They are a little wider than stock but same diameter, 235/60 15. On some cars the fronts MAY rub at full lock. The Firestone Firehawk Indy 500's are getting awesome reviews. I just bought 2 for the front. 255/60 for the rear is a nice tire, not stock looking, and will be a little taller than stock which throws your speedo off. But they look pretty bada$$ IMHO.