Tamiya Compatible Wheel for 3mm Hex Shaft

This is a 66mm wheel for a Tamiya 3mm hex shaft. I reused some silicone rubber bracelets (the green bands) as tires. In fact, that was the whole purpose -- to make a useful wheel with those bracelets. The circumference is about 210 mm.

You can also see the lego-compatible rails mounting to the Tamiya gearbox, as well as a custom enclosure. The mounting rails are here, if interested: http://www.thingiverse.com/thing:1219292

There are two models: one regular wheel, and one with a brim. The