Tern NBD S5i

What the Tern NBD S5i is built for

The Tern NBD S5i is a commuter e-bike, built for daily rides to work, errands and city streets.

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

It carries a stated range of up to 74 miles (119 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 NBD S5i weighs 52 lb (23.4 kg) and carries up to 309 lb (140 kg) including the rider.

In the United States the Tern NBD S5i sells for $3,899, above the median of $1,700 across 311 commuter e-bikes with a US price, among the premium models.

Where the Tern NBD S5i 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 NBD S5i safety certification

The brand's listing for the Tern NBD S5i does not state a UL 2849 or EN 15194 certification. New York City allows only e-bikes certified to UL 2849 to be sold or rented there, and California requires certified batteries from 2026; ask the seller for the certificate before buying.