BionX P-350 Review

Bionx P 350 Electric Bike Kit Review 1
Surley Pugsley Bionx Pl 350
Surley Pugsley Bionx Pl 350 Dd Motor
Surley Pugsley Bionx Pl 350 48v Battery
Surley Pugsley Bionx Pl 350 Display Panel
Surley Pugsley Bionx Pl 350 Throttle Control
Surley Pugsley Bionx Pl 350 Disc Brake
Surley Pugsley Bionx Pl 350 Cassette
Bionx P 350 Electric Bike Kit Review 1
Surley Pugsley Bionx Pl 350
Surley Pugsley Bionx Pl 350 Dd Motor
Surley Pugsley Bionx Pl 350 48v Battery
Surley Pugsley Bionx Pl 350 Display Panel
Surley Pugsley Bionx Pl 350 Throttle Control
Surley Pugsley Bionx Pl 350 Disc Brake
Surley Pugsley Bionx Pl 350 Cassette


  • A more affordable, less powerful electric drive kit from BionX with rear-mount battery design only
  • G2 console offers four levels of assist, four levels of regen and throttle mode with break-out button pad
  • 36 volt system is less powerful than the S 350 series which uses 48 volts but still capable and reliable

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Video Review

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$1,799 USD

Suggested Use:


Electric Bike Class:

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


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


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

Model Year:


Bicycle Details

Total Weight:

14 lbs (6.35 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)24 in (60.96cm)26 in (66.04cm)28 in (71.12cm)


Comes Spoked Into Multiple Wheel Sizes (700c, 26", 24" and 20"), Removable Battery Charges on or off Frame, 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:


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:

37 volts

Battery Amp Hours:

6.4 ah

Battery Watt Hours:

237 wh

Battery Chemistry:

Lithium Manganese Cobalt

Charge Time:

4.5 hours

Estimated Min Range:

25 miles (40 km)

Estimated Max Range:

35 miles (56 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)

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 P 350 electric bike kit is the only system with a ~36 volt configuration being offered by BionX for the 2015 model year. All other kits are running at 48 volts which offers more power, efficiency and range. The P designation is a shorter version of PL which was used on the PL 350 and PL 250 in earlier years. In short, what you’re getting is basically the new motor design (which is 2.5 pounds lighter than the old ones) running at a lower voltage. All in all, it’s an excellent system but you’ll be limited to the rear-rack battery style which doesn’t keep weight as low and balanced on the frame. If you can’t afford one of the newer S 350 BionX kits or just don’t need the power then this could be an excellent option.

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) which is pretty good. 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 choose an assist level and begin pedaling. Alternatively, you can use the variable-speed trigger throttle but the bike must be going at least two miles per hour in order for it to activate. Being gearless, the P 350 motor relies on powerful magnets inside that tend to last longer than plastic gears. These magnets enable regeneration riding modes which slow you down when descending hills or provide an added challenge when pedaling on flats. There is also a standard regenerative braking trigger that activates when you pull the right brake lever. The downsides of gearless direct drive are increased weight and some cogging when the system is not actively assisting.

There is only battery pack option for the BionX p350 which is a 37 volt 6.4 amp hour rear-rack design. Please note that the images shown here and in the video portray a mid-mount pack which is incorrect. The kit I was testing used a prototype P 350 motor and DX battery from another kit, sorry for the confusion. Just look at the main image at the top of this review for a more accurate protrayal. My preference is for the downtube mounted packs because they keep weight low and center to the bike but given the lower price and reduced weight of the P 350 the rear rack design is fine and it even includes an LED tail light. The battery itself locks to the frame but is removable for convenient storage and charging. The cells use Lithium-ion chemistry that is light weight and durable for 1,000+ charge cycles and BionX offers a 2 year warranty standard.

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 mentioned above 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. In addition to being easy to use, the display panel is also removable so you can keep it safe from weather, tampering and vandalism.

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 P 350 is a unique model because it basically uses the S 350 motor and runs it at a lower voltage. Sure, you get a limited sized battery that can only be mounted to the rear end of a bike but it still works great. It kind of reminds me of video game consoles that play the same games but get new updated hardware that is smaller and lighter after every couple of years… You get the same PL 350 performance but it’s lighter and better looking this time around. 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. To get it installed on your bike you’ll need to work with a local shop who can order direct from BionX.


  • Lightweight, redesigned hub motor is 2.5 lbs lighter and more stylish than older PL 350 models
  • Works with most standard bicycle, including those with smaller wheel diameters like folding bikes and recumbents
  • The battery pack locks 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
  • This is one of the most affordable BionX kits available, you still benefit from a high quality system just operating at lower power with decreased range


  • 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 than a downtube design
  • 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


More BionX Reviews

BionX D-500 Review

  • MSRP: $2,499
  • MODEL YEAR: 2015, 2016

Top of the line 500 watt electric bike kit with a focus on acceleration and low end torque for climbing. Unique center-spoked design for improved comfort and wheel durability, narrow casing accommodates a larger cassette…...

BionX S-350 Review

  • MSRP: $2,099
  • MODEL YEAR: 2014, 2015

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...

BionX SL 350 Review

  • MSRP: $1,999
  • MODEL YEAR: 2013

Top of the line kit, 350 watt motor is ~2.5 lbs lighter than the older PL 350 model, includes advanced security features. Available in two designs to fit most bikes: mount to down tube or integrated into…...

BionX PL 350 Review

  • MSRP: $1,499
  • MODEL YEAR: 2013

A line of three 350 watt, 37 volt electric bike conversion kits. Available in mid-frame or rear rack styles to fit just about any bike...

BionX PL 250 Review

  • MSRP: $1,199
  • MODEL YEAR: 2013

One of the lightest electric bike conversion kits available anywhere, just 7.3kg (16.1 lbs). Mounts to water bottle eyelets on downtube of, distributes weight evenly front to rear...

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1 day ago

It cost me about $140 to have a bare hub motor (Bafang) shipped from China, and $60 of that was for the shipping. It would be over $250 with a wheel, so I just buy better spokes and a rim and lace them myself. Unless it's proprietary like Bionx, hub motors are interchangeable.

A reseller/importer like Juiced can get those replacements for far less, but they gotta make their margins, and so does a bike shop, so a replacement could be spendy.

Bosch and Yamaha mid drives ...I would expect to be double spendy.

I might have around 2200 miles on my ebikes in 2.5 years of ownership. Three bafang motors, and several unknown names. I don't abuse them, and haven't any failures with the motor or electronics. More importantly, the batteries seem to behave.

1 week ago


1 week ago

Some nice cargo ebikes there, a friend just ordered a Riese & Muller Packster 60 and from what I've read it can be a true car replacement. I'd be wary of getting a Bionx converted cargo bike because they have gone into receivership and used a proprietary system so batteries and parts may be hard to get in future. To be fair the 2018 Rad Power bikes use a custom battery case which can't be swapped out for a generic replacement but at least those can be with new cells unlike a Bionx battery.

2 weeks ago

The ebike situation is like the wild west or the early days of motorcycling, it seems everyone and their dog is building an e bike. I have a BionX system and there is no way i was ever going to pay the price they wanted for a replacement battery. It did work well and continues to work well but I foresee a HD500 wall ornament on my garage wall at some point in the future. Grin technologies is looking like they will be getting my money next time

Go Time Electric Bikes
2 weeks ago

Yes we hope so...It is a great system

2 weeks ago

Interesting; I thought, A2B was a trademark of UltraMotor. Then it seems as Ultra Motor ran into bankruptcy, their business was taken over by TDCM. The firmware used by UltraMotor made me the impression to be a legacy of the BionX firmware. In the beginning, Stromer used such firmware.

So, a non-Stromer replacement motor could work with the Stromer display unit (because the 36V battery is free accessible). Does this fit with your experiences?

86 and still kicking
2 weeks ago

Will do, we sell both Ohm and Elby and would just hate to see this tech disappear. Not sure how many folks have ridden the D500 system but the smoothness, power, diagnostic and configuration capability, and durability of the system is top tier tech.

My feeling is that someone will step in to purchase certain assets and maintain production of these motors.

2 weeks ago

Hi 86,
If you or your contacts hear anymore re a possible Bionx-Boinx bailout could you please keep the forums posted
I know a few Bionx owners who will be relived if the rumours are substantiated

86 and still kicking
2 weeks ago

Bionx Europe is still up and running and we expect the Bionx tech to be purchased and continue. My contacts at Elby (another Bionx bike) seem to know something we do not as they are business as usual.

2 weeks ago

Uh-Ohm ; BionX filed for bankruptcy !

Ravi Kempaiah
2 weeks ago

One of the documents noted... BionX owes $21 Million...
That is some massive debt to be resolved.

General Ike
10 months ago

I was trying to use a different battery to power my old Bionx bike, but in the process, I'm pretty sure I accidentally connected the negative and positive ends of the battery in reverse, being the careless fool that I am. Now the bike doesn't run at all, even with the proper battery. What exactly happened? Is everything completely fried? Are there only some things I need to replace?

The bike was one these four models, but I don't know which: P-250, PL-250, P-350, PL-350. One of the older models if I'm not mistaken.

Allen Janes
1 year ago

do they make the kit far a KHS 1000 fat bike?

Slippschitts Hey
2 years ago

Is it a fat tire bike or is it sort of a fat tire bike?

Peter Peter
2 years ago

Hi, great review, but if you could, could you tell what the average range on this is. Ive checked this info online but i would like to know the actual numbers tested in real conditions. Thanks dude

Jerk Johnson
2 years ago

These look like the smartest electric-bikes I've seen yet, with their chubby tires and their ability to simplify things by eliminating heavy shock absorbing hardware to the bike. Excellent, guys! I'll be looking for one of these under my Christmas tree this A double thumbs-up! :-)

2 years ago

great video! thanks man that was awesome! keep up the great work

Johnny Twothumb
3 years ago

Dude, love your work!
So helpful with your reviews!
I have a pugsley and am tossing up putting the bionx on it or buying the easy motion evo cross.
I need to commute 8km each way so im not sure...

3 years ago

I like the kit a lot but I hate the two mph requirement for the system to function.  If I am going uphill on my trike with my trailer and need to take off again I may not have the strength to get going. Thanks for the info.

3 years ago
.Why isn't it offered as an option?   I think it could be because it is just hard on the power system to start from a dead stop.. BionX makes a great system, just disappointed it wouldn't  work for me,  The bottom line is it is their company and they can do whatever they want, Just sayin.
3 years ago

+nebula722 Right, but if you're a company that wants to avoid frivolous lawsuits these are the kinds of things you probably think about. Have you noticed that playgrounds in the US are starting to take out swings? Just too dangerous...

3 years ago I simply do not want a product that will not accelerate on demand.  I ride too many steep roads which renders this kit useless.  I respectfully disagree with the idea you can make the world safe.  I do believe in personal responsibility.  Simply don't give the keys to anyone not fit to ride. 

I was 13 when I learned to ride a Yamaha 80.
3 years ago

+nebula722 I think there can be an instinct that when you panic you grab the bar harder and tense up. This could either increase the throttle or keep it going even though you want to stop. The difference between an ebike and a motorcycle is that you don't need a license or insurance. Imagine a 13 year old kid who hasn't had the practice and education required for cars and motorcycles who might get on an ebike and struggle in a moment of panic. I think BionX is conservative because they want to build the space and promote safe systems.

3 years ago Why did they do it?  I don't even care for the brake handles that cut off the power.  They don't do that on motorcycles and it seems to me if you don't have the coordination to release the throttle when needed perhaps you should not be on a ebike.  I am not be sarcastic.

4 years ago

Good Review. Makes me wana tour & explore my deeper country (middle earth) Will this machine allow me to out pace Wogs ?
4 years ago

+vibe2light Awesome! I'm guessing you could only carry one or two with the Surly Pugsley conversion but quite a few more with the Urban Arrow ;)

4 years ago

+Electric Bike Review the South Island mountainess region and we like reckless speed opportunities but conducted in a responsible manner. So how many Hobbits do you think i could load & carry ?,,,i like to help them out with their quests if i happen accross them occasionally.
4 years ago

Cool! Glad you enjoyed the video, these fat tire style ebikes are tons of fun. Here's the full list that I've reviewed: more are on the way soon with Interbike happening this next week... and yeah, they go pretty fast on most terrain, usually up to 20mph in the USA and ~15mph in the UK. So are you in New Zealand then?