Diymore 4 Wheel Robot Chassis Smart Car with Speed and Tacho Encoder – diymore
DP-2101 Tank Chassis Tracked Robot Chassis Unassembled Smart Robot Car Chassis | eBay
Amazon.com: Premium TT04 4WD Intelligent Tracked Robot Tank Car Chassis with 4PCS TT DC Motors, Robotic Caterpillar Moving Platform with Metal Plate for Arduino, Raspberry Pie, Microbit Code Projects Science Kit :
Small robot chassis with engines
Pololu - Zumo Chassis Kit (No Motors)
Motor Smart Robot Car Chassis Kit – Kuongshun Electronic Shop
Amazon.com: Robot Kit 4WD Robot Car Smart Chassis Kit with 4 TT Motor for UNO R3/Mega 2560/Raspberry Pi/Jetson Nano, Smart Robot Car Chassis DIY Learning Kit : Toys & Games
New Motor Smart Robot Car Chassis Kit Speed Encoder Battery Box 2WD For Arduino - ASK Electronics