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UCI article 1.3.006
“The entire used material must be accessible to all participants. All the components must be available commercially (i.e. available on the market or sold directly by the manufacturer) at the latest twelve months after their first use in competition. If such a deadline is requested and accepted by the UCI, the manufacturer must publicly announce that the product in question is being used in competition and when it will be available for sale. In all cases the product must be in a final stage of development, very similar to the product that will be marketed.”
Ineos use tyres unavailable to the public, according to GCN.
https://www.youtube.com/watch?v=YBfR3I7WKcQ