[CSBM5]

Originally Posted by CanAutM3

OK, so in your view, what is the performance drawback of using a wider wheel?

On track? None essentially, depending on the specific tire though however there may be different peak rim widths, but we're talking very small incremental changes here in terms of peak cornering force if we're only discussing say a 10" wheel versus a 10.5" wheel for a 275/35. Transient response is the biggest improvement, and the control-ability of the tire is improved with increasing width; i.e. a 9" wheel in this case feels sloppy and imprecise in transients while a 10 or 10.5 feels nailed down (especially in the rear) with nice communication.

On the street, there a huge range of OE considerations from ride comfort, rim protection, fender clearance (especially in the EU), etc. Wider wheels reduce all of the above.