Why didn't F 1 tire use M instead of B in 2007?

Since the FIA planned to fully implement the "single tire" supplier in 2008 at the end of last year, this French company has been hinting to leave F 1. During the Belgian Grand Prix of F 1 last weekend, Pierre du-Paschi, director of Michelin motorsport, said, "The management of the company will make a final decision in the near future." According to Du Paschi, Michelin disagreed with the FIA's "one-child" policy from the beginning. "This fundamentally runs counter to the company's vision and does not help to enhance the interest of the event."

"If there is only one tire supplier, the supplier may give a team special treatment, such as working closely with it to achieve a balance between tires, aerodynamics and friction." Obviously, Du Paschi's words alluded to the special relationship between Ferrari and Bridgestone. "If I want to take special care of a team, I will develop tires that achieve the best balance for the team and then provide the same tires to everyone."

However, these high-sounding arguments are not all the reasons why Michelin intends to withdraw from F 1, because Michelin won all the competitions before this season before this year's American stop, so there have been rumors that the FIA has confirmed its full cooperation with Michelin in 2008, but after that unprecedented strike, the contradictions between the two sides were abrupt, just at the beginning of last month. For the first time in ten years, FIA changed the designated tire of FIAWorldTouring Car Championship Edouard Michelin to Yokohama tire, which still rankles French company president Ai Du Valle Michelin.