Tern HSD S8i

Test Ride
Adding to cart… The item has been added

Talk to our eBike Specialists

With over 10 years experience, our knowledgeable team is on hand virtually or in-store to help you find the perfect eBike, and to ensure you have everything you need to get riding!

eBikes Fully Built

Every eBike is assembled and meticulously inspected by our e-mechanics before collection or delivery.

Convenient Delivery Options

We offer fast and free UK delivery, bespoke home handovers or collection at one of our stores.

Stay Fully Charged

In addition to a 2 year warranty on eBikes, we offer servicing, maintenance and tech support for life.

Who is this bike suitable for?

Tern's HSD boasts an impressively large maximum gross vehicle weight rating of 170kg, meaning the HSD will happily manage the school run, weekend outings or carrying a whole lot of cargo.

With a longer wheelbase and extra-low center of gravity, the HSD is smoother and more stable than your standard ebike. Also it is easy to store, thanks to a folding stem and the capability to stand on it's rear end. A cleverly adjustable stem and seatpost means you can find a comofortable and upright position, while being flexible for the whole family, accommodating riders from 1.5m to 1.95m.

Whether you need to carry kids, cargo or if you want a versatile commuter, the HSD is a bike of many talents, and capabilities.

Electrical System

Assisting you while you nip around town on the HSD is Bosch's Active Line Plus motor. Featuring 50Nm torque, utilised across four modes of assistance (eco, tour, sport, turbo), combined with the 400Wh battery, autonomy will be between 25 and 95 miles.

Combining the Gates CDX Carbon belt with the internal Shimano 8-speed hub gear provides a clean, hassle free and low maintenance ride!

Add Hidden Text Here Show Less

What the expert says

'The HSD can handle up to 374 pounds, accept one child seat, and works with a variety of cargo accessories for the front and rear of all your commuting and errand-running pleasure.

Smooth Riding

Not only does the Active Line Plus motor provide the rider with minimal resistance while switched off, or over 15.5mph, it is also exceptionally quiet and smooth in power delivery.

Providing up to 50Nm of torque across four levels of assistance (eco, sport, tour, turbo), combined with a 400Wh Bosch Power Pack, riders will see between between 25 and 90 miles of assisted travel (conditions, assistance mode, and rider will have an impact).

Add Hidden Text Here Show Less

Gates CDX Carbon Belt

With a lifespan of around 20,000 miles, the CDX carbon belt won't stretch or wear in the same way a chain will. Also around 100g lighter than a traditional chain, with no need to lubricate or degrease, a carbon belt is extremely easy to live with

Bosch Power

A 400Wh Bosch PowerPack provides the power for the HSD to transport you and your cargo to your destination. Riders will see assisted travel between 25 and 90 miles. Conditions, rider and assistance mode will have an impact.

Sleek Display

Situated on the left hand side of the handlebars, the sleek Bosch Purion display packs a lot of data in! From assistance mode to predicted range, the Purion makes ride info easy to view. This display also controls the lighting and Walk Assist.

Impressive Carrying Capacity

The strengthened front mounting point on the HSD S8i allows for the easy transportation of your laptop, dinner, sports kit or many other items. Compatable with a range of Tern accessories.

Stopping Power

Magura MT4 hydraulic disc brakes provide the stopping power, whether you are laden with cargo or on your way to the market, you can place your confidence in your stopping ability.

Tern Andros Stem

Built for riders of 150cm to 195cm, the HSD S8i accommodates for multiple members of the family.



25.4 kg


Bosch PowerPack 400Wh


Magura MT4, hydraulic disc, 180mm rotor (front), 160mm rotor (rear)


Schwalbe Big Ben, 55-406, RaceGuard puncture protection, ECE-R75 ebike certification


Bosch Purion


Tern HSD, 6061-AL


Universal - 150 - 195 cm (59.1 - 76.8 in)


Bosch Active Line Plus (Gen 3)


Gates Carbon Drive CDX belt




Tern Andros (G2), adjustable


Urban with non-slip surface


Atlas H rack, Atlas Rack Mount, 6 point mounting


Tern HSD custom, Gates CDX CNC machined beltring


Shimano Nexus 8 twist grip

Gear System

Shimano Nexus 8


Folded: 163 × 40.5 × 86 cm (64.2 × 15.9 × 33.9 in)

Delivery & Aftercare

Built & checked by expert mechanics

Our experienced eBike technicians will build and inspect your bike before dispatch.

No hassle return in the first 30 days

If you aren't satisfied with your purchase, we accept returns providing the bike is in showroom condition and has covered under 5 miles.

Free & Fast Delivery in the UK

We provide free tracked delivery on all eBikes (excluding eCargo's).

Recommended Service Plan & Guarantee

Free 6-week health check & recommended service plan tailored to you. 2 years manufacturers warrantee on all eBikes.

bottom of deliveray and aftercare container

Related Products


We've got you covered!

30 days of free protection for your ride with every bike purchased, provided by Laka. Their comprehensive insurance will cover you for theft, damage, loss and more. Your cover will start instantly upon activation.



Convenient delivery options

eBikes dispatched in 1-3 working days when in stock. We will contact you to arrange a delivery date, and you'll receive SMS updates with regards to your hours time slot for delivery. Bespoke home handovers are also available for a fee, postcode dependent. Please note eCargo bikes do not qualify for free delivery.


Power up your commute

We work with a number of cycle scheme providers to help make the purchase of your new eBike and accessories more affordable. These initiatives allow you to make a tax-free purchase, saving up to 47%, by paying for the eBike and accessories out of your pre-tax salary. Better still, being a salary sacrifice scheme, the payments are taken out of your salary over an extended period (usually 12 months) meaning you get to spread the costs as well!

Speak to one of our specialists about processing your cycle to work scheme.

ebike image loading