BionX S-350 Review

Bionx S 350 Electric Bike Kit Review 1
Bionx S 350 Electric Bike Kit
Bionx S 350 Gearless Hub Motor
Bionx S 350 Dx Battery Pack
Bionx S 350 Console Display Buttons
Bionx S 350 Display Panel
Bionx S 350 Hub From Above
Bionx Flier Page 1 1
Bionx Flier Page 2
Bionx S 350 Electric Bike Kit Review 1
Bionx S 350 Electric Bike Kit
Bionx S 350 Gearless Hub Motor
Bionx S 350 Dx Battery Pack
Bionx S 350 Console Display Buttons
Bionx S 350 Display Panel
Bionx S 350 Hub From Above
Bionx Flier Page 1 1
Bionx Flier Page 2

Summary

  • Versatile electric bike conversion set with four levels of assist, four levels of regen and throttle mode
  • Available with five battery pack configurations including two rear mount and three downtube mounted
  • Deep Sleep mode protects cells when system goes unused for extended periods (2 months or 2 weeks if < 10% charge)
  • LCD display is backlit, removable and symmetrical for use on right or left handle, also includes external button pad

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Video Review

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Introduction

Make:

BionX

Model:

S-350

Price:

$2,099 USD

Suggested Use:

Urban

Electric Bike Class:

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

Warranty:

2 Year Covering Manufacturer Defects (1,000 Charge Cycles)

Availability:

United States, Canada, Germany, Austria, Switzerland, Australia, UAE, India, Columbia, Mexico, South Korea

Model Year:

20142015

Bicycle Details

Total Weight:

17 lbs (7.71 kg) (Motor, Battery, Display, Button Pad and Controller)

Battery Weight:

8 lbs (3.62 kg)

Motor Weight:

9 lbs (4.08 kg)

Gearing Details:

10 Compatible with 8, 9 and 10 Speed Cassettes

Brake Details:

Magnetic Sensor to Cut Power and Activate Regenerative Braking (Attaches to Stock Brake Levers)

Wheel Sizes:

20 in (50.8cm)26 in (66.04cm)28 in (71.12cm)

Other:

Comes Spoked Into Multiple Wheel Sizes (700c, 26", and 20"), 6 Volt DC Output, Removable Battery Charges on or off Frame, Spokes Come in Silver or Black, Rear Rack Battery Option has a Built in Light, Motor Locks for Security when Display is Removed, Deep Sleep Protects Battery from Discharge Damage After Two Months (Or Two Weeks at < 10%) of Inactivity

Electronic Details

Motor Brand:

BionX

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:

Panasonic

Battery Voltage:

48 volts

Battery Amp Hours:

8.8 ah (Also Available in 6.6, or 11.5 ah)

Battery Watt Hours:

423 wh

Battery Chemistry:

Lithium Manganese Cobalt

Charge Time:

4.5 hours

Estimated Min Range:

50 miles (80 km)

Estimated Max Range:

75 miles (121 km)

Display Type:

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

Readouts:

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)

Drive Mode:

Torque Sensing Pedal Assist, Trigger Throttle

Top Speed:

20 mph (32 kph) (Unless Otherwise Specified in Specific Jurisdictions)

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Written Review

The BionX S 350 electric bike conversion kit includes a light weight, gearless hub motor designed for rear-wheel use, an LCD display panel and button pad as well as a battery pack of your choosing. It’s one of the most polished, flexible and sophisticated ebike kits around and offers everything from pedal assist to throttle, regeneration mode and regenerative braking. This kit resembles the older SL 350 which was produced through 2014. BionX has been shortening their naming conventions to make the space less confusing and that’s where the S comes from. This kit in particular is really their bread and butter and thanks to the five battery options it will offer you weight savings, increased range or power. You also get to choose from a rear-rack design or a downtube mounted setup.

The motor included with this kit offers 350 watts of power in a high torque configuration. It delivers up to 29.5 lb.-ft (40.0 Nm) of torque with nominal output of 6.6 lb.-ft (9.0 Nm). That’s pretty good considering its relatively small visual footprint and weight (the SL and S series from BionX weigh roughly 2.5 pounds less than the earlier PL 350 series). I like the new wavy design on the hub casing and have long been a fan of the near-silent operation of these gearless kits. This motor activates very smoothly, relying on a torque sensor built right into the hub. In order to make it go you just turn on the unit, choose an assist level and begin pedaling. Alternatively, you an use the variable-speed trigger throttle but the bike must be going at least two miles per hour for this to work (the minimum speed requirement is a safety feature).

Being gearless, the S 350 motor relies on powerful magnets inside to drive the bike forward. These tend to last longer than plastic gears used on geared hubs. The magnets also enable regeneration riding modes that will help to slow you down when descending hills or provide an added challenge when pedaling on flats in a sort of “workout mode”. There is also a standard regenerative braking trigger that activates when you pull the right brake lever. The downsides of gearless direct drive systems like this are increased weight and some cogging when the system is not actively assisting. Cogging happens when the magnets inside the motor pass the stater (a metal rod that becomes magnetized as electricity flows through) and repel it as shown in the video review. While cogging can’t really be helped, BionX has done a great job of reducing its affect on the ride quality of their kits. One area they could improve however is by offering two regenerative brake sensors or an option for complete ebike specific brake levers. Tektro makes some great levers that are included with other kits but the downside of this is that they only work with mechanical brakes (not hydraulic) and may be of a lower quality than the levers your bike already has… and having an extra set of levers also creates waste.

The battery pack options for the BionX S350 are plentiful and possibly confusing. Let’s break it down in a second but first off, it’s worth mentioning that all packs use Lithium Manganese Cobalt cells by Panasonic. These are light weight, durable and warrantied for two years. All packs also include the Deep Sleep system which automatically cuts all power draw after two months (or two weeks if the battery is lower than 10%) of inactivity, helping to prevent damage. Now, which pack to get? There are three size designations including L (Large) XL (Extra Large) and VL (Very Large). There are also two types of mounting options including D (Downtube) and R (Rear). So when you mix the letters together you get the following rear rack options: S 350 RL (rear mounted large 48v 6.6ah) and S 350 RX (rear mounted extra large 48v 8.8ah).

And you get the following downtube options: S 350 DL (downtube mounted large 48v 6.6ah), S 350 DX (downtube mounted extra large 48v 8.8ah) and S 350 DV (down tube mounted very large 48v 11.5ah). Simple right? Please note that the images above aren’t perfect, while they do show BionX rear-mounted battery packs they don’t show the latest decals which are black and show little bars (like a bar chart) from left to right. The Large pack has one bar, the Extra Large pack has two and the Very Large pack has three (the goal is to make it easier to understand the whole size thing, more bars = more juice inside). Okay, back to the review… My preference is for the downtube mounted packs because they keep weight low and center to the bike but they also take up the spot where a water bottle cage might otherwise go. Since the hub motor is already mounted at the rear of the bike, having a heavy rack there as well is not ideal. One thing I do like about the rear packs however is the inclusion of a built in LED light for safety.

The second generation (G2) display panel used on this and other BionX kits is quite good. It’s large and easy to read, backlit for use at night and symmetrical for easier use by left and right handed riders. There are two buttons on each side of the display which activate the unit and allow you to choose from one of four regen modes, zero mode or four levels of assist. You can operate the system just fine from this main panel but BionX also includes a stand alone button pad that can be mounted extremely close to grips and brake levers for even easier access when riding. This pad includes a + and – button (for navigating assist levels) as well as a red variable-speed trigger throttle which can activate the motor without pedaling. It’s a beautiful design and so thoughtfully constructed that it works with all kinds of bicycle cockpit setups, not just standard flat bars. Even with the recumbent trike shown in the image below, which has vertical handle bars, the button pad works great and the LCD display panel is still visible mounted front and center. In addition to being easy to use, the display panel is also removable so you can keep it safe from weather, tampering and vandalism. Awesome.

BionX was started in 2000 as EPS (Electric Propulsion Systems) and was acquired by Magna (a Canadian automotive company) around 2008. Since then it has grown into one of the largest, most trusted high-end manufacturers of drive systems for electric bicycles in the world. The S 350 is their workhorse kit that is sold directly to shops (for install on end user bicycles) and OEM manufacturers like OHM, Yuba, Xtracycle and Smart. It’s a great setup and one of the best options for people who have a beloved or unique bicycle that they want to convert to electric. The kit is available in a wide range of wheel sizes including 20″, 26″ and 700C and can also be configured to power third party lighting systems.

Pros:

  • Lightweight, redesigned hub motor is 2.5 lbs lighter and more stylish than older PL 350 models
  • 48 volt battery system is more efficient and thus, longer lasting than older 36 volt BionX systems
  • Works with almost any bike, including those with smaller wheel diameters like folding bikes and recumbents
  • Both battery configurations (rear rack or downtube) lock to the frame for security and can be charged on or off of the bike
  • Gearless hub motor runs smooth and quiet, has built in torque sensing and regenerative braking
  • Rear-wheel hub motor exerts force onto the part of the frame that is designed to handle it vs. front hub designs, great if used on bicycles that have front suspension forks
  • Works with disc brake setups as well as v-brakes and isn’t too wide to accommodate a cassette

Cons:

  • Installation is a bit complicated, BionX sells directly through shops who will handle it for you or as a built in option on OEM electric bikes
  • If purchased as an add-on kit the wires and cables won’t be integrated into the frame which might not look as nice as a purpose-built ebike
  • Trade offs in how you mount the battery: rear rack is heavier and unbalanced, mid mount takes water bottle spot
  • this is one of the most expensive electric bike conversion kits around but also one of the best with many options and a solid warranty
  • Throttle and computer may not mount as easily to road bikes with drop handle bars due to shape and size of tubes and grip tape
  • This kit is only compatible with 135 mm axle size so check your mountain bikes carefully or bikes with thru axles

Resources:

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Jean Guy
3 years ago

Bonjour,j’ai un tandem Norco Duo Alu 6061,suspension avant frein V,hybride,26” ,24 vitesse,pneu Nimbus (pas de crevaison)Il est comme moi pas jeune,mais c’est une bonne machine selon moi.Il a environ 10 ans et 10000 klm.Je voudrais le convertir avec le kit S 350 DV.Je voudrais faire environ 80 a 130 klm par utilisation assisté et pas beaucoup de grosses pentes.Les 2 personnes et notre matériel a part le velo font 275 a 300 livres. Après avoir lu les infos sur internets,j’ai pensé que le S 350 DV serait mon meilleurs option.On n’est agé de 70 ans et nos jambes sont plus faibles. J’aimerais avoir votre opinion si vous avez du temps. Merci Jean Guy Je suis de Montréal Qc Canada

Reply
Court Rye
3 years ago

Neat ! Il semble que votre vélo est un tandem ( je l’ai fait une recherche d’image en utilisant Google ) . Je crois que l’un de ces systèmes BionX pourrait fonctionner , y compris la S 350. Le seul domaine où vous pourriez avoir besoin pour personnaliser un peu est avec le montage de la batterie, panneau d’affichage et la gâchette . Les fils pour faire ce travail pourraient avoir besoin d’ être étendu afin qu’ils puissent atteindre tout le chemin du retour vers le moteur . Sinon, vous pouvez obtenir une trousse de roue avant qui exigerait un câble beaucoup plus courte . Un système qui pourrait fonctionner pour cela est la Dillenger 350 Geared car il utilise également un tube diagonal batterie montée qui prendrait la place de votre bouteille d’eau sur le tube diagonal avant :)

Reply
Joe
2 years ago

Can i ask what was used to mount the battery to the tube of the recumbent trike as most of them do not have a water bottle mount in that position?

Reply
Court Rye
2 years ago

Great question Joe! On the second to last picture here you can see this wrap-around metal adapter thing that sort of resembles a bottle cage adapter but is fit for a larger tube. I’ll do some searching and ask BionX for you to see if we can figure out how to get one ;)

Reply
Court Rye
2 years ago

Hi Joe, I just heard back from BionX and they said “The harness on the bike in the video is attached to the boom arm clamp with a special bottle cage mounting bracket that was supplied by Catrike, it’s a stock part for their recumbent bikes.”

Reply
Joe
2 years ago

Thanks just wondering as trying to figure out how i can mount my battery on the boom instead of on rack where i have it. Its not a bionex one but uses a water bottle mount bracket so will look into that one from catrike see if it will work thanks.

Reply
Court Rye
2 years ago

Cool, yeah this would be a neat accessory if it was sold separately. I do see a few bottle cage brackets on Amazon like this one but they don’t look especially strong (or like they’d fit the larger tube diameter like the Catrike uses).

Reply
Joe
2 years ago

hmm doesn’t look like its available as an accessory so only comes with catrike damn :)

Reply
Joe
2 years ago

Yeah I woldn’t trust anything like that one to hold a battery that and no they won’t fit on the larger tubes anyway. I guess i could look into the one tcycle makes but not sure if it will work with water bottle mount but i guess i can contact them and ask etc :) You would think someone would make something like this though for trikes since way better then using the rack which is where mine is atm.

Reply
Court Rye
2 years ago

I’m not sure if you have experience with manufacturing and design but maybe this is the perfect niche market to go after as an entrepreneur? You’re probably not the only one looking for a sturdy adjustable bottle cage that would work with recumbent bikes. You could also try to make just one for yourself at a TechShop or other DIY space.

Reply

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Start a new s 350 thread on the BionX Forum page

valveman12
7 months ago

That motor is really quiet.

Dale Wildey
12 months ago

That motor is very quiet. That's important when your riding position puts your head close to the rear wheel. Also stealthy for trail riding. Thanks for the video

Zachary Mohrmann
1 year ago

What a weenie...!

Noelle Hoppe
2 years ago

how much does this cost? where are they sold? who does aftermarket? would this work on my Sun Easy Tri Classic? how long do they last? what kind of warranty is there? I would like to know???

Ben Ling
2 years ago

Off topic here, but did you try any sharp turns on the Catrike? I like the general feel of their trikes, but I find that their direct steering gets stuck when turning sharply. It feels like they need to change the angle of their head tubes. A KMX I've ridden, also with direct steering, did not have the same problem. Thank you for these videos!

bentstrider
2 years ago

I've got an Expedition as well.
This seems pretty good for when I've got to pull my 70lb sound system up the hills in ABQ.

Tempting.

nebula722
3 years ago

I have two additional comments. and one question  1)  I love the shave club advertisement prior to the video, very funny.  2)  I have a Golden Motors 29" 1000 watt gearless rear hub motor and it keeps breaking spokes.    I believe it is because the kit is a lower priced kit and the spokes are too long.  I have a 26" kit and it does not breaks spokes.  When are you doing a review on Golden Motors.  Good morning.

nebula722
3 years ago

+ElectricBikeReview.com The spoke nuts are coming off the spoke!  How is that happening?   I am 100 miles  (almost exactly) north of HPC.  I live in Bakersfield.  There is a Golden Motors dealer in Bakersfield which also sells two and four seat quad cycles.  I am sure he would welcome you.  You can test drive my bikes anytime you want.  they would be a good comparison to all the factory bikes you review.

ElectricBikeReview.com
3 years ago

Hmm, I've heard of some other bikes breaking spokes as well. Might need thicker gauge or eyelets and better fasteners or something, some lock tite could help if they are coming loose but if they are just snapping then it sounds like they aren't strong enough. I'd like to review a Golden Motors system, just have to find one in real life! Where are you at again? Maybe I can test ride yours :P

nebula722
3 years ago

I know you put in a lot of work in all of these videos so thank you for your effort but how fun is it to ride all of these Ebikes and Etrikes?   Trikes are cool.

nebula722
3 years ago

+ElectricBikeReview.com
I will be watching!

ElectricBikeReview.com
3 years ago

+nebula722 Thanks! More reviews on the way... heading to California next month to see the new IZIP, Haibike, Easy Motion and Pedego stuff :)

nebula722
3 years ago

+Electric Bike Review I think it must be fun.  FYI I have posted under the name of Zed in the past.  I am having fun watching your videos and the videos of people riding their trikes in foreign countries.  I appreciate your efforts.

ElectricBikeReview.com
3 years ago

Ha! Yeah... it's pretty awesome to see the new stuff and I speak directly with shop owners and sometimes the actual product managers and management teams at ebike companies so I've learned a lot and I try to pass that on while also providing honest feedback. The recumbent trike design is very cool and more efficient than upright bikes due to the aerodynamic nature of reduced frontal surface area.

Zed Bowman
3 years ago

I enjoy watching your reviews..I have a Terra Trike Rambler 24 speed.  I equipped it with a Golden Motor 1000 watt 29" wheel kit powered by a 48 volt battery.  The kit came with throttle control with cruise control.  Due to neurological damage I no longer drive and this Etrike and my Ebike keep me mobile.  My Terra Trike is not very stable going around corners otherwise I enjoy my Terra Trike.  I even attach an InStep trailer and take the dog on rides.

Taggerung
3 years ago

I'm back into my 'decision' stage, between the "Bafang-8fun" mid-drive, and the "BionX S 350 DL" do you have ANY suggestions or ideas that may help? I like good customer service, and I know "BionX" is sorely lacking in that department, still I know "BionX" has 'regenerative braking' and "Bafang" does'nt. I also have many steep hills where I live. Any theories, ideas, or opinions? Help!

cartmanrlsusall
5 months ago

ride the trike while you talk its annoying,you only ride for 1 minute and talk 15

Taggerung
3 years ago

+Electric Bike Review Thank you. 

ElectricBikeReview.com
3 years ago

+Taggerung No worries :)

Taggerung
3 years ago

+Electric Bike Review Sorry to ask such a silly question. The answer was on the review you linked to. So I was right in saying it was in your review, and I just missed it. 

ElectricBikeReview.com
3 years ago

+Taggerung I'm less familiar with their battery pricing to be honest. They have several sizes which are listed back in the full review here: http://electricbikereview.com/bionx/d-500/ and the v is the top end which stands for very large :)

Freddy Ulvseth
3 years ago

Hi, that mount for the throttle at 2:32, is that a part that cam be bought sepratly or was it there? I have anbike almost like that and that throttle mount was something for me :-)

ElectricBikeReview.com
3 years ago

+Freddy Ulvseth Awesome, I hope you get an answer because I'm curious as well :)

Freddy Ulvseth
3 years ago

Great, perfect.. Thank you.. I´ll email them on that adress :-)
I will let you know if we find that part ;)

Best regards
Freddy.

ElectricBikeReview.com
3 years ago

+Freddy Ulvseth Hi again Freddy, I just emailed a contact at BionX and they provided this address to use for asking your question about the display panel: service.bike.na@ridebionx.com I'd love to hear what they say when you reach them!

ElectricBikeReview.com
3 years ago

+Freddy Ulvseth Hmm... I wish I would have looked more closely. I'd suggest reaching out to BionX and including a link to this video. Just explain that you're looking for a solution to mounting the throttle as you see here, maybe also send this email to me using the EBR contact form back at the site and I can forward it to try and get some attention from their lead tech.

Freddy Ulvseth
3 years ago

ok, mine was delivereds with no mounting holder, I could thread it onto the handle bars, but yours seems to have a 90 degree fixing under the gear handler where the throttle is mounted.. ;)

John Zoccano
3 years ago

Sorry but i thought id point out something...i heard the spokes "ping" as you were driving..either they were loose or just not strong enough...

ElectricBikeReview.com
3 years ago

I think that might have been the disc brake rotor touching the pads as I increased speed and strained the frame.

John Zoccano
3 years ago

How much is the kit?...i find BionX very expensive..

ElectricBikeReview.com
3 years ago

Hi John, I post prices back in the reviews (since it's easier to keep updated there) and I link to them from the description of each video. You're correct that BionX tend to be more expensive. The S 350 kit ranges from $1,999 to $2,500 depending on the battery pack configuration you choose: http://electricbikereview.com/bionx/s-350/

Mister Evergreen
3 years ago

Fukking nice cuzzin !

ElectricBikeReview.com
3 years ago

I agree, this is a pretty sweet setup... Recumbent bikes are tons of fun.

Ali Alsouaijet
3 years ago

How many bikes do you have

ElectricBikeReview.com
3 years ago

+Ali Alsouaijet Sure thing, doing my best out here. Always appreciate the feedback and support!

Ali Alsouaijet
3 years ago

Cool and thx keep up the great videos:)))

ElectricBikeReview.com
3 years ago

Hi Ali, I personally own one electric bike. The way I get all of these reviews is by traveling around to conferences and bike shops. I tried this kit in Toronto Canada at the BionX headquarters earlier this year :)