The title of the thread is "FIA launches tender ...", which implies that the FIA control who the supplier(s) is, what the specifications are and what compounds are made available. The sporting regulations - published by the FIA - would dictate how teams can use the tyres. It's possible (likely?) that the FIA act upon advice/recommendations from FOM or the teams. But they are the ones that enact it all.
This is what Joe Saward wrote the other day:
The other things worth looking out for is the ongoing “tyre war” because Bridgestone and Pirelli are fighting to become the exclusive Formula 1 tyre supplier for the next contract, which will run from 2025 to 2027. The deal will cover three seasons, with an option for a fourth and will include tyre supply to F1, F2 and F3.
The latest word is that both tyre companies have been accepted by the FIA to become candidates for the role, and it is now down to the Formula 1 group to negotiate the best commercial contract with one or the other. On paper there is only one likely winner because Bridgestone is a far bigger company with revenues of $24.1 billion per year (the second biggest behind Michelin at $26.37 billion). Pirelli is only the sixth biggest player in the market with revenues of $5.9 billon. Pirelli has all the technology needed to produce the tyres F1 requires in 2025. Bridgestone has been out of the game for long time, and so would need to get a proper test programme as the cars are bigger and heavier than they used to be. But how will that work? The teams will all want to be involved in any test programme but there are restrictions, which means that Bridgestone might need to build its own car to ensure parity of experience and then there is the question of whether choosing Pirelli would drive Bridgestone away if Pirelli decided it only wanted a final deal, as it has achieved most of what it wanted in F1, so signing up Pirelli for a last deal might not be wise. The one thing that F1 does not want is to be left without a tyre supplier in the future, so the choice is complicated.
So the sources on the internet are saying that Pirelli has been chosen, but I'm not sure of the veracity of those, but it seems pretty certain that FOM are the ones with the final say, I guess because it is a commercial deal.
Edited by JimmyClark, 28 July 2023 - 10:43.