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Humber Flex+ Utility Electric Bike 250w

£1,799.00
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The Humber Flex+ is a high-performance electric utility bike designed to master the diverse demands of UK urban life, from heavy-duty shopping trips to safe family transport. Engineered for maximum stability, this model features ultra-wide 4-inch tyres and a robust aluminium frame with a low-step "drop" design, making it exceptionally easy to mount and dismount even when fully loaded. Whether you are navigating city cobblestones or gravel paths, the Flex+ delivers a smooth, stable roll that combines rugged eMTB durability with sophisticated urban style.

At the heart of the Flex+ is a powerful Promovec rear hub motor delivering 55 Nm of torque, specifically developed to withstand the harshest climates and terrains. This reliable system is paired with a high-capacity Long Range 720 Wh battery, discreetly mounted on the seat tube for an optimal centre of gravity and effortless charging. Equipped with a Shimano Altus 8-speed drivetrain and Shimano hydraulic disc brakes with 180mm rotors, the bike ensures precision gearing and superior stopping power for a safe, UK road legal riding experience.

Practicality is redefined through the integrated Atran Velo System (AVS), featuring flexible luggage carriers on both the front and rear that support up to 10kg and 27kg respectively. The bike is a "ready-to-go" solution for modern commuters, arriving with a double-sided kickstand for secure parking, integrated Herrmans LED lighting, and a Bluetooth-enabled graphic display that connects to the Promovec e-connect app. With an industry-leading 5-year battery warranty and 10-year frame guarantee, the Humber Flex+ represents a premier investment in sustainable, versatile transport.

 

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

 

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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

 

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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

Promovec 55 Nm High-Torque Rear Motor

The Flex+ is powered by a high-performance 250W Promovec motor that provides 55 Nm of torque, delivering a natural and smooth assistance level that makes hills feel flat. Backed by a 3-year warranty, this motor is specifically tested for durability in challenging terrains, ensuring long-term reliability for the daily UK commuter. The system includes a built-in walk-assist function, which is invaluable when you need to pull a fully loaded bike up a steep incline or ramp. This torque-heavy setup ensures that even with a combined rider and cargo weight, the bike maintains a responsive and agile feel in traffic.

Dual Atran Velo System (AVS) Cargo Racks

The Flex+ features a highly flexible cargo setup with AVS luggage carriers at both the front and rear. The front rack handles up to 10kg, while the rear rack supports up to 27kg, allowing for the easy click-on installation of child seats, baskets, and pannier bags. This modular design transforms the bike from a sleek urban commuter into a heavy-duty family transport vehicle in seconds. It provides the ultimate flexibility for the modern user who needs a bike that can adapt to different tasks throughout the day.

Stable 4-Inch Fat Tyres & Hydraulic Braking

The signature 4-inch wide VEE Tire Speedster tyres provide a stable and smooth roll over diverse surfaces like cobblestones and gravel. This "fat tyre" setup acts as natural suspension, soaking up road shocks while providing a massive contact patch for superior grip in wet UK conditions. To manage the momentum of a loaded utility bike, the Flex+ is fitted with Shimano MT200 hydraulic disc brakes with large 180mm rotors. These provide powerful, consistent stopping performance with minimal hand effort, ensuring safety regardless of the weather or load weight.

specifications

Battery and Range
Promovec DT7-XL **Battery Placement : On seat tube **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 rear hub motor 250W
Torque
55 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 Altus 8 speed
Cable Routing
Semi-integrated cable routing
Stem
Fixed 60 mm
Front Brake
Hydraulic disc brake Shimano MT200, 180 mm rotor
Rear Brake
Hydraulic disc brake Shimano MT200, 180 mm rotor
Saddle
DDK Comfort saddle
Tyres
VEE Tire Speedster 20 x 3.0"
Mudguards
Yes
Frame
Aluminum
Front Light
Herrmans fixed headlight
Rear Light
Herrmans fixed rear light
Equipment
Ergonomic handles, flexible Atran Velo System (AVS) front and rear offer many options for extras and accessories
Rear Rack
Atran Velo System front (AVS) and rear (AVS+)
Kickstand
Yes, double support legs
Basket
Optional
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.
Commuter Electric Bikes

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