sand, snow and forest trails, while the front suspension keeps the ride comfortable on uneven ground. The BK6S folds up compactly, making it a brilliant choice for mixed-mode journeys – ride to the station, fold and hop on the train, then unfold for the last few miles. It opens up more possibilities and makes every trip a pleasure.

Stay informed at a glance

Ride with confidence thanks to the crisp LCD display that puts real-time data right where you need it. You'll always know your current speed, remaining battery life, and more without breaking focus on the road ahead. It's a small detail that makes every journey feel more connected and controlled.

Aluminum frame of KOOLUX BK6S electric bike with 500W motor

Confident stopping and all-day comfort

Powerful front and rear disc brakes deliver quick, reassuring stopping power when you need it most, whether you're navigating busy city streets or country lanes. Bright LED headlights and reflectors keep you visible on darker rides, helping you feel safer after sunset. The lightweight aluminium frame folds down neatly, making storage at home or in the office refreshingly simple.

Lithium-ion battery pack for KOOLUX BK6S electric bike 48V 13Ah

Grip and stability on any surface

Those 4.0-inch fat tyres give you the traction to tackle everything from snowy paths to sandy trails without a second thought. The front suspension soaks up bumps and vibrations, so you enjoy a smoother ride even when the tarmac ends. Whether it's gravel, wet grass, or uneven bridleways, this setup keeps you rolling steadily.

KOOLUX BK6S electric bike with 20-inch wheels and fat tires

Three ways to ride your way

Choose pedal-assist mode and the motor gently boosts your effort, making hills feel flatter and longer rides more achievable. Switch to pure electric mode with the included throttle for effortless cruising on private land, where UK regulations permit. Or simply ride it like a traditional bike using the 7-speed Shimano gears for a proper workout on familiar routes.

20-inch wheel size on KOOLUX BK6S electric bicycle with fat tires

See and be seen after dark

Riding home on unlit country lanes or through dimly lit city streets feels far safer with the bright LED front light. It throws a clear beam ahead so you can spot potholes and kerbs early, while also making sure drivers and pedestrians notice you from a distance. This light meets UK road standards and carries K-Code certification, so you can trust it to perform reliably whenever you need it.

500W motor on KOOLUX BK6S electric bike for high-speed riding

Why the KOOLUX BK6S fits your life

Compared to similar models like the Hitway BK6S, this bike delivers noticeably more punch and efficiency, thanks to its robust motor and chunky tyres that handle everything from wet high-street cobbles to gravel bridleways. When the ride is over, it folds down compactly enough to tuck into a hallway or boot, making it a brilliant choice for weekday commutes and weekend escapes alike.

Inside the box you will find the KOOLUX BK6S with its 48V 13Ah battery already fitted, a smart charger, an LCD display that tracks battery level, speed, mileage, assist mode and fault codes, plus a twist throttle for optional use off-road. A printed manual walks you through setup. Please note: the bike is fully compliant with UK public road regulations when used in pedal-assist mode; the included throttle is intended for private land only.

KOOLUX BK6S electric bike CE compliance certificates displayed

Common questions from UK riders

Your real-world range depends on the assist level you choose, your weight, and the terrain. You will drain the battery faster on steep, uneven tracks or in higher power modes, while gentle eco-mode cruising through town can stretch every charge much further.

Charging is simple: plug the supplied charger into a mains socket, then connect it to the bike’s charging port. For the healthiest battery, aim to charge at room temperature and avoid leaving it plugged in unnecessarily long after it is full. Store the battery in a dry, temperate spot – extreme heat or cold can shorten its life – and try not to run it completely flat before recharging.

KOOLUX BK6S at a glance

Built around a lightweight aluminium frame, this bike rolls on 20-inch by 4-inch fat tyres that soak up bumps and give you grip on loose or wet surfaces. A 7-speed gearset and mechanical disc brakes put you in full control, while the rear hub motor delivers 500W of continuous power with a peak of 750W for steep climbs. The 48V 13Ah lithium battery charges in 5 to 6 hours and can take you between 28 and 56 miles on a single charge, depending on conditions. The whole bike weighs about 73 lbs and can carry a rider up to 19 stone.

Your delivery includes the KOOLUX BK6S, a lock, an air pump, a charger, a set of tools, and the owner’s manual. The throttle is supplied separately for optional fitting if you plan to ride on private land, keeping the bike fully UK road-legal in standard trim.

KOOLUX BK6S electric bike EAN barcode 9331774562717

Fits riders from 5ft 5in to 6ft 5in

This e-bike adapts to a wide range of rider heights, from 5ft 5in up to 6ft 5in, thanks to an adjustable handlebar height of 45 to 50 inches and a standover clearance of 33 to 42 inches. The 20-inch wheels and 45-inch wheelbase create a stable, comfortable ride whether you’re commuting through city traffic or exploring country lanes. When space is tight, it folds down to just 38 by 15 by 30 inches, sliding neatly into a hallway cupboard or car boot.

KOOLUX BK6S electric bike weight 33.2 kg specification
  • BRAND
    KOOLUX
  • CATEGORY
    Fat Tire
  • MOTOR POWER
    500W
  • RANGE
    56 Miles
  • SPEED
    19.9 Mph
  • BATTERY
    13Ah
  • WEIGHT
    73 lbs
  • CHARGING TIME
    5.5 Hours
  • BRAKE SYSTEM
    Mechanical Disc
  • FRAME MATERIAL
    Aluminium Alloy
  • MAXIMUM LOAD
    265 lbs
  • INPUT VOLTAGE
    48V
  • TIRE SIZE
    20 inch
  • TORQUE
    60 Nm

Secure checkout and fast UK delivery on every order.

  • Free standard UK delivery on most bikes — 2 to 7 business days
  • Express delivery may be available on request
  • Full tracking included with every order
  • Pay securely with Visa, Mastercard, PayPal, Apple Pay, Google Pay, or Klarna
  • 0% finance available through Klarna at checkout

Before you order:

  • Delivery is to UK mainland addresses — some remote areas may have a small surcharge
  • Most bikes arrive 85–90% pre-assembled and include basic tools for setup
  • If you are unsure about sizing or specs, contact us before you buy

Full details at Payment & Shipping.

Simple and fair terms so you can buy with confidence.

  • 14-day return window — if the bike is not right for you, send it back
  • The bike must be unused, in original packaging, with all accessories included
  • A refund or replacement is issued after we receive and check the return

Please note:

  • Returns for change of mind must meet the unused and original condition requirement
  • If we sent the wrong item or it arrived faulty, we cover return shipping in full
  • All bikes include a 12-month manufacturer warranty as standard

Full details at Returns & Refunds and Warranty.

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