I found this site while searching for 26 x 3" tires for my 53mph ebike that I put together. Lots of cool stuff to read here on this forum. One post pointed to the Coker Simplex tires that fit bicycle wheels.
Background is RC dragsters and speed run cars. It went over into 500W ebikes as a commuter and then 6000W powered ebikes. I'm mostly on RC-Monster and Endless-sphere forum.
Here are my bikes