Synch Longtail Step Through Monkey Electric Bike 250W

+ FREE WHITE GLOVE DELIVERY
£2,199.00
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Warranty: 2 Years

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Synch Longtail Step-Through 250W – Hand-Built in the UK

The Synch Longtail Step-Through (ST) Electric Bike is designed for exceptional versatility, making it a standout addition to the Synch range. With its easy-access step-through frame, this model provides effortless mounting and dismounting, ensuring a comfortable ride for all abilities. Whether you're commuting, running errands, or sharing the ride with a passenger, the extended two-seater design gives you the extra space you need without compromising on style or performance.

🇬🇧 Hand-Built in the UK with British-Made Batteries 

Every Synch bike is designed, built, and assembled in the UK, ensuring premium craftsmanship and attention to detail. Unlike most e-bikes on the market, Synch is the first electric bike company to use UK-manufactured batteries. These 48V power packs are produced by Danecca in Silverstone, a leading specialist in custom battery systems.

Effortless Power & Control

  • 250W Bafang rear hub motor delivers a smooth, powerful ride.
  • Torque sensor drive system responds intuitively to your pedaling, providing instant and natural power when you need it.
  • 48V 16Ah battery offers up to 40 miles of range on a single charge with a fast 4-5 hour recharge time.

Built for Stability, Safety & Comfort

  • Shimano 7-speed gears for adaptable riding across different terrains.
  • Tektro hydraulic disc brakes provide responsive, reliable stopping power.
  • Suspension front forks for a smoother ride, absorbing bumps on rougher roads.
  • Puncture-resistant Synch (by Innova) tyres for enhanced grip, comfort, and durability.

Customise Your Ride – Choose Your Own Colour

Make your Synch Longtail ST truly unique with custom colour options. Simply pick any shade from the RAL chart, and we’ll build your bike in your chosen finish. Additional accessories, such as a sissy bar for a rear passenger, are available to enhance your setup.

Designed & Built for Everyday Adventures

The Longtail ST is built for riders 5’2” to 6’3”, with a total weight of 29kg and a frame length of 175cm. Its stable design and extended seating make it perfect for urban commutes, family outings, and weekend getaways.

2-Year Warranty & Ready-to-Ride Delivery

  • 2-year warranty on the frame and forks
  • 1-year warranty on electrics
  • White Glove Delivery – arrives fully assembled and ready to ride.

Each Synch Longtail ST is built to order, with a production lead time of 2 weeks. Order yours today and experience British-built electric biking at its best! 🚲🇬🇧

 

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

Built to Order in the UK 🇬🇧

Each Synch bike is hand-built to order at the Synch factory in Devon, ensuring top-tier craftsmanship and attention to detail.

Torque Sensor Drive System

The upgraded torque sensor system provides instant power when you put pressure on the pedals, delivering a smooth, natural, and responsive ride.

Comfortable 2 Seater

The Longtail is specifically designed with an extended seat, providing comfortable seating for two people. Whether you're enjoying a leisurely ride with a friend or sharing the adventure with a loved one, the extended seat ensures that both passengers can relax and enjoy the journey together.

UK-Manufactured Batteries 🇬🇧

Powered by Danecca, a leading UK-based battery manufacturer in Silverstone, these high-performance batteries ensure exceptional reliability and longevity.

Ready to Ride – White Glove Delivery

Your Longtail ST arrives fully assembled and ready to ride, thanks to our premium White Glove Delivery service— zero assembly required.

2-Year Warranty for Peace of Mind

Ride with confidence, knowing your frame and forks are covered for 2 years, with a 1-year warranty on the electrics.

specifications

Battery and Range
48v 16Ah (up to 40 miles of range, more if lower level of assist is used). ** Range according to battery capacity. It is also dependent on the different riding conditions - terrain, rider weight, tyre pressure, headwind etc.
Motor
Bafang rear hub motor 250W
Sensor
Torque Sensor
Display
Light up LCD display, 5 levels of assist plus walk mode
Lights
(optional add on) LED front headlamp, Rear LED brake and tail light.
Brakes
Tektro hydraulic disc brakes
Tyres
Synch (by Innova) puncture resistant tyres - 20" x 4"
Gears
Shimano 7 speed gears
Max Speed
15.5MPH
Bike Dimensions
Bike Height 114cm, Bike Length 175cm
Rider Height
5'2" - 6'3"
Max Rider Weight
120kg
Bike Weight
29kg (including battery)
Warranty
Motor and battery 1 year, frame and forks 2 years
Delivery and Returns
REE WHITE GLOVE DELIVERY ON ALL OUTRIGHT PURCHASES. Please note cycle to work orders will be required to pay £99 for delivery. Delivery 2-3 weeks. 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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