Humber Dynamic Cargo 3 Mid-Drive Electric Bike 250w

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The Humber Dynamic Cargo 3 Mid-Drive is a premier electric cargo trike that combines Danish engineering with top-class functional design to offer the ultimate family transport solution. Specifically built to handle the most demanding urban environments, this model features a powerful Danish-made mid-drive motor that delivers a natural and intuitive riding experience. As a high-performance UK road legal vehicle, the Dynamic Cargo 3 Mid-Drive provides the stability of a three-wheeled platform with the sophisticated power delivery required to carry passengers and cargo over hilly terrain with total confidence.

At the core of its performance is the Promovec Silent Drive center motor, which provides a massive 80 Nm of torque directly to the pedals, ensuring a smooth and responsive boost that scales with your effort. This is complemented by the advanced Rapid Clutch Assist technology, allowing for effortless starts from a complete standstill, even when the cabin is at maximum capacity. Paired with a centrally integrated Long Range 691 Wh battery, this trike offers a reliable and extensive range for the daily school run, weekly shopping, and family weekend adventures, all while maintaining a perfectly balanced centre of gravity.

Designed for the safety and comfort of up to four children, the Dynamic Cargo 3 features a Danish-made cabin with soft neoprene seats, 3-point harnesses, and integrated USB charging. The bike arrives "ready-to-go" with a full all-weather canopy, Shimano Nexus 5-speed internal gearing, and powerful Bengal Ares hydraulic disc brakes. With an industry-leading 5-year battery warranty and 10-year frame guarantee, the Humber Dynamic Cargo 3 Mid-Drive is a robust, future-proof investment for any modern family looking to embrace a more sustainable lifestyle.

 

How is the frame size measured?

Most E-bikes are measured from the centre of the crank to the base of the seat post tube. However, some E-bike manufacturers may measure their bikes differently depending on their style. 

What is the right frame size for me?

This helpful guide will help you to find which size electric bike is best suited to you. If you would like a bit more information, don't hesitate to get in touch.

 

 

HYBRID ELECTRIC BIKES

MENS

Rider Height Recommended Hybrid Frame Size
Feet & Inches Centimetres Frame Size (inches) Frame Size (cm) Frame Size
4'10" - 5'2" 148cm - 158cm 13" - 15" 33 - 39 X-Small
5'2"" - 5'6"" 158cm - 168cm 15"-16" 38 - 44 Small
5'6" - 5' 10" 168cm - 178cm 17" - 18" 43 - 47 Medium
5'10" - 6'1" 178cm - 185cm 19" - 20" 48 - 52 Large
6'1" - 6'4" 185cm - 193cm 21" - 22" 53 - 57 X-Large
6'4" - 6'6" 193cm - 198cm 23" - 24" 58 - 61 XX-Large

 

WOMENS

Rider Height Recommended Women's Hybrid Frame Size
Feet & Inches Centimetres Frame Size (inches) Frame Size
4'10" - 5'2" 148cm - 158cm 13" - 14" X-Small
5'2"" - 5'6"" 158cm - 168cm 15" - 16" Small
5'6" - 5' 10" 168cm - 178cm 17" - 18" Medium
5'10" - 6'1" 178cm - 185cm 19"+ Large

 

VIEW ALL HYBRID E-BIKES

ELECTRIC MOUNTAIN BIKES

MENS 

Rider Height Recommended Mountain Frame Size
Feet & Inches Centimetres Frame Size (inches) Frame Size (cm) Frame Size
4'10" - 5'2" 148cm - 158cm 13" - 14" 33 - 37 X-Small
5'2"" - 5'6"" 158cm - 168cm 15" - 16" 38 - 42 Small
5'6" - 5' 10" 168cm - 178cm 17" - 18" 43 - 47 Medium
5'10" - 6'1" 178cm - 185cm 19" - 20" 48 - 52 Large
6'1" - 6'4" 185cm - 193cm 21" - 22" 53 - 57 X-Large
6'4" - 6'6" 193cm - 198cm 23" - 24" 58 - 61 XX-Large

 

WOMENS

Rider Height Recommended Women's Mountain Frame Size
Feet & Inches Centimetres Frame Size (inches) Frame Size
4'10" - 5'2" 148cm - 158cm 13" - 14" X-Small
5'2" - 5'6" 158cm - 168cm 15" - 16" Small
5'6" - 5' 10" 168cm - 178cm 17" - 18" Medium
5'10" - 6'1" 178cm - 185cm 19"+ Large

 

VIEW ALL EMTB's

COMMUTER ELECTRIC BIKES

MENS

Rider Height Suggested Commuter Bike Size
Feet & Inches Centimetres Frame Size (cm) Frame Size
4'10" - 5'0" 148cm - 152cm 47cm - 48cm XX-Small
5'0" - 5'3" 152cm - 160cm 49cm - 50cm X-Small
5'3" - 5'6" 160cm - 168cm 51cm - 53cm Small
5'6" - 5'9" 168cm - 175cm 54cm - 55cm Medium
5'9" - 6'0" 175cm - 183cm 56cm - 58cm Large
6'0" - 6'3" 183cm - 191cm 58cm - 60cm X-Large
6'3" - 6'6" 191cm - 198cm 61cm - 63cm XX-Large

 

WOMENS

Rider Height Suggested Women's Commuter Frame Size
Feet & Inches Centimetres Frame Size (cm) Frame Size
4'10" - 5'1" 147cm - 155cm 44cm - 46cm XX-Small
5'1" - 5'3" 155cm - 160cm 47cm - 49cm X-Small
5'3" - 5'5" 160cm - 165cm 50cm - 52cm Small
5'5" - 5'8" 165cm - 172cm 53cm - 55cm Medium
5'8" - 5'10" 172cm - 180cm 56cm - 57cm Large

 

VIEW ALL COMMUTER ELECTRIC BIKES

Danish-Made 80 Nm Silent Drive Mid-Motor

The Dynamic Cargo 3 is powered by the elite Promovec DK Silent Drive center motor, providing a professional-grade 80 Nm of torque. Unlike hub motors, this mid-drive system transfers power directly through the pedals, resulting in a more natural and intuitive boost that is particularly effective for climbing steep hills or accelerating with a full cabin. Backed by a 3-year warranty, this motor represents the pinnacle of Danish e-bike engineering, ensuring silent and reliable performance for years of daily use.

Smart Tech & USB Charging in the Cabin

This modern e-trike features integrated USB charging ports within the cabin, allowing children to keep tablets or handheld games powered during transit—a game-changer for longer commutes or family days out. The rider stays informed via a Graphic Slim display that connects via Bluetooth to the Promovec e-connect app. This smart integration allows for personalized assist levels, route tracking, and real-time battery diagnostics, turning the trike into a fully connected digital vehicle.

ISOFIX Compatibility & 4-Child Seating

The Dynamic Cargo 3 is one of the most versatile family freighters available, offering the ability to transport up to four children with the installation of an optional second bench. For parents of infants, the cabin is designed to accommodate ISOFIX brackets, allowing you to click a standard car seat directly and securely into the bike. This adaptability makes the trike a long-term solution that evolves alongside your family, from baby transport to the primary school run and beyond.

specifications

Battery and Range
Danish-made Promovec Carrier 7-XL
**Battery Placement : Integrated under the front bed
**Fixed Battery : Yes
**Range according to battery capacity. It is also dependent on the different riding conditions - terrain, rider weight, tyre pressure, headwind etc.
Motor
Promovec DK mid-drive motor Silent Drive
Torque
80 Nm
Maximum Speed
25 km/h
Display
Promovec Graphic Slim D700+
E-connect App : Display can be connected to app for a more personalized driving experience
Walk Assist
Yes
Gears
Shimano Nexus 5 speed
Cable Routing
Semi-integrated cable routing
Stem
Fixed 40 mm
Brake
Hydraulic disc brake Bengal Ares 8 2.3. mm, rotor 180 mm (Front & Rear)
Saddle
Selle Royal Lookin saddle
Tyres
Rubena Donkey
Lights
Front: Spanninga Brio XE
Rear: Spanninga Pixeo XE LED
Frame
Aluminum
Equipment
Includes canopy, ergonomic handles, 3-point harness with chest buckle for increased safety, neoprene seat padding, USB charging in the cabin, parking brake, Rapid Clutch Assist for ultra-easy starting, Danish-made front box, fenders
Child Seat Compatibility: Yes (also car seat via ISOFIX)
Delivery
2-5 working day delivery time on all orders.
Returns
Cancelling your order: If you would like to cancel your order, please contact us immediately at info@ecobikecompany.com or on 0333 050 3189. Please include your order number when contacting us. If your order has not yet left the manufacturer's warehouse, we should be able to stop it shipping, and issue you a refund immediately. Please note –  when returning a product, it must be returned in ‘as new’ condition, with all components included, in their original packaging. There will be a charge for the return. Returns - Changed your mind If you change your mind after buying from us and want a refund, you have up to 14 days to let us know and have the goods returned to us. You will need to return the product to us before we can provide a refund. Eco Bike Co. can help arrange the return for a charge of £50 - a courier will be sent to pick it up from you & return it to the manufacturer.   Please note –  the 14 days return period is to allow you to examine the goods as you would in a shop. To obtain a full refund, the goods must be returned in an “as new” condition with all components included in their original packaging. “As new” condition is defined as unridden. Returns - Damages & Faulty We ask that you thoroughly inspect all items at the point of delivery. We advise you not to accept delivery of any damaged items. If you discover that an item has been damaged, please send clear photos of the damaged items to info@ecobikecompany.com so that we can open an insurance claim on your behalf. If your bike develops a fault through normal use (as outlined in the manufacturer's manual) you could be entitled to a repair or replacement as covered with the warranty. Please send through details of the fault to info@ecobikecompany.com and we will arrange the repair or replacement with the manufacturer. Please note –  any fault caused due to misuse of the bike is not covered by this policy. Please ensure you read the manufacturer's manual in detail before using your electric bike to avoid voiding your warranty.

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