Humber Flex Electric Fat Tyre Cargo Bike 250W

The Humber Flex is a compact, low-entry electric bike designed for riders who want one bike that does it all. Whether you're commuting through traffic, picking up groceries or heading out for a weekend adventure, the drop-frame design makes mounting and dismounting easy, and the wide handlebars give you confident control in tight city streets. With 20" VEE Tire Speedster 3.0" tyres, you get a stable, cushioned ride across kerbs, cobbles and country lanes alike.

At the heart of the Flex is a 250W Promovec rear hub motor delivering 55 Nm of torque and assistance up to 25 km/h - enough to flatten hills and shrug off heavy loads without feeling sluggish. You can choose between the Boost 540 Wh battery for everyday range or the Long Range 720 Wh option for longer trips, both mounted on the seat tube and covered by a 5-year warranty. The intuitive Promovec Graphic Slim D700+ display offers 5 assist levels, a built-in walk-assist function and Bluetooth pairing with the Promovec e-connect app for a more personalised ride.

What sets the Flex apart is its everyday practicality. The Atran Velo System (AVS) carriers on the front and rear let you fit baskets, panniers, child seats or transport boxes - up to 10kg on the front and 27kg on the rear - so the bike adapts as your needs change. A double kickstand keeps everything upright and stable when you're loading up, and integrated Herrmans front and rear lights mean you're road-ready in any conditions.

Built around a durable aluminium frame with a 10-year warranty, the Flex is finished with reliable Shimano Altus 8-speed gearing, hydraulic Shimano MT200 disc brakes with 180 mm rotors, mudguards and a comfortable DDK saddle. Designed and tested for Nordic conditions and backed by 25 years of Promovec engineering experience, it's a robust, family-friendly e-bike supported by a wide network of local dealers and workshops. Available in Bone or Midnight Forest.

Please note the battery on this model is fixed.

Maximum Assisted Speed: 15.5mph / 25km/h
Motor: Promovec rear hub motor, 36V 250W, 55Nm torque
Motor Type: Rear hub motor
Motor Power: 250W
Motor Torque: 55Nm
Battery: Promovec DT7-XL, available in Boost 540Wh (max range between 50 to 80 km) or Long Range 720Wh (max range between 80 and 125 km), mounted on the seat tube, fixed (not removable)
Battery Type: Fixed, frame-mounted
Battery Warranty: 5 years
Display: Promovec Graphic Slim D700+, 5 assist levels, walk-assist function, Bluetooth connectivity to Promovec e-connect app
Walk Assist: Yes
Frame: Aluminium, low step-through (drop) design, semi-integrated cable routing
Frame Size: 44cm (~17")
Frame Warranty: 10 years
Stem: Fixed, 60mm
Handlebar: Wide, ergonomic
Grips: Ergonomic
Gear Shifters: Shimano Altus, 8 speed
Number of Gears: 8
Brakes: Shimano MT200 hydraulic disc, 180mm rotor (front and rear)
Brake Levers: Shimano MT200 hydraulic disc
Tyres: VEE Tire Speedster, 20 x 3.0"
Mudguards: Yes
Saddle: DDK Comfort
Front Light: Herrmans fixed headlight
Rear Light: Herrmans fixed rear light
Front Rack: Atran Velo System (AVS), up to 10kg load capacity
Rear Rack: Atran Velo System (AVS+), up to 27kg load capacity
Kickstand: Yes, double support legs
Basket: Optional accessory
Colours: Bone, Midnight Forest
Equipment: Ergonomic handles, flexible Atran Velo System (AVS) front and rear for baskets
Not Yet Included: Child seats, panniers and other accessories

Bike weight incl. 20 Ah battery: 29.5 kg
Maximum user weight: 100 kg
Maximum load, front rack: 10 kg
Maximum load, rear rack: 25 kg
Total maximum weight: 164.5 kg

Humber electric cargo bikes are delivered fully assembled with complementary white-glove service. This includes a personalised handover with your fully built unboxed bike ready to ride.

Delivery is typically within 3-6 working days from your order date.

Please Note: There may be a small shipping surcharge for remote areas. If relevant, you will be contacted after your order.

Suitable for most UK adults. The frame is 44cm / 17".

Dimensions

• Height: 107 cm
• Length: 181 cm
• Width: 75 cm

With Humber Bicycles you get the following guarantees:

• 5-year warranty on battery*
• 3 year warranty on motor
• 10 year warranty on frame

*If the battery is registered on promovec.dk

Buyline Finance - 0% APR Over Up To 11 Months

With Buyline Finance, you can spread the cost of your new wheels across up to 11 monthly payments with 0% APR. Simply choose between 6, 9, 10, or 11 month payment plans and select the deposit you wish to pay (between 0-50%).

For further information or to order with Buyline, check out our dedicated finance page here (not through checkout on our website).

Other Ways To Pay

We also accept:

• All Major Credit/Debit Cards (inc. Amex)
• PayPal
• Klarna
• Bank Transfer

The UK Cycle to Work Scheme is a government initiative (salary sacrifice) aimed at promoting healthier lifestyles and reducing environmental impact.

It allows employees to save money and commute with a new bike and accessories, spreading the cost over tax-free monthly instalments through your employer, potentially saving you up to 42% of the cost. It's a brilliant way to get an e-bike without breaking the bank!

To find out more, order through the scheme, or ask any questions, check out our dedicated Cycle to Work page.