£44.99
TRAILSURGE
COMBINED CUSTOMER REVIEWS
OVERALL RATING ACROSS FOUR PLATFORMS
4.8/5
1909 customer reviews
Combined review snapshot
REVIEWS FROM
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RATING BREAKDOWN
NUMBER OF REVIEWS
78% of reviews are 5-starBased on the combined review counts above
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Isinwheel U4 Step-Through Folding Electric Bike
SKU: ISW-U4-STEP-THROUGH-FOLDING
Barcode: 7458488901228
Motor
250W
Battery
36V 10.4AH
Speed
15.5 MPH
Range
55 MILES
Was
Early Black FridaySave (0% off)
Shop with confidence
We’re a genuine, authorised retailer for selected brands, with our own Nuneaton repairs workshop.
Buying iSinwheel online?
As with a car, ask where you can take your ride if it needs a repair.
Be cautious if a seller can’t give you a local workshop address, especially if they ship from overseas or dropship.
Check with the brand that the seller is authorised and ask who handles warranty repairs.
- ShowroomVisit by appointment
- Repairs workshopOn-site servicing
- Our own stockDispatched by us
TRAIL SURGE LTD
Company No. 16935369 · VAT No. 521226239
Unit 62, Centenary Business Centre, Nuneaton, CV11 6RY
Supporting our local community
- NHS staff
- Local police
- Fire & rescue
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TrailSurge is a UK company and VAT registered too: Company No. 16935369 · VAT No. 521226239.
Klarna£153.33 ×3
Clearpay£115.00 ×4
PayPal£153.33 ×3
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Trail Surge Ltd · Unit 62, Centenary Business Centre, Nuneaton, CV11 6RY
Complete your ride
Choose your delivery setup
Boxed delivery
Usually 3–5 working days
Fully assembled delivery
assembly · Est. 5–7 working days
Next-day delivery
Selected in-stock items
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14 days to cancel after delivery. Up to 30 days for unused, unopened items.
Policy conditions and return costs may apply. Your statutory rights are unaffected.
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TrailSurge Warranty+
1 year of cover UK support
Worth £159 Included
View warranty details Hide warranty details Warranty details Hide warranty details
What’s covered
Frame, forks, motor, controller, battery, charger and factory-fitted electrical and mechanical parts.
Cover & exclusions
Normal wear, accidental damage, misuse and unauthorised modifications are generally excluded.
How to claim
Contact our UK team with your order number and a few photos.
Manufacturer warranty · iSinwheel
Cover varies by model. Contact us for details.
Separate manufacturer terms apply. Warranty periods are not added together.
Road use notice:
This bike is over 250W and is for private land/off-road use only. Need a UK road-compliant option?
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Description
-
Step-through folding frame | Removable 36V 10.4Ah battery | Up to 55 miles manufacturer-stated range
The isinwheel U4 Step-Through Folding Electric Bike combines compact convenience, practical versatility and reliable electric assistance. Featuring a 250W rated motor, removable 36V 10.4Ah battery, 16” tyres and a convenient folding frame, the U4 is designed for comfortable commuting, everyday journeys and effortless storage in smaller spaces.
Smooth & Responsive Electric Assistance
The U4 features a 250W rated brushless motor with up to 500W peak output, providing responsive assistance for daily commuting and moderate inclines. Adjustable speed settings allow riders to adapt their journey, with the standard assistance configuration reaching up to 25km/h (15.5mph).
Compact Step-Through Folding Design
Designed for everyday practicality, the U4 features a low step-through frame for easier mounting and dismounting. Its folding mechanism allows the bike to be stored conveniently at home, in compact spaces or transported in a car boot, making it ideal for urban commuting and flexible travel.
Long-Range Removable Lithium Battery
Powered by a removable 36V 10.4Ah lithium-ion battery, the U4 offers a manufacturer-advertised range of up to 55 miles under optimal conditions. Its detachable design provides convenient charging away from the bike, with a typical full charging time of approximately 4–5 hours.
Comfortable Suspension & Reliable Braking
Equipped with front suspension and 16” x 2.15” pneumatic tyres, the U4 is designed to absorb everyday bumps while maintaining comfortable, stable handling. Front and rear disc brakes provide controlled stopping performance, offering additional confidence across urban roads and suitable cycling routes.
Practical Technology & Everyday Convenience
The U4 features an easy-to-read LCD display, providing essential riding information including speed and battery level. Integrated front and rear lighting enhances visibility, while the practical rear luggage rack and adjustable seating make it a versatile choice for commuting, shopping and leisure riding.
UK Road Use Compliance
Before riding the U4 on UK public roads or cycle paths, confirm that the exact supplied motor rating, assistance cut-off speed and throttle configuration comply with UK EAPC regulations.
Specifications
| Brand | Isinwheel |
|---|---|
| Motor Power | 250W |
| Battery | 36V 10.4Ah |
| Top Speed | 15.5 MPH |
| Max Range | 55 MILES |
| Charging Time | 4-5 Hours |
| Wheel Size | 16 × 2.15" |
| Brakes | Hydraulic Disc Brake |
| Gears | Single-Speed |
| Bike Weight | 26.5 KG |
Size & Rider Fit
Check rider measurements and sizing before you order.
Recommended rider height
4'7" - 5'11"
Recommended rider age
14+
Maximum load
120 KG
More measurements & dimensions
- Handlebar height
- 103.1 cm (40.6")
Sizes are a guide. Rider proportions, footwear and setup can affect fit.
What’s Included in the Box?
1 x Isinwheel U4 Step-Through Folding Electric Bike
1 x Charger
1 x Tool Kit
1 x User Manual
Assembly Information
Assembly Video
Watch the assembly guide below before first setup.
Spare Parts for This Model
We stock a range of spare parts in the UK and can source additional components for this model. Contact our team to check prices, compatibility and availability.
Frequently Asked Questions
Isinwheel U4 Step-Through Folding Electric Bike
£459.99
