Rear wheel (motor I think) is making this strange sound, it’s infinitely louder when there’s weight on it and I’m actually riding it but it only makes that sound while accelerating with the throttle. I can feel the thumping in the peddles and frame. The faster I accelerate the faster the thumping sound goes. Turn off the battery and peddle like a normal bike and there’s no sound. It’s gotta be the motor right? Not sure if this is a common problem with e-bikes since it’s my first one. I got a good deal on this bike and I’m starting to see why.