Designed to fit DC motors with D-Shafts or hex hub adaptors these wheels are a great size for smaller robots with solid durable plastic construction and grippy rubber treads.
Casters are often used as a wheel that can go in any direction, forming a stabilizing wheel of a differential drive robot.
Tank style Caterpillar tracks work best for uneven ground when your robot needs to go outside or traverse some tricky shag pile carpet or laundry piles. Tank tracks are just cool!
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