Generally speaking, the more complicated something is to design or manufacture, the more expensive it is. The more functionality it provides, the more expensive it is. And the more compact or refined it is, the more expensive it is.

So how on earth can iScooter make a UK road legal folding electric bike – with disc brakes, front suspension and a battery with up to 90km of range – for its current offer price of less than £450?

The answer, at least to some extent, is knowledge and experience. When it comes to electric-powered personal transportation, iScooter has been at the forefront for almost a decade. It started with children’s electric scooters in 2017, e-bikes in 2023, and, most recently, electric dirt bikes in 2026.

iScooter U4 lifestyle
The iScooter U4 is your perfect city cycling companion. (Image credit: iScooter)

The brand currently boasts more than 2 million owners, with 130 million miles covered on its products – in the process, helping to reduced 49 million kilograms of carbon dioxide emissions.

But while the environmental benefits are obviously important, make no mistake about it, the benefits to iScooter’s owners – personal mobility, easy commuting, simple and inexpensive transport, compact storage and, yes, glorious riding fun – are arguably even greater.

So let’s look at the iScooter product that possibly maximises all those benefits more than any other: the U4 low step-through foldable electric bike.

iScooter U4 e-bike £438.99

iScooter U4 choice of colours
The U4’s range of talents are all there in black and white. (Image credit: iScooter)

Nothing says practical personal transport better than a folding bike. And nothing says civilised practical personal transport better than a folding e-bike.

But just one look at the iScooter U4 says a lot more than just that. With its chunky tyres and disc brakes, this is a machine ready for anything. And with its 36V, 10.4AH removable battery – offering up to 90km of range – that’s a case of do anything, anywhere.

At the heart of the U4 is an ingenious low step-through alloy steel frame. Foldable in just seconds, the resulting package is ultra-compact and ideal for space-poor homes, offices or even caravans and holidaying. Meanwhile, the easy-access step-through design is ideal for every type of rider.

iScooter U4 battery
The ingenious flip-up saddle mount allows access to the U4’s battery. (Image credit: iScooter)

The frame features a typical seat tube but by flipping the saddle over – thanks to a hinged mount on the adjustable seatpost – reveals the upgraded 374.4Wh lithium battery. With 1000 charge cycles, BMS intelligent safety, overcharge protection, and CE EN15194 certification, this power pack is the U4’s key to reliable and safe performance.

Thanks to that tilt-forward saddle, the battery pack is also easy to extract, meaning home charging is simple and straightforward.

Power at hand

A great battery alone means nothing without additional ingredients to make the most of it. To that end, the U4 uses a robust 500W peak brushless motor, meaning it can reach speeds of up to 15.5mph (restricted) or 20mph (unrestricted), and effortlessly tackle 20% steep inclines.

Controlling and managing motor and battery use is a clear LCD display, mounted on the handlebar and clearly providing all-important real-time ride data at a glance.

iScooter U4 handlebar
The U4’s controls provide power through simplicity. (Image credit: iScooter)

While pedalling assistance and forward momentum is readily at hand, safety and comfort is also well provided for. The durable front suspension fork along with the 2.15in tyres on the 16in wheels offer assured front end control, bump insulation and optimised grip.

That grip really comes into play when using the front and rear disc brakes, which will provide stopping power in all weathers. And when it comes to rider safety, it’s not only the electric motor that sources its power from the battery: the iScooter U4 comes with a 111-lumen LED headlight and a 111-lumen red LED taillight for low-light visibility.

Finally, completing the U4 package are front and rear mudguards, a super-useful rear rack for transporting heavier items, a battery key for security, and a toolkit. And – as the U4 is designed to comply with UK e-bike regulations – it is completely UK road legal, EAPC compliant, and requires no license to ride it.

iScooter U4 folded
In folded form, the U4 is a perfect package. (Image credit: iScooter)

iScooter U4 – full specification

  • Certifications: CE, UKCA & UN38.3 approved
  • Frame: Alloy steel folding frame
  • Saddle: Breathable ergonomic sport cushion seat
  • Wheels: 16in
  • Tyres: 16in x 2.15in pneumatic tyres
  • Seatpost: Adjustable height
  • Suspension: Front suspension fork
  • Brakes: Disc brakes, front and rear
  • Motor: Rated 250W (max 500W)
  • Range: 55-90km / 35-55 miles
  • Speed: 10/15/25kph or 6.2/9.3/15.5mph (restricted). 15/25/32kph or 9.3/15.5/20mph or (unrestricted)
  • Battery capacity: 36V, 10.4Ah lithium battery
  • Charging time: 4-5 hours
  • Battery lifetime: 1,000 charges
  • Lights: 111-lumen LED headlight and taillight
  • Water resistance rating: IP65
  • Bike weight: 26.5kg / 58.42lb
  • Maximum rider weight: 120kg / 264lb
iScooter U4 spec highlights
Speccing highlights: a guide to some of the U4’s most impressive qualities. (Image credit: iScooter)

Extra savings!

By reading this, you can also enjoy some extra money savings. iScooter is offering a 6% site-wide discount with the code road6%, and specifically for the U4 there is an extra £25 off with the code: road25. So a great deal just got even greater!

The iScooter promise

Beyond the qualities of the U4, buying with iScooter comes with various other benefits:

  • Free Shipping. 1-3 days fast delivery and free shipping on all products
  • 30-day return. New, unused products can be returned within 30 days of order delivery
  • Up to 24 months warranty on frame and parts, 12 months warranty on batteries
  • UK customer support with an in-house local team in the UK
  • Spread the cost with Klarna or PayPal – 18+, T&C apply, credit subject to status.

To find out more about the U4 or iScooter’s other mobility solutions, visit www.iscooterglobal.co.uk