Rumani® 2 wheel Robot Smart Car Chassis Kit BO Motor wheel Kit with Speed Encoder, 2 Wheels, 2 Bo Motor , 1 Caster Wheel and Battery Box for Arduino DIY (2 Wheel Kit)
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Amazon.com: The perseids DIY Robot Smart Car Chassis Kit with Speed Encoder, 2 Wheels and and Battery Box for Arduino/Microbit/Raspberry Pi (2 Wheels) : Toys & Games
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nBot, a two wheel balancing robot
classical mechanics - Calculate a two wheeled robot wheels rotation velocity for different movement - Physics Stack Exchange
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Motors Wheels and Chassis Accessories - 2 Wheel DIY Robot Chassis Kit Wholesale Trader from Mumbai
nBot, a two wheel balancing robot
File:Two-wheeled surveillance mini robot "Boomerang".png - Wikimedia Commons