Humber Flex LT Cargo Electric Bike 250w

£2,349.00
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The Humber Flex LT is a robust and versatile electric bike designed to transform everyday travel. Its extended longtail frame offers generous cargo space, making it ideal for grocery runs, school drop-offs, or carrying kids and gear. Despite its size, the low step-through frame and well-balanced geometry make it easy to handle—even when fully loaded.

Powered by a Promovec rear hub motor delivering 60 Nm of pedal assist, the Flex LT provides smooth, reliable performance whether you're riding solo or hauling heavy loads. The centrally mounted battery enhances balance and offers ample range for both daily commutes and longer leisure rides.

Flexibility is at the heart of the Flex LT. With AVS+ racks at the front and rear, you can easily attach child seats, panniers, cargo boxes, or accessories like a double seat and safety bar. A dual kickstand with Smart Lift function ensures excellent stability when parked, even with passengers on board.

The bike features a Promovec D700+ display with five assist levels and walk assist, and connects via Bluetooth to the e-connect app for added control and ride insights. Wide 3” tires provide a smooth, stable ride across different surfaces, while powerful hydraulic brakes and integrated Herrmans lighting ensure safety in all conditions.

Make daily life simpler—and more enjoyable—with a bike that carries it all.

 

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

High-Torque 60 Nm Promovec Motor

Driven by a 250W Promovec rear hub motor, the Flex LT delivers 60 Nm of torque to ensure smooth and stable assistance when carrying heavy luggage. This motor is backed by a 3-year warranty and is specifically developed to withstand the demands of the Nordic climate, ensuring year-round reliability in the UK. The system includes a built-in walk-assist function, which is an essential feature for safely manoeuvring a loaded cargo bike up ramps or hills. This high-performance motor ensures that even the most challenging gradients feel effortless, regardless of your payload.

Extended Longtail Frame with 54kg Rear Capacity

The Flex LT features an optimized longtail design that provides a massive 54kg weight capacity on the rear rack alone. This extended platform allows for the installation of two child seats, a double seat, or large panniers, making it one of the most capable family e-bikes on the market. Despite its increased length, the frame's low-entry design makes it easy to mount and dismount, providing a balanced and manageable ride even when fully loaded. This design is perfect for busy parents or couriers who need a stable and reliable freighter for the "last mile" of their journey.

Enhanced Hydraulic Braking with 200mm Rear Rotor

To ensure maximum safety when carrying passengers, the Flex LT is equipped with Shimano MT200 hydraulic disc brakes. The rear brake features an oversized 200mm rotor, specifically chosen to provide superior stopping power and heat dissipation when the bike is at its maximum weight capacity. This premium braking setup offers consistent, one-finger modulation in all weather conditions, which is crucial for navigating heavy UK traffic with children on board. It ensures that you have total control over the bike’s momentum at all times.

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
60 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, 200 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 lots of extras and accessories.
Rear Rack
Atran Velo System front - AVS+ front and 2 x AVS+ rear
Child Seat Compatible
Yes, possibility for two high chairs
Kickstand
Yes, double support legs with Smart Lift
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.

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