ONESPORT OT05 Electric Mountain Bike
SKU: X79882In Stock
SPEED15.5 Mph
RANGE75 Miles
MOTOR250W
BATTERY18.2Ah
CHARGING8-10 Hours
WEIGHT62 lbs
Adjustable Cycle Helmet£38.99
Front and Rear Light Set£44.99
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 655 Wh of battery. The maker quotes 75 mi; in mixed riding with some hills, expect nearer 56 mi. A full charge costs about £0.18. Across a year that is roughly £985.00 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 | 75 mi |
|---|---|
| Mixed riding, some hills | 56 mi |
| Full assist, loaded or hilly | 41 mi |
| Riding time on a charge | 4 h 50 min |
What it costs to run
| A full charge | £0.18 |
|---|---|
| Every 100 miles | £0.24 |
| Electricity for a year | £5.00 |
| The same year by car | £990.00 |
| You keep | £985.00 |
| Pays for itself in | 11 months |
Worked out from the specification
| Battery energy | 655 Wh |
|---|---|
| Energy per mile | 8.7 Wh |
| Charger output | 2.3 A |
| Power to weight | 8.9 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.
Seventy five miles, and hydraulic brakes, at eight hundred and ninety nine pounds
The Onesport OT05 claims 75 miles, longer than eighty five per cent of our catalogue, on 27.5 inch wheels with hydraulic brakes, at £899.
Road legal at 250W: no licence, no tax, no insurance, nothing to register.
Where the range comes from
Eighteen point two amp hours at 36 volts, which is about 655 watt hours, on 27.5 inch wheels.
A large wheel with a moderate tyre is the efficient combination. The bike is not spending its battery carrying itself the way a fat tyre machine does, and that is the whole reason a 36 volt system can make a claim like this.
The panel below turns the capacity into energy per mile and gives you eco, mixed and full assist bands. The mixed one is what to plan around.
Hydraulic brakes at this price
Hydraulic discs rather than cables, which most bikes under nine hundred pounds do not fit.
One finger is enough, they do not fade on a long descent, they hold their bite in the wet, and they need no adjustment as the pads wear.
Twenty seven point five inch wheels
Between a road wheel and a mountain wheel, and the size most modern trail bikes settled on.
- Rolls over ruts and roots rather than climbing them
- Holds speed once you have it
- Quicker to turn than a 29 inch wheel
- A common size, so tyres are on any shelf
Sixty two pounds of aluminium
An aluminium alloy frame at sixty two pounds, lighter than nearly sixty per cent of our range.
Aluminium does not rust, which matters on a bike that lives outside, and sixty two pounds is the boundary between a bike you can lift onto a rack and one you cannot.
Eight to ten hours on charge
Long, because the charger is a modest one for the capacity. Treat it as an overnight bike rather than one you top up between errands.
Charging little and often rather than running it flat is what keeps a pack healthy past its second winter.
Before the first ride
It arrives largely built.
- Fit the front wheel, handlebar and pedals
- Bed the hydraulic brakes in at walking pace before a first descent
- Set the saddle to hip height
- Check tyre pressure on both 27.5 inch wheels
- Charge to full once before the first long ride
What the sheet does not say
There is no torque figure for this motor, so the table below leaves that row out rather than inventing one. Torque is what you feel on a hill start, and without a number we will not imply one.
This is also one of the older listings in our catalogue, from before our current supplier, so the specification here is shorter than the ones beside it. Everything in the table is stated; nothing has been filled in.
The payload is the limit
Two hundred and sixty five pounds, lower than ninety six per cent of our catalogue.
That is rider plus everything on the bike. A fourteen stone rider with a loaded rucksack is close to it. If you are heavier, or you carry a lot, we list bikes rated to 330 and 350 pounds and will point you at one.
Who it is for
Roads, cycle paths, canal towpaths and gravel tracks, over long distances, carrying yourself and a bag.
Buy it if the range figure and the hydraulic brakes are what you are shopping for and you do not need a specification sheet with forty rows on it. For eight hundred and ninety nine pounds those two things together are hard to find.
- BRAND
- Onesport
- CATEGORY
- City
- MOTOR POWER
- 250W
- RANGE
- 75 Miles
- SPEED
- 15.5 Mph
- BATTERY
- 18.2Ah
- WEIGHT
- 62 lbs
- CHARGING TIME
- 8-10 Hours
- BRAKE SYSTEM
- Hydraulic Disc
- FRAME MATERIAL
- Aluminium Alloy
- MAXIMUM LOAD
- 265 lbs
- INPUT VOLTAGE
- 36V
- TIRE SIZE
- 27.5 inch
- TORQUE
- N/A
The ONESPORT OT05 Electric Mountain Bike states 250W, 75 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.
8 of 11 specifications differ. View DYU A1F Electric Folding Bike
- 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.
Write a Review
Share your experience and help other customers make the right choice.
Other Bikes You Might Like
Browse alternative electric bikes suited to a similar riding style or price range. A useful way to compare options before you decide.
More From This Brand
Explore more electric bikes from the same brand, selected for similar quality, performance, and everyday value.
Helpful reading
Guides and reviews to help you decide.
ReviewAAIRSK XT90 Review, 750W Off Road E-Bike for Private Land
In this detailed AAIRSK XT90 review, we compare the 750W off-road e-bike, explain range, power and UK law, and help you decide if it suits private land riding.
Read guide →
ReviewAAIRSK GT300 Review, Is the Cheapest AAIRSK Good Enough?
Honest AAIRSK GT300 review for UK buyers. We look at what the £499 electric mountain bike gets right, where it cuts corners, and who should buy it.
Read guide →
ReviewAAIRSK X5 Review, 20 Inch Fat Tyre Electric Bike UK
The AAIRSK X5 is a chunky 20 inch fat tyre electric bike costing £649. Here is our take on comfort, range and build quality based on its published specifications.
Read guide →
Not sure which electric bike is right for you?
Answer a few quick questions and we will help point you towards the bikes that best match your riding style, budget and daily needs. Fast, free, no commitment.
Start the Bike QuizGet £30 Off Your First Order
Sign up to the BikTron newsletter and receive £30 off your first purchase. Be the first to hear about new bikes, special deals, and practical electric bike tips — no spam, just useful updates.
New subscribers only. Discount applied at checkout.
