The Ultimate Two-Seater Electric Bike
The Synch Longtail 250W blends retro styling with modern electric performance, offering a class-leading ride experience for both solo adventures and two-person journeys. Designed for versatility, comfort, and power, this extended-seat e-bike is perfect for urban commuting, weekend getaways, or simply sharing the ride.
With its striking design, the Longtail takes inspiration from the popular Super Monkey model, adding extra capacity without sacrificing performance. Whether you're cruising through city streets or tackling scenic countryside routes, this British-built electric bike is engineered for reliability and style.
Hand-Built in the UK with British-Made Batteries 🇬🇧
Each Synch Longtail is designed, built, and assembled in the UK, ensuring the highest standard of craftsmanship. Unlike most e-bikes, Synch is the first electric bike company to use UK-manufactured batteries, supplied by Danecca, a specialist battery manufacturer based in Silverstone.
Powerful, Responsive & Built for Adventure
- 250W Bafang rear hub motor delivers smooth and consistent power.
- 48V 16Ah UK-manufactured battery provides up to 40 miles of range with a quick 4-5 hour recharge time.
- Torque sensor drive system intuitively adjusts power based on your pedaling effort, ensuring a natural and efficient ride.
- Shimano 7-speed gears allow you to adapt effortlessly to different terrains.
- Tektro hydraulic disc brakes offer precision stopping power in all conditions.
- Front suspension forks absorb bumps and enhance ride comfort.
- Puncture-resistant Synch tyres provide durability and grip on varied surfaces.
Custom Colour & Accessories – Make It Uniquely Yours
With Synch's custom colour option, you can design your Longtail 250W to suit your personal style—simply choose any shade from the RAL chart, and we’ll build it in your selected finish.
Enhance your ride further with optional accessories, including:
✔️ LED headlight & rear light for improved visibility
✔️ Mudguards to keep your ride clean
✔️ Foot pegs for a comfortable two-person setup
✔️ Front rack & caddy for extra cargo space
Designed for Comfort & Stability
With an extended frame for added balance and a step-over design, the Longtail 250W is perfect for riders between 5’4” and 6’3”. Weighing 29kg, with a total length of 175cm and a height of 114cm, it offers a stable, smooth, and comfortable ride every time.
2 Year Warranty & White Glove Delivery
- 2-year warranty on the frame and forks
- 1-year warranty on electrics
- White Glove Delivery – arrives fully assembled, ready to ride, with no setup required.
Built to Order – 2-Week Lead Time
Each Synch Longtail 250W is built to order with a current production lead time of 2 weeks.
🚲 Order today and experience British-built electric biking at its finest! 🇬🇧
Please note the LED front headlamp is not included in the price and is an optional extra.
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 |
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 |
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
Built to Order in the UK
Torque Sensor Drive System
Comfortable 2 Seater
UK-Manufactured Batteries 🇬🇧
Customisable Bike
Ready-to-Ride White Glove Delivery
specifications
Battery and Range
Motor
Dimensions
Display
Lights
Brakes
Tyres
Gears
Max Speed
Rider Height
Bike Weight
Warranty
Delivery and Returns
Customer Reviews
Love the fact you set the speed up to what you feel.Love the retro look.The options are there so you can set gear assist and battery resistance to your desire.Overall delightful experience,Thanks Synch.
Lovely to look at, comfortable ride but hill performance is lacking. Only to be expected as this is a hub motor. Manages 18 miles on a single charge but don't expect to be able to go more than a snails pace without pedal assist. Having said all that it is thing of beauty and ideal for urban environment (as long as there are no hills). My kids love riding on the back. We use a kids motorcycle harness to make sure they don't wobble off.
Excellent purchase. Got it within two weeks. Love cruising around on it, even with someone on the back it is effortless. Haven't moved the car for weeks!
Frame and Forks
2 years
Electrical system
1 year
The Warranty is made to the original owner only and is non-transferable.
*excluding wear and tear, damage (accidental or otherwise).