Control motor output precisely with a BAC4000 controller from Golden Motor. It regulates acceleration, torque, and energy usage for smoother, safer rides. Compatible with high-powered e-bikes, scooters, and DIY projects, it ensures consistent performance, durability, and efficiency. Ideal for riders seeking reliable, controllable, and energy-conscious electric mobility solutions. https://goldenmotor.bike/collections/surron-parts-and-upgrades