The fairings are not the rim. They are part of the braking duct system, or so does Ferrari says, and as the "regular" brake ducts are in a way a part of the rim to the other side and made of CF, so are the fairings.
The overall width of the car, including complete wheels, must not exceed 1800mm with the steered wheels in the straight ahead position. Overall width will be measured when the car is fitted with tyres inflated to 1.4 bar.
The width of the F2007, reported on this site, as others, is 1796mm. So I guess they have some room there.
In order to prevent tyre damage to other cars, the top and forward edges of the lateral extremities of any bodywork forward of the front wheels must be at least 10mm thick with a radius of at least 5mm. Providing it is inclined at an angle less than 60º to the car centre line, the forward edge of any horizontal part of the bodywork in these areas need not comply with these requirements.
It's not an aero reg. It's a bodywork reg. and clearly another hole in the book.
Aero regulations states that:
With the exception of the cover described in Article 6.5.2 (when used in the pit lane) and the ducts described in Article 11.4, any specific part of the car influencing its aerodynamic performance:
- Must comply with the rules relating to bodywork.
- Must be rigidly secured to the entirely sprung part of the car (rigidly
secured means not having any degree of freedom).
- Must remain immobile in relation to the sprung part of the car.
The cover in 6.5.2 is the refueling connector cover and the ducts in 11.4 are the front and rear brake ducts.