Here's why:
* Drivetrain interference: FWD cars are designed with the wider wheels on the front to handle the driving force. Staggering the wheels with wider wheels in the rear can create issues with the suspension, steering geometry, and even the axles. The wider rear tires might rub against components in the wheel wells or during suspension articulation.
* Traction control and stability issues: The car's computer systems (traction control, ABS) are calibrated for a specific tire size and distribution. A staggered setup can confuse these systems and lead to unpredictable handling, especially during acceleration or braking. The rear wheels spinning more readily than the front would result in the car being quite unstable, possibly oversteering easily.
* Differential issues: While less of a direct problem than the others, the front differential is designed for a specific load distribution. A dramatically different wheel size on the rear might put undue stress on the differential.
* Warranty implications: Altering the wheel setup significantly from the manufacturer's specifications will likely void any related warranty on components like the drivetrain, suspension, or electronics.
In short, while it *might* be possible to physically fit staggered wheels, the engineering and practical challenges, along with the potential safety risks, make it a very bad idea. Stick with the manufacturer's recommended wheel and tire sizes for optimal performance and safety.
