20's are the maximum wheel size. I would not do it myself, but that is your choice and your money.Tommybobommy said:
When you migrate away from the original profile (stock rim + tire height) you begin to load the axles with latteral forces they were never designed to accomodate. Aside from the occasional rub every now and then, there is a lot of extra stress on an already older car. Not a good idea from a mechanical viewpoint, but they do look cool.