As two experienced Formula One companies merge, BMW's engine and drivetrain skills are matched to Sauber's chassis and aero knowledge. The resulting car is strangely new and old at the same time.
There are clear design clues from Sauber's C24, but also elements similar to recent Williams cars. These have been added to a car that is totally new and adopts some wholly new concepts in layout.
The design for the F1.06 started back in July. By this time, the problems affecting the C24 were understood, and the remedial aero upgrade package was already released at the start of the European season.
Although the C24 did not have a great season, Sauber were happy as there were no major problems that needed to be addressed when considering the new 2006 car. In fact, the 2005 car's primary limitation was the rear suspension's ability to make the most of the Michelin tyres - something that required a new gearbox case.