The Tern Vektron Q9 is a compact 20-inch folding e-bike built for commuters who mix cycling with trains, cars and tight storage. A Bosch Active Line Plus 250W mid-drive motor delivers smooth, near-silent assistance up to 50 Nm, drawing on a 400 Wh Bosch PowerPack for a real-world range of 55 to 110 km. Because assistance cuts out at 25 km/h (15.5 mph) and you keep pedalling, it is a fully UK road-legal EAPC, requiring no licence, tax or insurance.
Tern’s reinforced OCL+ frame folds in around ten seconds and stands upright for easy rolling, while the Andros stem and resize mechanism let riders from 147 to 195 cm share one bike. A Shimano Alivio 1×9 drivetrain, hydraulic disc brakes and cushioned Schwalbe Big Apple tyres handle hills and city surfaces with confidence.
- Bosch mid-drive with Purion display and walk assist
- Genuine 10-second fold for trains, boots and under desks
- Integrated Atlas rack carries up to 27 kg of cargo
- One size fits a wide range of riders, 21.9 kg total weight
A Closer Look at the Tern Vektron Q9
A Bosch Active Line Plus motor delivering 50Nm might look modest next to a cargo bike’s Cargo Line unit, but it’s the right choice for a folding commuter: smooth, quiet and light, drawing from a 400Wh Bosch PowerPack for a genuine 55-110km real-world range. Because assistance cuts out at 25km/h with no throttle, it stays fully inside UK EAPC rules while still taking the effort out of hills on the way to the station.
The real engineering is in the fold: Tern’s reinforced OCL+ frame collapses in around ten seconds and stands upright afterwards rather than falling over, and the Andros stem and resize mechanism let riders from 147cm to 195cm share the same bike — useful if more than one person in the household will be using it.
Who Rides the Vektron Q9, and Where
This is built for commuters who mix cycling with trains, cars, or tight storage — a genuine full-power folding e-bike rather than a compromise, for anyone whose journey doesn’t start and end on two wheels. Because assistance cuts out at 25km/h (15.5mph) and there’s no throttle, it’s a fully UK road-legal EAPC requiring no licence, tax or insurance.
Setup & Care
Shimano Alivio 1×9 gearing needs standard chain and derailleur care. Charge the 400Wh PowerPack per the Bosch and Tern documentation below, and get familiar with the ten-second fold sequence before you need to rely on it for a train connection — rushing it is the most common cause of avoidable wear on the hinge mechanism. The integrated Atlas rack is rated to 27kg; don’t exceed that even for a short ride.
Downloads
Tern Vektron Q9: Frequently Asked Questions
How quickly does it fold, and how compact is it?
Around ten seconds to fold to approximately 42 x 86 x 68.5cm, and the frame stands upright afterwards rather than needing to be leant against something.
Is it road legal, and do I need a licence?
Yes — assistance cuts out at 25km/h (15.5mph) with no throttle, making it a fully UK road-legal EAPC. No licence, tax or insurance is required.
How do I pay, and is finance available?
We currently accept payment by bank transfer. Card payments are coming soon — finance is planned but not yet live; see our Finance page.
What’s your returns policy?
14-day hassle-free returns on unused bikes in original packaging; faulty bikes receive a free collection. Full terms on our Delivery & Returns page.
What size riders does it fit?
One adjustable frame size fits riders from 147cm to 195cm (4’10” to 6’5″), with a maximum rider weight of 105kg.
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