I don’t think it can be related to a work of art. A painting by Monet is unique. There is no other painting like it and that can be verified by experts. The bike of Sagan in Roubaix is one of many identical bikes and cannot be reliably verified. It could be one of a number of bikes Sagan rode and because specialized says what it is, we have to take their word for it. It’s like someone saying this is the ball that was used in the final of World Cup. The art itself is the race which is on video to be appreciated.