The FIA has formally opened up the tyre tender contract for the Formula 1 World Championship from 2017, Motorsport.com has learned.
With Pirelli's current contract in F1 running out at the end of next year, moves are now underway to find out who will supply rubber to the teams for the 2017, 2018 and 2019 F1 world championship.
In documents released by the governing body, it has invited tyre companies that are interested in applying for the deal.
They must lodge their applications by June 17, with the evaluation process set to begin the day after.
A decision on whether or not the tyre supplier has the right technical and safety criteria will be made on July 17, before it narrows the selection process down to the winning candidate.
Michelin recently expressed interest in a return, but only if the technical rules were different.
FIA open to new wheel diameter
There is talk of a big overhaul of tyre design for 2017 with wider rear tyres.
The tyre tender document makes clear that the FIA is open to making wheel diameters larger than the current 13-inches.
In the documents, the FIA has said: "It should be noted that, whilst the wheel diameter is currently set at 13 inch.
"This should not preclude an increase in diameter if the tyre manufacturer feels there may be advantages to the COMPETITORS by doing so. Full details should be provided."