Before I get bashed I attempted to search for this probably simple answer! My newly purchased 11 with the SVTPP has original F1 2010 production year tires still on it.The car has roughly 6,800 miles on it and the tires are hard as a rock. I'd love to throw DR'S on the rear with as wide as I can go on the 20's without widing them yet.Any input would be great!Thanks guys!