First off, I realize there are already well engineered products already out there, this project is mostly just for rips and giggles…and science
I was wandering through a thrift store last weekend and couldn’t resist buying a $7 monster truck that had some pretty awesome rubber tires on it. My goal is to make a relatively small(for torque) and lightweight wheel that would work well in packed dirt situations like a bmx pump track. Enemy #1 of a pneumatic tire seems to be rolling resistance caused by elastic hysterisis. So my thought was to either line or completely fill the inside of a rubber tire with a material that has better rebound and thus less energy loss.
Here’s where i’m at with the wheels. I’ve cut out the center portion of the wheel and machined a new hub insert out of UHMW to fit bearings
I’ve got myself a liter of shore 80 two part urethane and am trying to decide if I should completely fill the inside of the tire cavity. Or if I should attempt to pour a liner, effectively thickening the tire walls. I am leaning towards the latter option first but if anyone has thoughts or experience with this kind of thing, the 2 cents would be greatly appreciated!