The plot, as they say, has thickened as news reports out of Europe say that Pireli will definitely place a formal bid to become a tire supplier for the series beginning next year.
The offer, according to some reports, would be for all F1 teams making Pirelli the exclusive spec tire and may include a change from 13-inch wheel diameters to 18-inches.
Reports also say that Pirelli plans to make its formal presentation prior to the Spanish Grand Prix next weekend.
While Michelin and Cooper have expressed interest, there has been no further word regarding any formal bids.
Pirelli was quite active in F1 in the past, posting 44 wins between 1950 and 1991, when it left the series.