It's not unusual for a tyre manufacturer to have its fingers in other motorsport pies but this is a whole different kettle of fish.
You can't make tyres that don't work or puncture easily when it comes to two-wheeled racing, as Pirelli's early F1 tyres did.
If you crash on a motorbike, you fall off and that increases the chances of injury exponentially against being strapped into a car.
The potential PR disaster that could strike Pirelli if they mess up the new tyres could be almost unrecoverable and that will mean a lot of resources will be going into this new project.
F1 wants to see a commitment to the cause for its tyre supplier and this announcement will have opened the door for Bridgestone to take advantage.
The Japanese manufacturer will happily point out that Pirelli might not have F1 as the centre of its attention as a result of the Moto2 and Moto3 deals.
Alternatively, Bridgestone is only trying to enter F1 and not take on extra ventures which may well be a swaying factor when F1 makes its decision.
Both could be granted a spot on the grid for the 2025 season but who would be willing to abandon Pirelli after more than a decade?