Rotational inertia of Smart Cart wheels and axles

What are the moments of inertia for the wheels and axles for the Smart Carts?

There are two different axles on the Smart Cart.  One has the encoder and the other does not.  

6.1 x 10-7 kg-m2, and 5.4 x 10-7 kg-m2 respectively.  This calculation contains a couple of assumptions.  Only the inner race of the ball bearing is included in the calculation and the rotational inertia of the balls is ignored.  

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Smart Cart (Red)

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The Smart Cart is the ultimate tool for your physics lab and includes built-in sensors for measuring force, position, velocity, three axes of acceleration, and three axes of rotational velocity. Patent No. 10481173

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The Smart Cart is the ultimate tool for your physics lab with built-in sensors that measure force, position, velocity, three axes of acceleration, and three axes of rotational velocity. U.S. Patent No. 10,481,173


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