Overview: Tern HSD S8i

The Tern HSD S8i is an electric bike designed for urban and cargo use, with an upright riding position. Tern is a top player in the folding bike industry and an early innovator in electric bikes. The HSD midtail cargo model is a folding electric bike that combines utility with portability.   There are three models: the Tern HSD S+ ($5,199) with a Bosch Performance Line motor and Enviolo Sport 380 CVT drivetrain, the Tern HSD S8i ($3,799) with a Bosch Active Line Plus motor and Shimano Nexus 8 internally geared hub, and the Tern HSD P9 ($3,199) with a Bosch Active Line Plus motor and Shimano Alivio 9-speed rear derailleur.   It falls into the Pedal Assist (Class 1) category, meaning that it provides motor assistance only while the rider is pedaling and stops once the bike reaches a speed of 20mph. The Tern HSD S8i is priced at $3,799, and it was released in 2020. The Tern HSD S8i is designed for use in neighborhoods, urban areas, and for commuting purposes. Its upright riding position provides a comfortable ride and excellent visibility for the rider. Additionally, the Tern HSD S8i is designed to carry cargo, making it a great option for those who need to transport goods or equipment. The Tern HSD S8i is available worldwide, including Canada, the United States, and Europe. It comes with a 2-year comprehensive warranty and a 10-year frame warranty, providing peace of mind for buyers.

• HSD is a midtail electric cargo bike that can be stored vertically to save space.
• It is available in eight colors (four for the S8i configuration) but only one frame size.
• The slack seat tube angle and two seat post segments provide a range of fit options for different rider heights.
• The HSD is lighter and less expensive than the Tern GSD model.
• Comes with premium fenders, custom suspension fork, adjustable-angle Andros stem, and ergonomic grips for added comfort.
• It has a lower weight capacity than the GSD and can only handle one child seat.
• The Schwalbe Big Ben tires on the HSD provide puncture protection and reflective sidewalls for visibility.
• The HSD features premium integrated lights with an excellent headlight position and aiming.
• Magura hydraulic disc brakes offer great stopping power, with an extra-large 180mm front rotor.
• The HSD is powered by a capable but quiet Bosch Active Line Plus motor, paired with the lightweight and reliable Bosch PowerPack 400.
• Tern chose to include the faster 4 amp Bosch ebike charger.
• The Bosch Purion display on the HSD is not removable and does not provide USB charging or smartphone app support, but it's less likely to get damaged when folding the stem.
• The Bosch Active Line Plus motor has a limited 105 RPM pedal cadence compared to the Performance Line.
• The HSD features a Gates Carbon belt drive, which is quiet and reliable, and a Nexus 8-speed internally geared hub that is durable and can shift at standstill.
• These features add cost and weight to the HSD.

The Tern HSD S8i is the lightest model at 55.9lbs due to its belt-drive system. The S+ also uses a belt, but weighs slightly more at 57.9lbs due to its ENVIOLO CVT drivetrain with automatic shifting. The P9 is a good choice for active riders who prefer fast shifting, as the Bosch motor controller provides shift detection for the derailleur setup, but not for the ENVIOLO or Nexus hubs. While the hubs require less maintenance and can be shifted at a standstill, they may not be as efficient or quick as a traditional chain with derailleur.

Specifications: Tern HSD S8i

Make	Tern
Model	HSD S8i
Price	$3,799
Body Position	Upright
Suggested Use	Neighborhood, Urban, Cargo, Commuting
Electric Bike Class	Pedal Assist (Class 1)
Warranty	2 Year Comprehensive, 10 Year Frame
Availability	Canada, United States, Europe, Worldwide
Model Year	2020
Motor Brand	Bosch Active Line Plus (Gen 3)
Motor Type	Mid-Mounted Geared Motor
Motor Nominal Output	250 watts
Motor Torque	50 Newton meters (Eco: 35, Tour: 40, Sport: 45, Turbo: 50)
Battery Brand	Bosch PowerPack 400, 18650 Cells
Battery Voltage	36 volts
Battery Amp Hours	11 ah
Battery Watt Hours	396 wh
Battery Chemistry	Lithium-ion
Charge Time	3.5 hours
Estimated Min Range	40 miles (64 km)
Estimated Max Range	90 miles (145 km)
Display Type	Bosch Purion, Fixed, 1.75" Grayscale LCD, Buttons: +, -, Walk Mode, (Hold + for Lights, Hold - to Cycle Through Readouts, Hold - and Press Power to Change Units) (Removable, Symmetrical Integrated Buttons for Right or Left Handed Users)
Readouts	Speed, Assist Level (Eco, Tour, eMTB, Turbo), Battery Level (1-5), Trip Distance, Total Distance, Estimated Range, Lights
Display Accessories	Micro-USB Port on Right Side of Display for Diagnostics and Software Updates Only
Drive Mode	Advanced Pedal Assist (Measures Rear Wheel Speed, Pedal Cadence, and Pedal Torque over 1,000x Per Second, Power Output Relative to Pedal Input: Eco 40%, Tour 100%, Sport 170%, Turbo 250%)
Top Speed	20 mph (32 kph)(25 km/h in Europe)
Total Weight	55.9 lbs (25.35 kg) (64.9lbs As Shown with Racks and Bags)
Battery Weight	5.5 lbs (2.49 kg)
Motor Weight	7.05 lbs (3.19 kg)
Frame Material	6061 Aluminum Alloy
Frame Sizes	16.75 in (42.54 cm)(Folded Size 39 cm x 86 cm x 84 cm)
Geometry Measurements	16.75" Seat Tube, 20.25" Reach, 18.5" Stand Over Height, 31" Minimum Saddle Height, 43.5" Maximum Saddle Height, 27" Width, 46" Wheel Base, 68.5" Length, Folded Size: 64" x 15.9" x 34"