N20 34mm Rim and Tire Tread
thingiverse
This 34mm wheel hub is modeled after one of the popular ones you can buy online. The center has the D shape and will fit over standard N20 gear motor for a friction fit. I have printed the hub from both PLA and ABS to make 150g battlebots. The tire tread was printed from Overture TPU. They don't have a lot of grip for making tight turns but for straight on speed they work well. I may look for a softer brand of TPU. There is a groove along the perimeter of the rim and opposite extrusion on the inside of the tire tread which centers the tire on and locks it into place. The tread diameter is smaller than the hub to allow a snug fit when you stretch it over the rim. You may need a strong pair of tweezers of needle-nose pliers to stretch the tire over the rim depending on your brand of TPU.
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