More Power, More Torque, More Thrill!
The Synch Ultra Monkey 250W is designed for riders who crave extra acceleration, increased torque, and an electrifying ride. Whether you're tackling rugged trails, open fields, or private tracks, this British-built fat tyre e-bike delivers an unrivalled off-road experience.
Powered by a 250W Bafang hub motor and a high-performance 48V UK-manufactured battery, the Ultra Monkey provides instant torque and responsive handling, making every ride an adrenaline rush. The fat tyres, combined with a lightweight yet durable frame, ensure maximum grip, comfort, and control over any terrain.
Exclusive UK-Manufactured Battery – Built for Performance
Unlike most e-bikes, the Ultra Monkey is powered by a British-made battery, manufactured by Danecca in Silverstone—a first in the industry. This ensures higher efficiency, reliability, and longevity, keeping you riding longer with superior power output.
Off-Road Ready Features
- 250W Bafang rear hub motor – Delivers smooth, high-torque performance.
- 48V UK-manufactured battery – Long-lasting power with a quick recharge time.
- Fat tyre setup – Superior traction and shock absorption on any surface.
- Throttle fitted as standard – Strictly for off-road/private land use only.
- Responsive handling – Agile yet stable for ultimate control.
Custom Colour Options – Make It Yours!
Stand out with custom colour options – pick any shade from the RAL chart, and we'll build your Ultra Monkey in your chosen finish.
Handcrafted in the UK & Built to Order
Each Ultra Monkey is designed, built, and assembled in the UK, ensuring top-quality craftsmanship.
✅ 2-year warranty on the frame and forks
✅ 1-year warranty on the electrics
✅ White Glove Delivery – Fully assembled and ready to ride.
Limited Availability – Order Yours Today!
All Synch Ultra Monkey bikes are built to order, with a lead time of 2 weeks.
🚀 Experience the ultimate off-road thrill – order your custom Ultra Monkey today! 🇬🇧
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
Large Range
LCD Display
Comfort
High Quality Parts
Off Road Riding
Accessories
specifications
Battery and Range
Motor
Battery
Suspension
Display
Lights
Brakes
Tyres
Gears
Frame
Max Speed
Max Rider Weight
Weight
Warranty
Delivery and Returns
Frame and Forks
2 years -
Electrical system
1year
The Warranty is made to the original owner only and is non-transferable.
*excluding wear and tear, damage (accidental or otherwise).