BAFANGGear Sensor for Mid Motor : Shift Sensor for Mid Drive Electric Bike Conversion Kit BBS02 BBSHD BBS02B BBS01 - Ebike Derailleur Shifter Cable Parts with 3Pin Male Connector (16.9 inch)

Very pleased with this item and fast service

This review is for the gear shifting sensor that triggers the motor to momentarily shut down while you're shifting gears, so your chain and gears don't get damaged or worn excessively by hard, jarring shifts.This is a much-needed addition to the Bafang mid-drive e-bike conversion kit. Without it, every time you shift your rear derailleur the chain will slam into gear under power, shortening the life of both your chain and cogs. You could simulate this by slightly pressing on your brake while shifting (assuming your brakes have sensors on them), but it's nice to not have to think about it.This didn't fit my bike the way it shows in the video I saw. In the video, they show this being installed on a bike with cable casings. A section is cut out of the casing and this is installed where that used to be, with the remaining casing butting up to the sensor on both sides with a seal between the sensor and the casing. Although my bike has some casings, on most of the chain stay it is bare cable, and that is the only place where it was practical to install this.To get around the problem, I cut a length of old casing and installed it on both sides of this sensor, then zip tied the sensor and the casings to the chain stay. Without doing that, there is no way to keep water out because there is nothing to hold a seal in that would normally go between the casing and the sensor.But after getting around that problem and getting this installed, the bike shifts smoothly and without jarring the chain and gears.

Plug and play and I feel it's a must for any e-bike build with a rear derailleur. Fit my Bafang kit perfectly.

Kills motor power for split second when shifting gears as advertised

This is a simple but needed addition to the Bafang kits to take the pressure off your drivetrain components. Easy to add and plugs in the kit seamlessly. This should be included with the Bafang kit!!

This sensor works great. Although the shift sensor is considered optional, it really isn't if you don't want your drive train destroyed by over-torque'd shifts. This sensor takes the motor load off for about .5 seconds when you shift so cog changes can occur smoothly without banging up your cassette and chain. Works great and really should be supplied with every conversion kit. Installation is straight forward but be prepared to swap out your shift cable at the same time.....my original cable was too short after adding the sensor because I needed some additional sweep to the derailleur.

Had to see how you put this on , and by seeing videos , the cable for the gears goes through the sensor then connect wire plug and zip tie to frame ! I thought it was a laser but no!You tube , shows installation and better idea depending on the bicycle !I like this idea better than squeeze beakes to change gears , cause I forget !

Great 👍

Would like to give it a good review but I got it and can't use it as the e bike kit that was sent to me was the wrong one for my bike and have to wait 3 or 4 more weeks to see if I can get the right kit for my bike or if I can get my money back

A must use if you are using your mid drive with gears.