Tern Vektron P5i

What the Tern Vektron P5i is built for

The Tern Vektron P5i is a folding e-bike that packs down to fit a car boot, an apartment or a train.

It has 65 Nm of torque and a top speed of 20 mph (32 km/h).

It carries a 400 Wh battery and a stated range of up to 70 miles (113 km) on a charge. Real-world range is usually lower than the rated figure: it falls with throttle use, hills, cold weather, rider weight and higher assist levels.

The Tern Vektron P5i weighs 53 lb (23.9 kg) and carries up to 276 lb (125 kg) including the rider.

In the United States the Tern Vektron P5i sells for $4,099, above the median of $950 across 28 folding e-bikes with a US price, among the premium models. That is $10 per watt-hour of battery.

Where the Tern Vektron P5i may be ridden

In the European Union and the United Kingdom an e-bike counts as a bicycle only within the pedelec limits; as specified, its 20 mph (32 km/h) top speed is above the 25 km/h at which assistance must stop. A model above those limits is treated as a moped there, with type approval, registration and insurance, unless the brand sells a version set to the European limits.

Tern Vektron P5i safety certification

The brand states that the Tern Vektron P5i is certified to EN 15194 and UL 2849.

EN 15194 is the European standard for electrically power-assisted cycles (pedelecs), covering electrical and mechanical safety.

UL 2849 is the US safety standard for the whole electrical system of an e-bike: battery, charger, motor and controller tested together.

New York City allows only e-bikes certified to UL 2849, with batteries certified to UL 2271, to be sold or rented there; California requires e-bike batteries to meet UL 2849 or EN 15194 from 2026.