Tern Link D8 with BionX Review

Tern Link D8 With Bionx Electric Bike Review 1
Tern Link D8 With Bionx
Tern Link D8 With Bionx Motor Suntour Cassette
Tern Link D8 With Bionx Removable Battery Pack
Tern Link D8 With Bionx Display Throttle
Tern Link D8 With Bionx Portage Rack
Tern Link D8 With Bionx Rear V Brake
Tern Link D8 With Bionx Steel Fork
Tern Link D8 With Bionx Electric Bike Review 1
Tern Link D8 With Bionx
Tern Link D8 With Bionx Motor Suntour Cassette
Tern Link D8 With Bionx Removable Battery Pack
Tern Link D8 With Bionx Display Throttle
Tern Link D8 With Bionx Portage Rack
Tern Link D8 With Bionx Rear V Brake
Tern Link D8 With Bionx Steel Fork


  • High quality folding frame from Tern combined with sophisticated and quiet drive system from BionX
  • Four levels of pedal assist and regen as well as regenerative braking and variable speed trigger throttle
  • One of the most compact folding ebikes around, display panel and battery pack are removable for convenience and reduced weight

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Video Review

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Link D8 with BionX


$2,700 USD

Body Position:


Suggested Use:

Travel, Urban

Electric Bike Class:

Throttle on Demand (Class 2)
Learn more about Ebike classes


5 Year Frame, 2 Year Electronics and Battery


United States

Model Year:


Bicycle Details

Total Weight:

42 lbs (19.05 kg)

Battery Weight:

6 lbs (2.72 kg)

Motor Weight:

9 lbs (4.08 kg)

Frame Material:

7005 Aluminum

Frame Sizes:

(Folded Size 38 cm x 79 cm x 72 cm)

Frame Types:

Folding (Patented OCL Joint, DoubleTruss Technology)

Frame Colors:

Black with Blue Accents

Frame Fork Details:

Hi-Tensile Steel

Attachment Points:

Fender Bosses, Rack Bosses, Bottle Cage Bosses

Gearing Details:

8 Speed 8x1 Suntour Neos 1.0, (12-32T)

Shifter Details:

SRAM MRX Comp Half-Twist on Right Handle Bar


Folding Aluminum and Plastic Platform


Flux, Cartridge Bearings, Tri-Seal Technology


Physis 3D, Forged Aluminum


Flat (Aluminum)

Brake Details:



BioLogic Ergo



Seat Post:

SuperOversize, 6061 Aluminum with Micro Adjust Clamp


Aluminum (With Brass Spoke Nipples)


Stainless Steel

Tire Brand:

Schwalbe Citizen with Puncture Protection, 20" x 1.6"

Wheel Sizes:

20 in (50.8cm)

Tire Details:

Reflective Sidewalls


Front and Rear Fenders with Mud Flaps, Rear Portage Rack with Bungee Cords


Magnetix 2.0 Folding Clasp Connector, Water Bottle Cage Bosses on Right of Main Tube

Electronic Details

Motor Brand:


Motor Type:

Rear-Mounted Gearless Direct Drive Hub
Learn more about Ebike motors

Motor Nominal Output:

350 watts

Motor Torque:

40 Newton meters (10 Nm Nominal)

Battery Brand:


Battery Voltage:

48 volts

Battery Amp Hours:

6.6 ah

Battery Watt Hours:

316.8 wh

Battery Chemistry:

Lithium Manganese Cobalt

Charge Time:

3.5 hours

Estimated Min Range:

35 miles (56 km)

Estimated Max Range:

50 miles (80 km)

Display Type:

Backlit LCD (Removable, Symmetrical Integrated Buttons for Right or Left Handed Users)


4 Proportional Assist and Generate Modes, Lighting Controls, Battery Voltage, Trip Distance, Odometer, Chronometer, Average Speed, Clock

Display Accessories:

Independent Button Pad (With Variable Speed Trigger Throttle) (With Variable Speed Trigger Throttle)

Drive Mode:

Torque Sensing Pedal Assist, Trigger Throttle (Throttle Will Not Activate Below 2 mph, Assist Levels 35%, 75%, 150%, 300%)

Top Speed:

20 mph (32 kph)

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Written Review

The Tern Link D8 with BionX is an ultra portable folding electric bike with a higher-end drive system from BionX. It folds perfectly with the battery attached but you can also take it off to reduce weight or charge separately. The motor offers excellent torque, multiple levels of assist and regen, regenerative braking and throttle operation and it runs extremely quiet. Both Tern and BionX are respected manufacturers, known for quality builds and good support. In my opinion they’ve created one of the most functional, well balanced and beautiful folding electric bikes around with the Link D8. Its smaller 20″ wheels enable the super small form factor (when folded) but aren’t as smooth as the larger 24″ wheels chosen for the Node D8. Depending on your needs, either bike performs well but costs a bit more than some entry level folding ebikes that lack assist and some of the nicer accessories in use here.

The motor driving the Tern Link D8 electric is a 350 watt gearless direct drive hub from BionX. It’s located in the rear wheel and painted black to match the Tern frame. Note that this motor has a larger diameter and higher weight than some equally specced gearless hubs but delivers increased toughness and quieter operation. I’m not aware of many folding electric bikes that offer regenerative braking or regen modes but the Link D8 with BionX has both. There are actually four levels of regen here to help you recapture energy while simultaneously slowing the bike and sparing your brakes when coasting down hills. This feature can also be used as a form of increased challenge if you want to raise your heart rate and don’t have any hills around to climb. While this bike does not have a rear quick release mechanism (only on the front wheel) the rear wheel remains easy to service because the motor has a built in torque sensor vs. an external dropout strain gauge.

Powering the Tern Link D8 is a BionX-made Lithium-ion battery pack containing Panasonic cells (known for being super high quality). It offers 48 volts of power which is above average. This has several benefits including increased torque, improved climbing ability and more efficient electricity transfer. In terms of overall capacity, this pack is slightly smaller than the stock BionX kits but that enables the folding feature mentioned earlier and keeps the overall weight of the bike down. At 42 pounds (with the 6 pound battery attached) this isn’t the world’s lightest folding ebike but that’s due in part to the high quality fenders and rack that add utility. You could always remove these extras to shave a bit off and reduce any rattling noise that can develop over time with use, folding and storage.

The control panel on this bike is one of my favorites because it’s slim, removable, backlit and packed with readouts but not overly complex to use. It’s a second generation display from BionX with four buttons (two on each side) that are symmetrical – designed to be usable on the left or right hand side. What I’ve found is that I usually only press the upper right hand button on the display to get the bike powered up and then rely on the stand-alone button pad and throttle which are mounted on the right handle bar. Many ebikes forego throttles but it can be useful when your legs get tired (especially on a smaller bike like this) or when trying to balance groceries or packages. The rear rack helps out with the latter experience but you get the point… imagine crossing a puddle and wanting to keep your feet raised temporarily but still needing to move forward, that’s where throttles can really shine. On this system (as well as other BionX) you have to get the bike up to 2 mph before the throttle will activate and this is a safety feature. Aside from the display and buttons I like the ergonomic grips and simple grip-shifter on the right side of the handlebar. You might consider adding a bell and lights to this setup depending on your intended use. I should mention that only the right brake lever has a motor cutoff and regen activator built in. If you brake with the left lever, regenerative braking will not activate. This is a minor gripe and again, a design feature related to all BionX kits at the time of this review.

The Tern Link D8 with BionX combines two proven platforms. The locking mechanisms and folding design from Tern are superb and I love the magnetic clasp designed to keep the bike from unfolding. The silent and durable motor from BionX feels zippy and the removable battery is very convenient. I’m a fan of pedal assist but see the value in throttles so it’s nice that this folding ebike offers both. The eight speed cassette delivers a good range for climbing or pedaling fast (which can be precarious on a smaller 20″ wheel bike like this). I like the reflective sidewalls on the wheels and am okay with the standard v-brakes and plastic folding pedals. The crank arms on this bike are actually quite long for a smaller bike and that makes pedaling feel natural. While many folding electric bikes opt for rear mounted batteries I love that this one has a more balanced weight distribution and appreciate that they even added water bottle cage bosses on the side of the downtube so you can still bring some fluids along (you could also store water in a bag on the rear rack). If you’re looking for quality but need an extremely small footprint on your boat, RV or closet then the Link D8 would be an excellent choice.


  • Solid two year warranty on the frame, drive system and battery pack – Tern and BionX are both large, well established companies
  • Beautiful aesthetic with matching black and blue frame, custom black hub motor and black battery casing featuring co-branded Tern + BionX art
  • Just about every drive mode you could ask for including four levels of torque sensing pedal assist, four levels of energy regeneration and variable speed trigger throttle
  • Independent button pad on right side of handle bar is easy to reach (to change assist mode or use the throttle) doesn’t require that you take your hand off the grip to use
  • Battery pack can be charged on or off the bike, does not have to be removed for the frame to fold completely
  • Motor is powerful, durable (thanks to the gearless direct drive configuration) and very quiet to operate
  • Full length front and rear fenders with mud flaps, rear carry rack includes built in bungee cords for securing cargo
  • Several nice extras including reflective sidewalls on tires and backlit LCD display panel for improved safety during evening and night riding, ergonomic grips for improved comfort and magnetic clasp for secure folded position
  • Good weight distribution with the 9 pound hub motor at the rear and the 6 pound battery pack mounted forward on the downtube
  • BionX battery has a deep sleep protection feature that keeps it from discharging in a way that could hurt the battery over longer periods of storage
  • Satisfying to pedal thanks to the longer crank arms and eight speeds cassette, good for climbing or riding faster


  • Smaller 20″ wheels allow the bike to achieve an extremely small folded footprint but don’t offer the same cushion or gap-spanning potential as larger wheels, consider the Tern Node D8 which has 24″ wheels if this is a concern
  • Only the right brake lever cuts power to the motor and activates power regeneration mode, it would be nice if both did
  • Rear wheel does not feature quick release, will have to use traditional tools during maintenance or fixing a flat


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Franco Bujosa
3 years ago

Where can I purchase this? I have looked online, even Tern’s website and NYCEWheels and with no success. When will you review the Tern eLink?

3 years ago

Hi Franco! I reached out to Tern regarding availability of the Link D8 and they said “If interested in locating a Tern Link D8/Node D8 with BionX please contact north.america@ternbicycles.com so we can assist you in finding a Tern retailer in your area.” sorry I can’t be more specific… I feel like NYCeWheels should be able to special order one for you? I hope to review the eLink eventually and will post it here as soon as I do :D


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5 hours ago

I own both Abus and Kryponite locks. Good locks. The first Kryponite lock I purchased in '90 or '91, before the internet and it's reviews. I was encouraged by the free policy that came with it. I figured if they were that confident, I should be too. I've never had a bike stolen or a lock fail. I still have that first Kryponite lock. Now as I've read, in order to collect from Kryponite they want the defeated lock. That has been the the problem for many trying to collect. If you look at the video I posted earlier in this thread you can see the thief riding away with the lock. Just food for thought, information for the thread. I'd consider paying the 25 bucks, even if the odds of collecting are against it.

If you stack all the safeguard efforts together, best practices on where and how to lockup, insurances, etc, you might just come out on top! Or at least not lose too much.

8 hours ago

You know it may have been Lenny's. Shop in Wisconsin and Florida, is that Lenny's? So sorry to misrepresent the conversation.

So let me ask you as I've gotten conflicting info. When I see specs of a Haibike SDURO 4.0 (Yamaha motor) I see it listed as both 250W and 500W. Can you please clarify? As for the bike I gave it a test ride but there were only moderate hills around and I can not find a place to rent one.

I'm 59, 6'3" 240 pounds and not an avid cycler, riding maybe 100 miles/year. I am moving to the mountains in retirement (where I will be older obviously) and need a bike with enough torque to get my fat butt up a mountain. Speed and range unimportant but I need to be able to climb hills. Is this motor enough?

9 hours ago

Crazy Ray's ? I hope you were talking Lenny's.
While in general center drive (bottom bracket) motors deliver more usable power to the ground, especially if you are measuring the torque, they tend to be less powerful themselves (250 & 350 w typical). Due to the mechanical gearing advantages involved by running the motor output through the bicycles gear train they are able to utilize smaller less powerful motors. Hub motors currently come in two flavors direct and geared applying the power directly a more powerful motor is needed due to the inability to change the gearing between the wheel and motor (500w+ typical). There are of course exceptions. There are a few two speed hub motors but to date not commercially widespread for various reasons, as well as very powerful (1000w +) mid drives. Both systems have advantages and disadvantages. In general most mid drives do not offer throttle. For most people without the need for outrageous hill climbing ability a hub motor works great. For off road users a mid drive offers a lot of advantages due to it's ability to handle aggressive hills simply by shifting into a lower mechanical gear. Some riders like the ability to utilize internal hub gearing and belt drive systems with mid drives too, however wear and tear on transmissions designed for human power is much greater. There are always new developments being explored too. Bafang has introduced a bottom bracket system which transmits its power to the wheel utilizing a shaft drive to a 8 speed internally geared rear hub, mainly marketed for the loan bike customers it's robustness and lack of maintenance may bring forth a new paradigm. As far as one of our sales staff not posting to the forum it does not surprise or disappoint me. Our volume of sales (thousands a year) and a small staff preclude most of us from participating in the forums. I was on hiatus from posting for a few years myself, a turn in my health is the only reason I find the time to participate now. While many of our customers have unlimited time and resources to research, debate and mull over even the smallest details of the few models they are interested in, time and resources will not allow us to do so. When a small LBS sells a couple of bikes a month they have the time to debate the merits of tapered spokes and grommets in rims, and their markups reflect that. Our customers expect the best pricing and the only way to achieve that without being a charity is to maintain volume. Unfortunately reality dictates there are only so many hours in a day or lifetime, I gave up being disappointed that others don't spend theirs following my passions. I may be way off base here and probably just rambling now so will follow my doctors advice and actually rest a bit...Keep rolling Rich

16 hours ago

Thanks for the sanity check...I agree, total BS but I wanted a second opinion.

I thought of just changing the tires for 622-50 big bens and I might still do this eventually for my 622 rims for fun. As of now I’m completely sold on the 584-60 supermoto x’s. I had a ride this morning and I am so amazed at how these tires have completely transformed the bike. 30psi they are so smooth, comfortable and surprisingly fast for such chunky looking tires.

18 hours ago

Quite honestly that calibration argument is BS. If these motors didn't have internal protection I may have bought that (still wouldn't).

The only reason that comes to mind is the obvious speed limit problem since the controller needs the circumference on top of speed sensor input to calculate actual speed. So by changing rims you can potentially "fool" the system.

If I were you though I would just change the tires. I don't know what model your haibike is but even I am considering going for 622x55-60 for my Xduro Cross.

1 day ago

Congrats! I got a black step-thru a few months back and really love it. Got some Dutch flowery panniers and am considering a different handlebar that sweeps back more. When comparing the features I wanted (internal hub, mid motor, Bosch, commonly available battery, lights, etc) the Townie Go! couldn’t be beat.

1 day ago

Nice to see those new Australian AVE brand step-through ebikes, their https://news.avebikes.com/blog/ave-launches-the-first-made-in-australia-electric-bike talks about exporting them to the US and Europe later in 2018. It will be interesting to see how the Panasonic mid-drive motor on the AVE TH9 model is received by the US market, one of the step-through's posted upthread the Panasonic ViVi is a typical Japanese market city ebike using one of their earlier mid-drive motors that continues to be sold in Europe. According to a https://news.panasonic.com/jp/press/data/2017/07/jn170704-1/jn170704-1.html the strength of the European market persuaded Panasonic to develop a https://eu.industrial.panasonic.com/products/e-bike-systems/center-unit-system#rear%20mount%20motor%20unit for their new http://cycle.panasonic.jp/special/xm1/#power - the publicity for that ebike talks about an optimized cadence of 70-100rpm, and a 36v 250w rated motor. The AVE TH9 model https://avebikes.com/shop-e-bikes/city.html/ talks about using "the latest X0 e-bike system...with 80Nm torque" which contrasts with the 60Nm torque of the previous generation motor so presumably means the AVE TH9 uses the new motor. The publicity https://avebikes.com/pub/media/catalog/product/cache//beff4985b56e3afdbeabfc89641a4582/m/i/mid-drive-motor.png appears to show the (confusingly named) 'rear mount motor unit' variant of the Panasonic mid-drive motor.

Chic Lasser
1 day ago

Really, 40% markup is barely enough to make a go at a retail business. Your dreaming on the ski markup your numbers are from the 60’s. In today’s, ski business dealers make 40% on map pricing, maybe a touch more if big buyers but few shops sell all their inventory at MAP pricing so when discounts are figured in maybe mid 30’s to high 30’s if their lucky. The internet has taken a toal on retail business.

2 days ago

I understand that they are pedelec 15mph.

They are 2 driving styles.

600 dollars is a lot of money difference.

Option 1

Extend the range or increase the total number of miles.

You can buy a second yamaha battery and have 1400 charge cycles.

1400/365 days= 3,8 years.....lot millas.

2600 dollars / 4 years/1460 days =cost 1,78 dollars day + more battery recharge=

2 dollars a day, if you exhaust all the miles per load battery.

Option 2

Legalization with the regulation of road circulation+be able to use day and night+accessories + speed unlocking

White and red light connected to the controller + external light for emergencies.


Option unlocked speed to 21/28 mph.

Buy gloves, waterproof clothing, seat more suitable for your body.

That would be 600 dollars more in Como 2.0.

I do not know if you can unlock speed in Como 2.0.

In Usa they have Christmas all year long .....

Congratulations for those prices

2 days ago

Both of my bikes are covered for 348 a year no deductible. A little insurance trick is to call the local people.

John from Connecticut
2 days ago

Hello KeithD, As mentioned prior, I get the whole research thing ( I'm a techie ) , but buying an e-bike isn't a science project and I don't mean that unkindly... Reading these forums, polling folks for their opinion is fun, informative, but it shouldn't be the driving force in making a decision. I get the sense it is or at least is a major component in the decision making process. To me an e-bike is personal based on ones needs, desires, budget etc. and not anonymous 'data' A thought, there is no perfect e-bike, it hasn't been built yet.

Key points in making a decision. $$$, style and type of riding which should dictate the type bike, dealing with a LBS or purchase via Internet.
Based on your posts I think you'd be best served buying from a LBS....Good luck.

John from CT

2 days ago

Sounds like Honolulu. Lock your bike outside the entrance to any store and it'll be gone before the saddle cools. In this https://youtu.be/5zOAQOv4FuI of one homeless camp in Honolulu, note the pile of bicycles at the 6-second mark. I can guarantee you that when the area was finally swept of the camps, not a single bike was checked to see if it was stolen before it was chucked into the waste truck.

3 years ago

I like thumb throttles as they are easier to use with gloves on.   Does this bike have a cruise control?

3 years ago

+nebula722 Very interesting, this is great feedback that might help others to consider what it's like riding an ebike and how to use this feature. Definitely makes me think differently about the feature. Thanks!

3 years ago

+ElectricBikeReview.com I set the cruise control at a speed a little lower than I want to go and then I pedal and add some speed to it.  This is really a power lock as it does not apply more power on a hill.  I leave the cruise set where it is and downshift till I can make it up the hill.  I use it as soon as I turn out of my driveway and I use it often.  With the cruise on I pedal as hard or soft as I want.  Perhaps this is a feature seniors will use more often than younger riders. 

3 years ago

+nebula722 I'm really glad you brought it up, most people don't think or talk about it but it sounds like you've found a good use for cruise control on ebikes. I'd like to hear how it comes in handy for you - when do you put it to use?

3 years ago

+ElectricBikeReview.com IZIP has a lot of interesting products.  When I purchased my Magic Pie with throttle and pedal assist I laughed when he told me of the cruise.  I use it constantly to my surprise. 

3 years ago

Great question! No cruise control here, I actually know of very few ebikes with that feature but many of the 2015 IZIP models will have it: http://electricbikereview.com/category/izip/

3 years ago

Do you really think the all four regen modes matter?
After riding the ST1 for over a year I still can't find any significance in the two modes it offers. It looks more like a gimmick than a significant feature.

1 year ago

I have a Tern Link D8 with a 250W Bionx, and I can say that I use all the regen modes. When you're going down a super steep hill, it makes it so that I hardly use my brakes plus it does put a decent amount of energy back for the short amount of time.

3 years ago

I wanted to do a comprehensive review of ST1 but stumbled on the issue of two regen modes, and even the tech support could not offer a reasonable explanation other than design features (in this case the wagon is ahead of the horse). Having said that I saw some designs with more significant energy return modes (forgot where). With regen modes being presents in many electric bikes, it is time to evaluate them and see who the winner is.

3 years ago

+wojtek1425 Great question, this is something I'd like to test but I haven't had the time to focus on it. Currently doing my best just to keep up with the site and add some new sorting features and reviews from Interbike :)

3 years ago

I know nothing about BionX, but wanted to know best case scenario percentage-wise. How much power can you possibly get back? I tried the ST1 but 1 bar was all I could get (long downhill coasting)

3 years ago

The four levels of assist and four levels of regen on BionX are pretty well spaced out. I could see myself using the first, second and third levels of regen when riding on flats or coasting down hills. The fourth level is pretty aggressive but I think they added it to balance out the four levels of assist. If they only had one level then it would likely feel too powerful and be less useful for actual fitness training or small hills... you'd have to pedal while going downhill vs. the very light regen level 1 that can actually still let you coast. I don't think it's a gimmick.

Marc Ariss
3 years ago

I try and I try to find something about folding bikes I like.....still no success, good review though.

3 years ago

Tern, like dahon, Brompton etc are a good frame to build an ebike on. More integrated battery solutions, integrated motor solutions, & disk brakes, a minimum.

3 years ago

Very nice. 

Way over my budget though. 

There's a bike called the "Cyclomatic folding bike" which is similar to this but is about £500 (or less). 

It's obviously not as nice as this bike, but would you recommend it anyway?

3 years ago

Interesting... I've reviewed a very similar bike to this called the EG Vienna http://electricbikereview.com/eg/vienna-250-ex/ and thought it was decent. I liked the suspension elements but felt the body position was more squished. Could be good for a shorter rider. The battery and motor size is also significantly smaller and the bike doesn't have regen. It's a trade off but yeah, those bikes seem to work alright :)