Electrifier 100RPM Dual Shaft BO Motor with 65mm Wheel, DIY Robot Set of 4 | Powers line follower and obstacle avoidance builds, 0.8 kg cm torque, 3V start, plug-fit hubs, low current battery drive

Building a smart car, line follower, or obstacle avoidance robot starts with a dependable drive stage, and this Electrifier pack puts the complete stage in one box: four geared BO motors and four matching 65mm rubber-tread wheels. The plastic-geared design keeps weight low, which matters on battery-powered chassis where every gram of drivetrain mass eats into runtime and payload. Each motor operates across a 3V to 12V DC window and draws just 40 to 180mA with no load, so the set runs happily from AA battery holders, 9V packs, or a regulated supply through common driver boards. Rated output is 100RPM with 0.8 kg cm of torque — a deliberately moderate speed that keeps classroom and first-build robots controllable rather than skittish. The dual shaft layout extends the output through both faces of the gearbox: mount a wheel on one side and reserve the other for an encoder disc when your project graduates to speed feedback. The wheels press directly onto the D-profile shaft with a firm push fit, no fasteners required, and the textured rubber tread holds traction on smooth floors, tiles, and lab benches. The pack suits Arduino, Raspberry Pi, and ESP32 based vehicle projects, school and college working models, and quick prototypes where you want motion running in minutes rather than hours. As part of the Electrifier robotics components line, it ships with a one-year warranty and is produced under ISO-certified manufacturing, with every published specification cross-checked before listing.