They are a tiny bit smaller I believe. I went from 245/45R17 all seasons to my 255/40R17 summer tires and they looked to be 1-2mm shorter overall. I don't really have good pictures to show the difference though.
Sold - Black 2000 Mustang GT, gone but definitely not forgotten
- Silver 2007 Corvette
Current - DHG 2001 Bullitt