Tern HSD S8i Folding 2020 - Electric Hybrid Bike
"Many e-bikes on the market look like standard bikes with motor systems and batteries wedged in," stated Josh Hon, Tern Team Captain. "We started the HSD project with the goal of designing a better, more useful, e-bike. That meant wiping away pre-conceived notions for things like frame design, riding geometry, and wheel size. The result is the HSD, a small bike that is just much more useful."
Easy to Handle
Only 170 cm long, the HSD is shorter than a regular bike. It's a breeze to handle in tight spaces and goes easily where other bikes won't. The HSD flips up for convenient vertical parking and elevator rides, and can be flat-folded in seconds to go into bus racks and SUVs.
Ready to Haul
Despite its diminutive stature, the HSD is a mid-sized cargo bike with serious hauling capacity. With a maximum gross vehicle weight of 170 kg (374 lb) and an XL-sized rack, it'll carry a week's worth of groceries or camping equipment for the weekend. It even has a dedicated trailer hitch mount, so adding extra cargo is a cinch.
The Atlas H Rack is rated to 60 kg (132 lb) and compatible with many different child seat brands, including Thule Yepp and Bobike. An upcoming Passenger Kit will allow riders to continue carrying their kids as they grow older.
Comfier For Everyone
The HSD resizes in seconds to fit riders from 150 to 195 cm (4'11" - 6'5") so everybody in the family—from teens to grandparents—can enjoy the ride. The new Easy-Step frame design offers a comfortable upright riding position for riders tall or small, as well as easy mounts and dismounts. Paired with an adjustable stem and seatpost, a suspension fork, and balloon tires, the HSD delivers a smoother and more comfortable ride even on the meanest cobblestone roads.
Safety-Ready
The HSD gets its genes for strength and durability from the GSD. EFBE Prüftechnik GmbH, one of Europe's leading bicycle test laboratories, has tested the HSD frame and fork to 170 kg (374 lb) according to their own rigorous Tri-Test standard and the upcoming EN Cargo Bike standards. In addition, the HSD is equipped with several safety features that make it ready for almost any situation: integrated front and rear lights, hydraulic disc brakes for all-weather stopping power, puncture-resistant tyres, and even reflective decals.
Powered by Bosch
The HSD is powered by Bosch's next-generation Performance Line or Active Line Plus motors. The motors are smooth, silent, and deliver power with a wonderfully natural feeling. And of course every motor and battery system is backed by Bosch's best-in-class warranty and service.
A Whole Lot More
On top of all the standard features mentioned above, different HSD models are also packed with extras like Gates belt drives, Abus keyed-alike frame locks, and Cane Creek Thudbuster suspension seatposts.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Tern HSD, 6061-AL, patented design, Tern sliding dropouts |
| Fork | Suntour custom for Tern, 1.5" tapered Chromoly steerer, 32 mm stanchions, Thru-axle |
| Headset | Tern Flux Pro Taper, 1.5", angular contact bearings, Physis integrated |
| Stem | Tern Andros (G2), adjustable, forged construction, patented technology |
| Bars | Tern Sweep, 6061-AL, Tern Andros adapted |
| Shifters | Shimano Nexus 8 |
| Speed | 8 |
| Rims | Tern Atlas H, wide 35 mm |
| Spokes | Stainless steel |
| Front Tyre | Schwalbe Big Ben, 55-406, RaceGuard puncture protection |
| Rear Tyre | Schwalbe Big Ben, 55-406, RaceGuard puncture protection |
| Seat Post | Tern Telescope, 34.9/30.9 mm, 2014-AL |
| Saddle | Tern HSD |
| Chainset | Tern HSD custom, Gates CDX CNC machined beltring |
| Bottom Bracket | Motor integrated |
| Chain | Gates Carbon Drive CDX belt |
| Cassette | Gates CDX, precision CNC machined cog |
| Pedals | Urban with non-slip surface |
| Battery Size (WH) | 400wh |
| Motor | Bosch Active Line Plus (Gen 3), max speed 15.5 mph (25 kph) |
Electric Bike Bike Size Chart
|
Height |
e Bike Size |
e Road Bike Size |
e Mountain Bike Size* |
|
4’8” – 5’1” 143 – 155 cm |
XXS |
44 cm |
13” (33 cm) |
|
5’1” – 5’4” 155 – 163 cm |
XS |
48 cm |
15” (38 cm) |
|
5’4” – 5’7” 163 – 170 cm |
S |
51 cm |
16” (41 cm) |
|
5’7” – 5’10” 170 – 178 cm |
M |
54 cm |
18” (46cm) |
|
5’10” – 6’0” 178 – 183 cm |
L |
56 cm |
19” (48cm) |
|
6’0” – 6’3” 183 – 191 cm |
XL |
58 cm |
20” (51 cm) |
|
6’3” – 6’5” 191 – 196 cm |
XXL |
60 cm |
21” (53 cm) |
|
6’5” – 6’9” 196 – 205 cm |
XXXL |
62 cm |
22” (56 cm) |
* Mountain bikes are sized differently to road bikes. Typically, they are sized in inches as the first MTBs were produced in the USA. European brands like Lapierre and Haibike like to use centimeters for all their bikes. The measurements of their mountain bikes doesn’t match their road bikes but is like a simple conversion from the inches measurement. This is why we have included cm measurements in brackets for the e mountain bike column.
See our bike size guide for more on bike sizing
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