Back in the day there was two ways to get slick tires with minimal tread: buy them or make them. The owner made them. Still not good for low traction surfaces like rain or center of traffic lane, fine for drag strip
__________________ casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
There is an interesting book call "Old Man on a Bike" about a many in his 70s that decided to buy a Honda Cargo 125 "Pizza Bike" in Mexico and ride it to the bottom of South America. The follow up book is "Old Men Can't Wait" about him riding a different small back north. (The original bike was destroyed in a crash that badly injured the author)
The author very correctly decided that a small bike that is sold all over the region he was going to be riding would be: cheaper to buy, cheaper to run, easier to handle at his age, and able to be repaired by any mechanic he could find. A very different perspective than most long distance riders from Europe that bring a big foreign bike and then have to have every little thing like even tires or tubes special ordered and shipped in for their journey.