Price from
4.500,00 €
VAT included
Cargo bike listing.

Price from
4.500,00 €
VAT included
Cargo bike listing.
Configuration total
€4,500.00
This page brings together the available information to compare this product, check its configuration and prepare your order.
Happy Cargo Bike option
This bike is sold without a motor or battery. We can fit it with an electric kit tailored to you: you choose the motor power and battery capacity according to your use. Feasibility confirmed depending on the model.
Motor power
Up to 250 W: an electrically assisted bicycle under European law, with assistance up to 25 km/h.
Above 250 W, the bike is no longer an electrically assisted bicycle under the law: its use is the customer’s sole responsibility.
Battery capacity (Wh = volts × amp-hours)
| Voltage | 11 Ah | 13 Ah | 16 Ah | 17 Ah | 19 Ah | 20 Ah |
|---|---|---|---|---|---|---|
| 36 V | 396 Wh | 468 Wh | 576 Wh | 612 Wh | 684 Wh | 720 Wh |
| 48 V | 528 Wh | 624 Wh | 768 Wh | 816 Wh | 912 Wh | 960 Wh |
The higher the capacity, the further you ride between charges.
Bike ready to be electrified — let’s work it out together
You have this bike, ready to receive its motor. Once electrified: assisted speed limited to 25 km/h (that is the law, for everyone), approved 250 W motor — and it is the torque, in newton-metres, that makes the real difference when setting off and on hills. Lots of children on board? A load? Answer three questions.
1 · Who do you carry?
2 · Your terrain?
3 · Your trips?
Our recommendation
250 W motor · aim for 60 to 70 Nm · battery 48 V 17 Ah (≈ 816 Wh)
Our kits range from 125 to 500 W: above 250 W, use is restricted to private land, at your own responsibility — we will tell you frankly if your needs justify it.
What do I need for my daily use?
Tell us about your use: the motor and battery you need take shape. The higher the gauges climb towards red, the more strength and range your use requires.
Route terrain
Motor · strength
≈ 80 Nm
recommended torque
Battery · reserve
≈ 275 Wh
recommended capacity
Indicative estimate, with a 30% reserve so you do not finish the day with a flat battery and to allow for the cold. Describe your route to us: we will confirm the right choice.
The battery = the tank
Its capacity is measured in watt-hours (Wh): voltage (V) multiplied by amp-hours (Ah). More Wh means more kilometres between charges, but neither more speed nor more power.
The motor = the strength
What matters is torque, in newton-metres (Nm): it makes the difference when setting off, on hills and with children or a load. For an electrically assisted bicycle, European law limits power to 250 W and cuts assistance at 25 km/h: maximum assisted speed is therefore the same for all; a higher-torque motor reaches it more easily, even when loaded.
Range = your use
With the same battery, range varies a lot depending on the assistance level chosen (from Eco to Turbo), hills, the weight carried, average speed, wind, tyre pressure and cold weather, which reduces capacity.
The right motor and battery depend on your route (hills, distance, load, passengers): we choose them together when you send us your request.
Write us two lines: we answer personally, from our Barcelona workshop.
info@happycargobike.com

The Boxter CL carries the whole family, with an impressive 150 kg load capacity in the box. The quality choice for life's small and big adventures.
Price from
7.499,00 €

The Cargo BIG offers an extended 107 cm-long load platform: much more room for large boxes, bulky plants… or children sitting with their legs stretched out. In practice, one trip in four becomes unnecessary.
Price from
6.149,00 €

The Cargo is fitted with a Brose motor — among the most powerful on the market with 90 Nm of torque, where many top out at 50 or 70 Nm — and, on top of that, completely silent.
Price from
6.249,00 €

The Boxter Air II is designed and developed in Denmark to offer an exceptional combination of aesthetics, safety and ride quality. An ecological alternative to the family car, with an anti-tip design that guarantees stability and peace of mind.
Price from
4.999,00 €

The Boxter Air III is designed and developed in Denmark to offer an exceptional combination of aesthetics, safety and ride quality. An ecological alternative to the family car, with an anti-tip design that guarantees stability and peace of mind.
Price from
4.999,00 €

The Hafnia is a cargo trike designed in Copenhagen, combining functionality and style to offer a practical, safe alternative to the family car. Up to four children on board: the ally of families who want sustainable mobility in the city.
Price from
3.799,00 €