[mithril865]

I'm looking for information on an expandable wheel a team was using on their shooter at Championships this weekend. It was white with spiral supports that extended from the hub to the outer wheel and it expanded as the wheel rotated. Unfortunately I didn't take a picture nor did I write down the team number. Our team is doing an off season project and a wheel like the one I saw would be perfect. I've tried google searches for expandable wheel/casters, shock-absorbing wheels/casters, and have come up empty. This is the closest I've found...

Thanks in advance!