Koolux X9 Mini Fat Tire Electric Bike
SKU: N50737
SPEED15.5 Mph
RANGE62 Miles
MOTOR250W
BATTERY13Ah
CHARGING7-8 Hours
WEIGHT77 lbs
Adjustable Cycle Helmet£38.99
Front and Rear Light Set£44.99
In stock now, a similar model
Samebike LO26-II-YD Folding Electric Mountain Bike£689.00In stockView
This Model Is Fully Compliant With UK Road Regulations
This bike is built to comply with UK Electrically Assisted Pedal Cycle (EAPC) regulations, meaning it can be used on public roads and cycle paths without registration, tax, or a licence. Motor assistance is limited to 250W and cuts off at 15.5 mph (25 km/h).
See UK LegislationThis one carries 624 Wh of battery. The maker quotes 62 mi; in mixed riding with some hills, expect nearer 47 mi. A full charge costs about £0.17. Across a year that is roughly £984.00 less than making the same journeys by car, so the bike pays for itself in about 11 months. Everything here is worked out from this bike's own specification. Estimates, not promises: the assumptions are printed underneath.
Range you can expect
| Low assist, flat roads | 62 mi |
|---|---|
| Mixed riding, some hills | 47 mi |
| Full assist, loaded or hilly | 34 mi |
| Riding time on a charge | 4 h |
What it costs to run
| A full charge | £0.17 |
|---|---|
| Every 100 miles | £0.28 |
| Electricity for a year | £6.00 |
| The same year by car | £990.00 |
| You keep | £984.00 |
| Pays for itself in | 11 months |
Worked out from the specification
| Battery energy | 624 Wh |
|---|---|
| Energy per mile | 10.1 Wh |
| Charger output | 1.9 A |
| Power to weight | 7.2 W/kg |
| You can carry | 265 lb |
Based on £0.245 per kWh, £0.45 per mile to run a small car, and 2,200 miles a year. Charging is costed at the socket, not at the battery.
Sixteen-inch wheels with four-inch tyres
The KOOLUX X9 Mini runs 16 × 4 inch tyres, carries a 48V 13Ah battery and folds, at £839.
250W and 15.5 mph: it meets the EAPC rules, so there is no licence, no tax and no registration.
Sixteen inches with four inches of tyre
That is an unusual pairing: the smallest wheel KOOLUX makes, with a full fat tyre on it.
- The small wheel keeps the bike short and the centre of gravity low
- The four-inch tyre floats on sand and soft ground
- It is the combination that makes a compact bike work off the tarmac
- And it unfolds to only 135 × 63.5 × 106 cm
KOOLUX publishes rated and peak power separately
Two hundred and fifty watts rated, five hundred peak.
It is the rated figure that the law is written about, and it is in order. The peak is what the motor can deliver briefly, and it is why a 16-inch wheel with a fat tyre gets moving at all.
Sixty-two miles, and take the lower end of that claim
KOOLUX claims 100 to 180 km from a 48V 13Ah pack of 624 watt hours.
Our table carries 62 miles, the bottom of that band, and even that assumes flat ground and real pedalling. One hundred and eighty kilometres from 624 watt hours on four-inch tyres is a figure we would not repeat without saying so. The panel below does the arithmetic.
Disc brakes and an IP54 rating
Discs front and rear, with protection against dust and splashing water rather than a jet wash.
KOOLUX does not say whether the discs are hydraulic or cable, and we will not guess. Ask us before you order and we will have them confirm it.
265 lbs of payload, and it is low for this bike
Lower than 96% of our catalogue: you and everything on the bike, together.
The machine itself is 77 lbs, so subtract your own weight before you order. Seven to eight hours for a full charge, and the box is 120 × 31 × 76 cm at 39.7 kg.
Before the first ride, and who it is for
KOOLUX publishes fifteen rows for this model. There is no frame material and no torque figure, and both stay empty in the table below rather than being invented.
- Unfold and lock the frame and the stem, then check both again after the first hour
- Bed both disc brakes in at walking pace
- Inflate both tyres: a 16-inch wheel loses pressure faster than a large one
- Run the tyres soft for grip, firmer for range
- Allow seven to eight hours for the first charge
Buy it if you want fat-tyre capability on the shortest wheelbase KOOLUX builds. The short wheelbase makes it lively rather than stable, which is the trade you are making.
- BRAND
- KOOLUX
- CATEGORY
- Fat Tire
- MOTOR POWER
- 250W
- RANGE
- 62 Miles
- SPEED
- 15.5 Mph
- BATTERY
- 13Ah
- WEIGHT
- 77 lbs
- CHARGING TIME
- 7-8 Hours
- BRAKE SYSTEM
- Front & Rear Disc Brake
- FRAME MATERIAL
- N/A
- MAXIMUM LOAD
- 265 lbs
- INPUT VOLTAGE
- 48V
- TIRE SIZE
- 16 inch
- TORQUE
- N/A
The Koolux X9 Mini Fat Tire Electric Bike states 250W, 62 Miles and 15.5 Mph, and below it is set against the DYU A1F Electric Folding Bike. Every figure the two disagree on is marked. Choose a different bike to compare it with whichever one you are also considering.
7 of 10 specifications differ. View DYU A1F Electric Folding Bike
- Is the KOOLUX X9 MINI suitable for daily commuting?
- Yes, it is designed for efficient and comfortable urban transportation.
- Is the KOOLUX X9 MINI easy to store?
- Yes, its compact design makes it convenient for storage and transport.
- Does the KOOLUX X9 MINI offer a comfortable ride?
- Yes, it provides stable handling and smooth performance for everyday use.
- Is the KOOLUX X9 MINI suitable for city riding?
- Yes, it is ideal for city streets, paved roads, and short-distance travel.
- Are the electric bikes brand new?
- Yes. All electric bikes sold by BikTron are brand new, factory-sealed, and sourced directly from authorised manufacturers and official distributors.
- How do I choose the right electric bike for me?
- Pick a bike based on how you plan to ride. City bikes are great for commuting, folding bikes work well if you need compact storage, mountain bikes handle hills and mixed terrain, and cargo bikes are ideal for carrying shopping or loads. If you are not sure, our Bike Quiz can help.
- Are the batteries original and certified?
- Yes. Every electric bike battery is brand new and original from the manufacturer, with full safety certification and performance testing.
- Are the bikes tested before shipping?
- Yes. Each e-bike goes through a quality check before dispatch, covering electronics, brakes, motor response, and battery performance.
- Do electric bikes come with a warranty?
- Yes. All electric bikes from BikTron include a manufacturer warranty. Duration depends on the brand and model. Most bikes include a 12-month warranty as standard.
- How long does delivery take?
- Standard UK delivery usually takes 2 to 7 business days. Remote areas may take a little longer. You will receive a tracking link by email once your order is dispatched.
- Which payment methods do you accept?
- We accept Visa, Mastercard, PayPal, Apple Pay, Google Pay, and Klarna buy-now-pay-later. All payments are processed securely.
- Can I return my electric bike?
- Yes. You can ride the bike and still return it. Tell us within 30 days of delivery and we book the courier and collect it from your door. Contact us first and we will guide you through the process.
- Do the bikes need assembly?
- Most electric bikes arrive 85 to 90 per cent pre-assembled. You will usually need to attach the handlebars, pedals, and adjust the seat. A basic tool set is often included.
- Are BikTron electric bikes legal to ride in the UK?
- Yes. All bikes sold by BikTron that meet UK EAPC rules (250W motor, max 15.5 mph assisted speed, pedal-assisted only) are fully road-legal. You do not need a licence, tax, or insurance to ride them on public roads. Riders must be at least 14 years old.
- What about the electric scooters?
- Those are different, and the law treats them differently. A privately owned e-scooter cannot legally be ridden on a public road, pavement or cycle lane in the UK, whoever sold it. We sell ours for private land use only, with the landowner's permission, and every scooter product page says so. If you want something you can ride to work, choose an electric bike.
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.
- 30-day return window — if the bike is not right for you, send it back
- Ride it. It needs to come back clean, undamaged and complete, with the charger, tools and manual
- A refund or replacement is issued after we receive and check the return
Please note:
- For a change of mind we book the collection and deduct its cost from your refund, and we tell you the amount before we book it
- 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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Helpful reading
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