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Very similar to the Pololu 80x10mm wheels (see http://www.pololu.com/catalog/product/1434).
Wheel is 76.5mm across (80mm with a "tire") and 10mm wide.
The mounting holes are for 4-40 machine screws. The top and bottom holes are spaced 3/8" apart horizontally and 16.5mm apart vertically. The middle two mounting holes are 1/2" apart.
The shaft hole is "D" shaped, 3.0mm in diameter with a flat 1.0mm away from the center of the hole.
I would suggest 3D printing these guys. If you can print support material print the Poleel80x10mm.STL. If not print 1X of each of the Poleel80x10mmTop.STL and Poleel80x10mmBottom.STL and then glue together.
Poleel 80x10mm by harrisonhjones is licensed under the Creative Commons - Attribution license.
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