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TrailSurge workshop service
Professionally Assembled & Hand Delivered
Our workshop team will build, set up and inspect your electric bike before it leaves us. It arrives fully assembled, with the final setup handled for you.
Everything included
Professional assembly
Manufacturer assembly completed
Handlebars, display and controls aligned
Front wheel, pedals, mudguards and rack fitted where supplied
Saddle and seatpost correctly fitted and secured
Key fasteners checked and secured
Mechanical & electrical checks
Brakes inspected, aligned and adjusted
Gears indexed and drivetrain checked
Chain, cranks and pedals checked
Tyre pressures and wheel security checked
Battery, charger, display and pedal-assist system tested
Final preparation & delivery
Final pre-delivery safety inspection
Supplied lights and controls tested
Protective packaging removed and bike cleaned
Fully assembled hand delivery to your address
No final assembly required at home
Delivery takes 5–7 working daysPlease allow 5–7 working days for your fully assembled bike to arrive with you. This includes the time needed for our workshop team to assemble, inspect and prepare it before delivery.
Battery charge levels can vary on arrival. Fully charge the bike and follow the manufacturer’s safety guidance before first use.
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3–5 working days
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Collect from our Nuneaton workshop
Collection is available by appointment from our Nuneaton workshop. The preparation time depends on where the product is currently stored. Contact us before ordering for the latest availability, or place your order and we will confirm when it is ready to collect.
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Products stored at another warehouse normally require 5–7 working days to reach our workshop. We will confirm as soon as the item is ready and arrange your collection appointment.
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Checking: DYU D3F Mini Electric Bike
Why Buy From TrailSurge?UK showroom, product support & aftercare
Buy your DYU D3F Mini Electric Bike with UK-based support
TrailSurge is a UK retailer with a showroom and workshop in Nuneaton. Our team can help before you order and continue supporting you after your DYU D3F Mini Electric Bike arrives.
UK-based customer support before and after your purchase
Showroom and workshop in Nuneaton
Help with product questions, setup, parts and aftercare
Tracked UK delivery with support if you need help with your order
Speak to a real member of our team before placing your order
Why buy through TrailSurge?For the best UK-based support and aftercare, we recommend buying through TrailSurge rather than ordering directly from overseas manufacturers or China-based sellers, where returns, warranty support and parts handling can be more difficult.
Need help with the DYU D3F Mini Electric Bike?Ask our team a question before ordering.
Good to knowCompact 14 in mini e-bike frame. Contact us with your height and inside leg for a fit check.
Trail Surge Warranty Plus
FULL OFFICIAL WARRANTY INCLUDED
UK-based support alongside the manufacturer warranty
TRAILSURGE COVER
12 months
TWO LAYERS OF PROTECTION
More confidence after you buy
TrailSurge Warranty+ gives you a direct UK warranty alongside the product’s manufacturer warranty.
01TRAILSURGE WARRANTY +
12 monthsof TrailSurge support
UK-based fault support
Battery, motor and frame fully covered.
Repair, parts or another suitable solution where eligible
+02DYU WARRANTY
Manufacturer warranty period12 months for the original owner on the frame, battery and factory-fitted components.
Manufacturer cover
Manufacturing defects and confirmed transit damage. Eligible frame faults may qualify for a replacement frame, while batteries may be repaired or replaced following assessment.
Typical component protection
Eligible faults affecting the frame and forks, motor and drive system, controller, battery and BMS, charger, wiring, display, gears, brakes and factory-fitted controls.
Description
Zip Through the City The D3F’s quiet 250 W motor delivers smooth acceleration the moment you twist the throttle or tap into one of three pedal‑assist levels. Perfect for quick errands or weaving through traffic, it feels almost like riding on air.
Pocket‑Sized Power Despite its petite 14″ wheels and minimalist frame, the D3F hides a 36 V 7.8 Ah battery that slides out for charging in under 4 hours. On a full charge, you’ll cover up to 40 km in pure electric mode—or stretch that to 60 km when you add a little pedal power.
Comfort in a Small Package Rugged puncture‑resistant tires and a spring‑loaded saddle soak up bumps you’d never expect to feel on such a tiny bike. Your joints—and your morning coffee—thank you when you sail over cracks, cobblestones, or speed bumps without a jolt.
Folds in a Flash One quick release on the stem and frame hinge collapses the D3F into a footprint small enough for bus racks, train floors, and office nooks. At just 18 kg, it’s light enough to carry upstairs or stash under your desk.
Safety You Can Count On Front and rear LEDs keep you visible at dusk, while mechanical disc brakes deliver confident stopping power in rain or shine. Reflective accents around the frame give you that extra edge in low‑light conditions.
Whisper‑Quiet Burst of Power from a 250 W Brushless Motor
Feel the surge of smooth, efficient acceleration as the DYU D3f’s advanced 250 W hub motor delivers instant torque—hitting a regulated 25 km/h top speed without rattling your ride. Sealed for durability and tuned for maximum range, it’ll carry you up hills and through traffic with effortless confidence.
Lightning‑Fast Stopping with Front & Rear Dual Disc Brakes
Ride with total peace of mind thanks to precision‑engineered disc rotors on both wheels. High‑sensitivity calipers bite instantly in all weather conditions, giving you razor‑sharp modulation and the shortest stopping distances—perfect for urban commutes and crowded streets.
Everything You Need—Integrated Smart Components for Ultimate Convenience
From the bright LED headlight and spring‑loaded comfort saddle to the tactile bell and easy‑reach throttle, the D3f packs essential features seamlessly into its compact chassis. A built‑in rear fender keeps you dry, while the discreet carry handle doubles as a battery hatch for grab‑and‑go recharging.
What’s Included in the Box?
1 x DYU D3F Mini Electric Bike
1 x Charger
2 x Keys
1 x Tool Kit
1 x User Manual
Assembly Information
Assembly Video
Watch the assembly guide below before first setup.
Yes if compact size matters more than maximum comfort. The 14-inch D3F is about 19kg and folds narrow for storage, making it one of DYU's easier full-size e-bikes to live with in a small space.
The D3F is better described as compact or semi-folding than suitcase-small. DYU lists a folded size of about 117 × 20 × 72cm, so the bike becomes much narrower but keeps most of its original length.
That works well for a car boot, hallway, office or camper, but it is not a tiny package you would want to carry around a station for long periods.
DYU's current comparison information lists no phone app for the D3F. It is intentionally simple, although the current UK model does include a cruise function for steady-speed riding.
DYU's current UK specification lists up to around 50km in pedal-assist use and around 40km using throttle mode. Those are maximum test figures, not a guaranteed everyday distance.
Rider weight, cold weather, hills, stop-start riding and higher assistance all reduce range, so leave a useful reserve rather than planning a journey around the final kilometre of the claim.
The DYU D3F Mini Electric Bike arrives mostly assembled. Final setup normally includes aligning and securing the handlebars, fitting the pedals and completing essential safety checks. Allow approximately 20–30 minutes, or select our professional assembly and PDI service.
The DYU D3F Mini Electric Bike is not fully waterproof. Avoid prolonged exposure to heavy rain, and never submerge or pressure wash the bike or its electrical components. After riding in wet conditions, wipe the bike dry and store it in a dry, sheltered location.