BAFANG BBS HD 1000W Lastest 48V/52V 1000W Ebike Electric Bicycle Motor Mid Drive Electric Bike Conversion Kit with 48V 52V 13Ah - 20Ah Downtube and 48/52V 17.5Ah Rear Rack Battery (Optional)

Seller 5 stars, kit 4 starsTook me a little while to get the kit installed on my first bike, and from the get go I started having speedo issues. Apparently this is a common problem where you have to mount the sensor just right. After my first failed ride, the speedo sensor died completely and would not register at all. Junstar jumped on the case, had me ship the kit to their repair center and I got the issue resolved. I reinstalled it into my road bike since and its been working great.Now for the kit itself. First off, this thing is HEAVY. The combination of the motor and battery is way heavier than I expected. It is what it is, but I was taken by surprise. With the assist levels on, you don't really feel it, but if you turn off assist, pedaling the bike becomes WAY harder. The motor sitting on the pedals also feels very strange. You can definitely feel how it pulls and it just takes some time to get used to that feeling. Moving the bike backwards is also jarring as the motor will fight you. Now the power of his drive is AWESOME. Im a big guy (280lbs) and I've had no problems going up huge hills with minor input. If anything it makes my ride too easy.The one down side of the kit is the way it mounts to the frame. The drive just slides into the bottom bracket and is supposed to just be held in place by tightening the bracket nuts on, but this is crap. Within 10 seconds it will come loose and will just dangle off the frame. I took a large hose clamp, cut it in the middle and attached the ends to the sides of the motor and tied the whole assembly to my frame. This keeps it fairly stationary, but its shitty that they haven't come up with an out of the box solution. This is why the kit loses one star.Overall its great for what I need and Im happy with my purchase.