The title of your thread caught my eye, and I doubt that was an accident.
"The Art of the Motorcycle" was the name of a major exhibition of motorcycles and their memorabilia at the Guggenheim Museum which opened in New York June 26th of 1998.
I drove up to the exhibit at the Fields Museum in Chicago to see it in the winter of 1999, and I still have the monograph by the same title. That's where I found the dates of the exhibitions as they had slipped out of my short term memory.
Photography was aggressively NOT permitted in Chicago when I was there, I was very annoyed. The custodians were hyper vigilant about it, even if we had small pocket cameras as I did. Rats!!
You have an incredible array of images of motorcycle art. I tried to see if I could deduce where they were shot, but wasn't really successful.
Most of my museum shots are from the Museum at Barber racetrack near Birmingham Alabama or Wheels Through Time - Dale Walksler's Museum in Maggie Valley North Carolina.
I remember one exhibit several years ago in Indianapolis at the Eiteljorg Museum of Western Art "Steel Ponies" exhibit
I remember studying the board track racers on exhibit in Barber I think, and tried to imagine riding at triple digit speeds ( > 110 mph ) on quarter mile banked wooden track courses on a motorcycle with 2 or 3 inch tires and no brakes, with an engine oiled by an open course oil system, dripping through the engine out of the crankcase, and out onto the wooden racetrack. Our forebears were far braver than I, or maybe just crazier.
Notice carefully, no brakes, front or rear axle.