Nowadays they use the 2021 version of the Canyon Endurace CF SL 7. And the Shimano neutral support team is used in most World Tour races, not only in the Tour de France.

The Shimano neutral support team has a list with the materials each team is using, so they can quickly get the correct bike from their car and hand it to a rider if needed. You can see an example of the list here [1]. For example, you can see that they know the pedals used by each team.

[1] https://images.vrt.be/width1280/2026/04/13/db02d167-1a93-4c5...