I'm looking into possibly mounting a set of R Compound tires on my 15'' stock wheels for use in autocrosses and track events. Any recommendations? I assume the best size is 225/50/15 for the stock wheels, right? I am really just looking for an all around good tire that will last me a while. Maximum performance isnt so important at this stage.. Any R Compound tire will be a serious upgrade from my street tires anyway. Let me know if anyone has any particular recommendations. Thanks.