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Gearsensor for Bafang Mid Drives

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Product Description

  • Intelligent sensor that will power down or shut off the motor during shifting to avoid chain grinding and cassette breaking 
  • Extend the life of your gears indefinitely with the gearsensor
  • An absolute must for mid-drives
  • Made for both deraillers and internally geared hubs


The Gearsensor acts like a speed shifter so you are able to shift your bike at full throttle and barely fill the throttle cut off.

It will make your BBS02 or BBSHD shift faster, smoother and safer. 

Here is a link to the manual and installation guide on the Gear Sensor

Luna Cycle is proud to be one of 2 distributors of the Gearsensor in the United States.

The Gearsensor is plug and play with any BBS02 or BBSHD in place of one of your ebrakes and is a 15 minute install. 

If you install it with our newest edition of BBS02 or BBSHD (the ones with the luna cycle logo engraved on the side) the controller has a separate ebrake connector so you can use both ebrakes and the gear sensor. If you go with this setup the shifting power delay is much shorter than using the ebrake connector.

However the gear sensor will work with all bafang mid drives by simply connecting it to one of the ebrake cut off switches.  It will also work with any mid drive equipped with an ebrake cut off as long as the user can rewire it to fit their ebrakes. 

Support notes: 

Please see this documentation to protect your gearsensor from mud and debris for long-term reliable use.

See this documentation to service your gearsensor in the event an unprotected gearsensor gets clogged up with mud.


Product Reviews

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  1. Worked for 5 weeks then quit.

    Posted by Michael T. on Aug 14th 2017

    I was hoping for something that would last more than 3 months for the money they want for it.
    When it was new it worked like a dream, but quickly started to miss and mash gears, worst when down shifting rather than up.
    I'm not sure if it's an internal problem, the cable, or the connection.
    Oddly, every time the rear wheel went over a bump, it cut out.
    *There is no LED on the one I have, so it is probably the older item*
    I tap the brake cut off, or back off the throttle for shifting now.
    Spend your money on something else.

  2. Great option

    Posted by Unknown on Jul 26th 2017

    Great option and works. Would like just a little more delay as you can rely on only one gear at a time. If you have rapid shift and jump multiple gears you will sometimes shift hard.

  3. Solved my gear grinding problem.

    Posted by Unknown on Jul 25th 2017

    I installed a Bafang on my recumbent trike and used this too stop the gear grinding when the motor was on. Before I had to slightly press the brake to shut down the motor. I was using only one brake sensor so I had a spare to connect this sensor to. Now I can go back to shifting like I did before I installed the motor. Wish the gearsensor came with two cable sleeve end caps. Had to goto the bike shop for that.

  4. Wish I had it years ago.

    Posted by Shaun Disch on Jul 17th 2017

    Glad I have it and it works pretty well but I wish the delay was a little longer or that the motor would ramp up the power instead of just kicking back on, I still feel like my chain, cassette and pinion gear are getting worked too hard even when pedaling, let alone using the throttle. I read guys saying they could use it full throttle but to me that will break stuff much too quickly. I have to pedal to a pretty darned high cadence in order for the gears to switch smoothly. Going up hills and downshifting is very sweet with it though, no more feathering the break and losing all your momentum before the motor kicks back on.

  5. Not As Perfect As Before

    Posted by Jeff on May 9th 2017

    I previously wrote a review on this product. I was correct at the time in saying that it worked perfectly. Well, it's been a couple of months and now it only works about 70% of the time. This causes enough harsh shifts that I can no longer rely on it and have to feather my brake to disengage the motor before shifting. I'm disappointed. When this product works it's great, but 70% reliability is not acceptable. I'm working with the manufacturer to try and resolve the issue, but really, I think it's a flaw in the design. I'll update in the future as I can.

  6. Game Changer

    Posted by croz on Mar 31st 2017

    My BBSHD was absolutely mangling my cassette and the chain had jumped off a couple times on the first ride. I had to learn a technique of "clutching" - using the brake sensors as a way of disengaging the motor to shift gears. It was pretty awkward.

    This gear changer allows me to push 100% without any regard to transmission issues. It disengages the motor for enough time for the shift to complete followed by a very satisfying kick in torque when the motor reengages.

    Personally, I think it's irresponsible for the BBSHD package *not* to include this as part of the initial kit.

  7. Excellent protection for your expensive derailleur

    Posted by Mike on Mar 6th 2017

    While this may not protect your rear derailleur 100% of the time, it does an excellent job of briefly cutting power while you shift, and really takes a load off while the chain is moving from one sprocket to the next. Yes, you can shut down your throttle, quit pedaling if you are using pedal assist, or briefly squeeze your brakes if you have a cutoff switch wired in (I do not). All things I used to do. But my rig is a Free Ride full suspension mtb bike, and often times I am in a difficult climb, or technical section, and it is really nice now, not to have to worry about cutting the throttle, or stop pedalling, but instead just change gears! And I feel much better when I let someone borrow my bike to ride around the parking lot or trails, that they will not be returning my precious eBike with a pretzeled derailleur. Well worth the $ and very easy to install.

  8. My 2nd one

    Posted by david wesley on Mar 4th 2017

    Its is a most to have for ebike. I live in a cold winter climate rhinelander WI north woods. the salt took its toll and had to replace it. make sure you seal the gear sensor and cable well I used hot glue seems to hold up better than silicon. its nice to have it working again

  9. Worth It

    Posted by Jeff Markham on Feb 23rd 2017

    This little sensor seems a bit pricey for what it is, but it's totally worth it. Many riders claim to not need it; they just feather the left brake like a motorcycle clutch or pedal backwards to stop the motor for shifting. That technique certainly works, but it's so much nicer to just shift and not have to think about it. With this doodad you can focus more on your riding. Do yourself a favor and get one of these.

  10. let up on the gas pedal

    Posted by Unknown on Feb 22nd 2017

    This works just like shifting a manual transmission in a car. Let up on the gas pedal and smoothly shift gears. Works every time. I little tricky to install but worth the time.

  11. Essential Add On Item

    Posted by michael pfeiffer on Feb 2nd 2017

    I originally set my mid drive up, without the shift sensor. I just pulled in the brake slightly whenever i needed to shift. This worked fine for me. But whenever someone wanted to try out my bike, i had to explain how to shift to them. I eventually broke down, and bought the sensor. I love it! It makes shifting, dummy proof! And i love that it doesn't cut power completely. On my BBSHD drive there is an input connector just for the sensor. When shifting, it continues to turn the sprocket slowly, to complete the shift. Great product!

  12. Really works well with Bafang dedicated connector on your kit

    Posted by Jeff on Sep 3rd 2016

    I just installed this on one of my 2 bikes, the one I use as a loaner. I love it! It's so nice not to have to do anything to cut power to shift. Someone with no experience can jump on and not abuse the gears, without any special training. Timing of shifting is well executed, with just enough motor off time to finish the shift.

    Works perfectly!

  13. Must have for PAS

    Posted by Mr. Theo on May 6th 2016

    Before I had this thing, I was manually applying throttle while pedaling because I didn't like having to tap the brakes every time I wanted to shift. It made the bike feel more like a motorcycle or some sort of crazy electric speed machine. Which it is... but sometimes it's nice to feel like you're riding a regular bike. This sensor automatically interrupts power when you engage the shifter and offers an more relaxed ride when using PAS.