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Bafang BBS02 Mid Drive eBike KIT

$599.00 $400.00
(You save $199.00)
Calculated at checkout

Product Description

  • Upgraded controller with extra beefy 3077 mosfets to handle extra power
  • We offer a FREE programming of your firmware setting to turn your Bafang BBS02 into a hot rod
  • Affordable and powerful mid drive conversion kit
  • 25 amp upgraded mosfets controller  (up to 1300 watt with 52 volt battery)
  • Lightweight (~10 pounds) and very powerful
  • Turn almost any bike into a high-end mid drive ebike for very affordable price


Luna Cycle has proven itself to be the premier BBS02 dealer offering the best selection of kits with the best features at lower prices than you can find anywhere.


We cover most repair parts for all versions of the BBS02 past and future. 

This is the highest performance version of this drive with upgraded firmware (custom made for Luna Cycles) and a controller with upgraded 3077 mosfets designed to handle the higher power this upgraded firmware will give you. 

Do not let another USA dealer snow job you, there is no better or newer or faster BBS02 kit available.   

This price is for knowledgeable builders and people willing to do their homework before they buy.  If you fix things on your own bike and like tinkering then this kit is fine for you. It is a plug and play kit with everything you need except the battery and charger. If you have not installed an ebike kit on a bike before we recommend that you read the installation manual before you make the decision to buy this drive unit. 

We are an American company located in Southern California. Many other people who offer this type of pricing are in China and the problem with China is the shipping costs tend to be very high (around $80 for the drive unit and much more for batteries). If you think it's expensive to receive something sent from China, wait until you try to send something back to China. When you buy an ebike product from a non-reputable vendor in China you are basically getting it without a warranty. 

Regarding Controller and Firmware Hot Rod

Our kit includes a factory hotrodded controller different than most BBS02s purchased from China. The original BBS02 controller also had weak mosfets that would blow out easily when too much load was put on the system. We have had all our drives modified at the factory with more expensive and robust 3077 mosfets to make the controller handle more power without overheating. This makes it possible for us to change the firmware to a set up that allows you to utilize all peak 1300 watts this drive is capable of. We still recommend that you use a lot of common sense and keep your motor spinning fast by shifting down and keep your motor revving high when climbing. All electric motors prefer to spin at high rpms and you should keep this in mind and baby your bafang. We do not cover blown controllers under warranty. So if you overheat your controller by not following our operation guide, you will have to replace it. 

The way this kit comes from the manufacturer it is very solid and hard to burn out. It is also difficult to get the kit’s maximum 1300 watts of performance which you can do by upgrading the firmware. We sell our kits to experienced builders with the firmware already upgraded. (Click here for the firmware programming guide)

We recommend  you get the optional programming cable so you can tweak your own program settings. Their are many online guides which will help you do this. 


The Bbs02 is a better option over the bbshd in these cases:

when cost is a factor

when you do not  need the extra power the bbshd offers.

when you do not need extreme hill climbing power

when you want a lightweight build.

When you want your drive to be 100% street legal

Also check out the 1000w BBSHD if you want more power than the BBS02 offers.


Kit includes:  

  • Bafang mid drive motor 

  • 25 amp controller (built into drive system) with upgraded 3077 mosfets

  • Hot rod programmed for ultimate performance
  • Bottom bracket compatible with 68-73mm bottom brackets (most standard bikes)
  • Your choice of 44t  46t  48t  52t chain ring

  • Thumb throttle 

  • Ebrake handles  which cut off  the motor when depressed

  • C965 Display 


Read our complete review on this kit here

Watch ride video here


Which Bike?

The Bafang drive mounts in place of your current bike's bottom bracket and replaces your bike's crank set and front derailler if you have one. 

Your donor bike must have 68-73mm bottom bracket width. That means this kit will bolt onto almost any bicycle. But not fat bikes. We have the BBSHD which is 1000W nominal 1500W peak and will work with fat bikes 100-120mm bottom brackets (BBSHD located here).

Many people have found that the Bafang can actually be mounted to many types of trikes, which can be fun since many trikes are not good candidates for hub motor kits.


Maybe you have an old donor bike laying around you want to convert, or maybe you are wide open to which bike to buy and install this kit on.

If you are also shopping for a bike to install this kit, that is perfect. We recommend you pick a bike that is known to be compatible with this drive and has no known issues. Ideally a build report has been written on our builder forum so that you can follow step by step someone elses building steps.

Here is a post on our builders forum  with a picture  collection with links to  build reports you can quickly  scroll through. 



Which Options?

When you buy your drive the following info will help you pick which options are right for your bike.


Battery Options

This Kit includes everything you need to install the kit on most bikes except for battery and charger (which you can add at discounted price) all the batteries listed in the add as add ons are excellent choices for this kit.  We have picked our most popular batteries as kit options and have made them available at a discounted price.

However you are not stuck to just these choices. 

All of our 48v (see here) and 52v (see here) batteries are compatible with this kit as well if your looking for something larger in capacity. (more amp hours = larger size and farther range) 


Display Options

The displays  are our ebike dashboard and all of them display the same information (watts, battery indicator, speed, miles traveled, etc) so in essence just pick the display that you like the look of the most, since they all have the same basic functions. 


965- Standard display and recommend if you dont have a strong preference for something else.

DPC-14 A full color display (read more here)  that is a $45 upgrade option. If you want the fanciest best looking display this is it.

963- the smallest most discreet display...mounts by the throttle. A cult favorite. $40 upgrade price.

961 - The bafang default display that is not fancy but works perfect.


Sprocket Options:

We offer the Bafang with 3 different options for tooth count on the chainwheel.

46/48/52 tooth

Of course your gearing will also be determined by the rear cluster on the back of your bike. 

But you need to choose which of these 4 options you want up front.

46 tooth will give you the most reliable set up that is also very torquey and better for off road hill climbing.

48 tooth will give you the middle ground.

52 tooth will give you the highest top speed (30mph) but is only recommended for street riding and you should really take care not ot overheat your controller when running this high by keeping your motor spending fast. 

(Click here to read our special care & instructions guide here)


eBrake Options

The Bafang has the option of connecting with your bicycle brakes and automatically cutting off power when the brake is tapped.

The kit will work with or without the brake sensors plugged in.

The Bafang kit comes stock with new brake handles that can replace your existing brake handles.

You also have the option of getting magnet sensors which allows you to adapt your existing brakes.  This will help with users who have hydraulic brakes the sensors are not compatible with. 

You can also choose to go with a brand new set of hydraulic ebrakes with the sensors built in. 

Throttle options

If you are not sure about this one... pick the universal thumb throttle Thumb throttles are the safest and fit all bikes.

If you like motorcycle twist throttle, our custom Luna throttles are awesome.

Programming Cable Option

The Bafang has many setting which will effect the way the power comes on especially in pedals assist mode. We highly recommend this $20 option because it will allow you to customize in the future.

Their are many great programming guides available on the bbshd online. 


Luna Install Tool option

There are some proprietary nuts on the bottom bracket of the BBSHD that can be a little tricky to install without the right tool (still very easy to jerry rig something)

However the Luna install wrench was made to make this task a snap and make taking on and off your drive easier in the future. 

This is a $20 option.  Luna manufactures  this kit in their shop, and makes it affordable...the bafang install kit would cost anywhere from $65-$150 depending on which dealer you bought it from. 


73mm hardware

We include hardware to fit onto a 73mm BB shell (see below)


On a 73mm BB you may not fit the outer lockring on when using a BBS02 or BBS01. You also need to use the extra included washers, and the longer M6 x 20mm bolts. Use Loctite on the threads of the axle instead of using the second lockring (which really just acts as a jam nut) (this only applies to BBS02, BBSHD has long enough axle this is not necessary)


Support notes

Installation and use


How to Order the Right BBSxx Kit

BBSHD Pre-Buying Questions and Answers

BBSHD Chainwheels compared

BBSHD Installation

BBS02 Wiring Alternatives


Important - read and bookmark these links:


Product Reviews

Write Review

  1. Very Complete Kit

    Posted by John on Sep 19th 2017

    I'm pretty well equipped with bike tools, so all I needed was the Luna installation tool to get this job done quickly and easily. I ran into no hiccups with the installation of the kit. I only have about 100 miles on the converted bike but am more than happy. I have opted for nine levels of pedal assist which, coupled with my 9-speed Deore XT cassette, gives me the right combo for nearly any situation. The power is more than adequate for rolling hills and the pedal assist is very smooth and unobtrusive. I can easily cruise at 20-22 mph at level 3 and 25 miles leaves me with around 75% battery. You really do want to get the gear sensor option. At any assist level above three, without it you'll be really hard on your drive train. With it, it's like buttah. I converted a Cannondale F700 mt bike. With the 26" wheels and the 42t Lekkie Bling Ring, I spin out at around 32 mph. YMMV but I was amazed at the top speed with the 42t chainring.

  2. much easier than expecst ted

    Posted by Unknown on Aug 28th 2017

    Installation on my Tern folding bike was fairly easy. The cables were all the perfect length. The only tricky bit was when the bottom bracket was just a little too narrow for the motor shaft. I took the BB tube to a machine shop, where it took about 30 seconds to ream it out a little with a lathe. It's a kickass motor, and goes way too fast, so I set the speed limit down. The original chain is the right length, but the chain angle is a bit different, and so it pops off in low gear. That's easily solved by adjusting the 'L' screw on the derailleur so that it can't go into the lowest gear.

  3. its definitely worth for its price but i had to mention couple things before you folkspurchase it

    Posted by Ekin bozkurt on Aug 21st 2017

    i'm working as bike courier/bike mechanic and riding my bike +1200 miles per month.On last three month i had chance to test it quite throughly,

    Bafang BBS02 is great product for someone buying first e bike mid drive kit.
    yet its has some well known weakness that you have to know before you purchase it
    *crank arms made by some kind of low quality aluminum(or chocolate ) ,my both crank arm wear off within just couple week,
    *within month my motor loosen from bottom bracket because of triangle shaped bottom bracket shell comes with kit is poorly designed way to stabilize whole motor. after my research i found out this is also common problem for bbs02
    end third month clutch is broken now ordering new part from Luna cycle guys

    so my conclusion
    *its really easy to install whole system , it doesn't require any special tool, which is great!
    *price is good ....for right users. if you want to rely for your daily commuting or for heavy use this is not right product for you
    if you use wrong you can easily fry mofset or ruin its plastic gears . BBS02 needs tinkering, fixing, and certainly comes with big learning curve that probably you are not ready for it ,if you looking for product that you can install it and dont worry about , that's a BBSHD

  4. Badass ebike motor

    Posted by Unknown on Jul 20th 2017

    I just completed my first ebike conversion on a full-suspension mtb and I am very impressed with this motor. The fit, power, and build quality is pretty amazing. It's hard to go back to any regular mtb after hitting 30+mph with little effort from this bad boy.

  5. Budget builders rejoice!

    Posted by Chris on Jun 7th 2017

    I bought this motor for a glorified kiddie hauler. It was mounted to a fat tired cruiser and paired with a 30Q Mighty Mini battery for towing a D'lite trailer around the hills in town. I couldn't be happier with the purchase. The bike is now a hill eating beast with more power on tap than I'll ever need.

    That said, I am a bit of a slowpoke. I usually ride on PAS 1 and rarely exceed 20 mph. I also play it cautious and change gears often by tapping my front brake to disengage the motor (like a clutch).

  6. BBS02 Motor Kit with DPC-14, Gear sensor, shark 52v 13.5

    Posted by Dennis on Jun 4th 2017

    In short, just awesome, would buy this kit again!

    I took two 1993 Rockhoppers and replaced derailleurs, cassettes, brakes, greased all bearings and scrapped years of dirt off the frames. Being in our mid 60s both with limiting medical conditions, we wanted to ride again. Our only option was an ebike. After looking at and riding a production ebike we decided to build our own. I read and view as many articles on the net as I could (youtube is my friend) and decided Bafang bbs02 with a 52v 13.5 amp battery would meet our needs. Then selecting a vendor was easy, I don't like fluff in advertisement, candid answers and product descriptions reign supreme with me. I ordered from Lunacycles.

    Installation of the kit was a breeze, I struggled with the derailleurs and brakes (not a Luna problem, just a novice problem). Next time it will be an internal gear hub not a derailleur.

    My first ride was an adrenaline rush! I was wondering what did I get us into now. We had tested a bosch bike and liked it, but the BBS02 motor is in another category altogether. Changing the PAS levels from 5 to 9 moderated the acceleration/speed for us, that is a positive thing. So far we mainly use PAS 1 and 2. We are mobile and active again.

    I would buy this kit again.

  7. Newbie but install was easy.

    Posted by Craig on May 31st 2017

    Never ridden and e-bike never built one! I had a bike shop remove the bottom bracket for me and did the rest myself. Install took less than 3 hours and I was not rushing at all. This is a commuter bike i ordered the 48 tooth chain ring I should have ordered the 52 (I have since). The 48 tops out at about 37kmh on pedal assist pedaling any faster is difficult. I had trouble with my rear derailer cable being trapped by the motor I used a small piece of abs pipe as a spacer. On throttle it goes about 50 kmh (30mph). I used a 13.5 ah 52v battery and on the first charge got about 50 kms range using mostly pas 3 of 5 very little throttle and lots of hills, according to the display I am generally drawing 300 to 500 watts.

  8. Good power and quiet drive

    Posted by Unknown on May 17th 2017

    The Biffing bbs02 is a great powertrain for a commuter bike. Sufficient power to cruise at 20mph in a compact package. The drive came with shift sensor cable included which I did not expect. (maybe I'll install a shift sensor in the future)

    Installation on a carbon fiber bike was a bear, but with sandpaper and grease I got it all to fit.

  9. What an amazing bit of technology.

    Posted by Nate on Apr 6th 2017

    My commute is about 44 miles round trip in hilly terrain. When I was younger, I could do this commute once a week and it was pretty reasonable. As I get older, the I find the morning leg took a lot out of me for the work day and the commute home became a real chore.

    I've been looking at these kits and ebikes for about 18 months when I decided to pony up the money and retrofit it to my 1996 Mongoose hybrid.

    Installation is straightforward, especially using the youtube videos and the polarized, color coated plugs makes the hookups very straightforward.

    The finished product is fantastic. I can just make a full round trip on one 52V battery pack if I'm judicious with the support. I strongly suggest the gear change sensor if you have a derailleur. The system is nearly silent and the motor support is unobtrusive.

    Definitely not an electric motorcycle, you still have to put in some effort.

    I'm very impressed.

  10. Hands down, easiest to install and best mid-drive for the $$$

    Posted by Dayn Anderson on Mar 17th 2017

    I first had the pleasure of riding my friend Rassy's BBS02 tadpole trike with a BBS02 about 7 months ago, and was very impressed how smooth, powerful and easy it was to use. Just get on a the bike in assist kicks in automatically! I have now built 3 kits (two for customers, one for myself just arrived recently) and I works great. There are lots of mid-drives out there, but few deliver the goods so easily and offer a throttle as well as the assist! I have no doubt when I am going for maximum range that I would be able to get 50 miles + at assist 1 - 2. I make occasional deliveries from Oregon City to Portland, about 23 miles one-way, had to make my last one on my cargo bike as this kit wasn't quite ready, just took it out today and hit 34 MPH with brisk pedaling on my Muddy Fox Xernt! (build thread here on

  11. Mid drive fun!

    Posted by James Hansen on Mar 13th 2017

    I love this mid drive! I installed it on my Cannondale Flash 29er and it has transformed the bike into a Lunacris beast! I paired this mid drive (52 tooth sprocket front and 11-36 cassette) with the Mighty 30Q battery and am very happy with the combo. I commute 7 miles in the Seattle hills and this gives me a nice balance between top speed/hill climbing power and range. Top speed on the flats is about 30 mph, downhill is about 40 and climbing is anywhere from 15-25 depending on the grade.
    Would I buy it again, yes! Would I go for the BBHSD and a bigger battery next time, maybe.

  12. Great kit. Very satisfied

    Posted by Dennis on Feb 28th 2017

    Lunacycle has done a great job beefing up the motor and packaging the kit. It comes with everything you need to convert a bike to an ebike. I highly recommend getting the luna wrench for tightening down the lock ring and the toolkit if you do not have any of the bike-specific tools like the bottom bracket removal tool. Their battery and charger optiona are great too.

  13. Powerful, quiet, and flexible

    Posted by Matthew Shirley on Feb 28th 2017

    I'm really enjoying the power this unit provides, along with a 52V battery. Installation was a breeze, and the sound of the motor is less than the sound of my tires.

  14. Impressed !!!

    Posted by Martin on Feb 26th 2017

    What a cool kit. Moving from an older 2014 kit from another brand, I'm impressed to see the improvements on e-bikes. The kit comes with everything you need, compact, practically plug and play, and quality is very good. Very satisfied with the power it brings, and paired with the Luna display and programming cable the whole experience is extremely flexible and simply a breeze !! Oh yes and the silence, oh wow how this is silent ! Can barely hear it.

    Heads up: this kit fits a 73mm BB such as from my Surly Krampus (of course it fits 68mm as well), but you will need some spacers/washers plus a couple of longer M5 screws for a 73mm BB, as the ones that come with the kit are too short - and Luna doesn't ship it with these (I think they should). TIP: if you're not going to use the break levers like me, just grab these couple of screws from them, it's exactly the size you'll need ;)

    Everything combined this is an amazing kit. Go for it, I highly recommend it.

  15. make sure you don't have integrated brake/shift levers!

    Posted by jill vaccaro on Feb 17th 2017

    tool kit and luna wrench installed kit.needed to supply my own spacers and 2 longer bolts to install motor to my bottom bracket..not a big deal.could only install e-brake lever on side where front derailler was i have integrated brake shift levers. should have gotten the brake sensors for my own levers

  16. i don't do reviews

    Posted by Unknown on Dec 9th 2016

    bbs-02b product *****
    cs ***** shout out to Ashley & Gus
    overall experience *****

  17. almost perfect

    Posted by Unknown on Nov 1st 2016

    the only issues i had were that the battery plug and the motor plug were different. i stuck with the anderson plug that the battery came with. they can be hard to find if you live in a small town. you can always get them online but that means waiting. they come with crimp connectors but they really need to be soldered. its nice to have the thumb throttle for that blast of power to get across busy roads. i would also like a smaller chainring . it would make gearing work better with motor speed and cadence. my water bottle bosses weren't in the right place to mount my battery on the down tube so i had to mount on my rear rack. an adapter plate could solve the problem . all in all a very good kit at a great price. very pleased. thanks luna

  18. Fast and friendly

    Posted by W Wheeler on Oct 11th 2016

    I am blown away by this unit. I installed this kit about a month ago and already over 300 miles. Bought the cable for programming but haven't felt the need to do so. Smooth performance. Has made my daily commute quite pleasant . Top notch product from Luna. The full color display is fantastic.