They have a stiff sidewall and are more suited for road racing/autocrossing. While they are good for the track I wouldn't recommend them as a daily driven tire because they don't have a very long treadlife and I have heard they are a bit loud.
John Yim (Houston) 91 ZTT Stage...stages are confusing. Just read the mods. :) 30 BSP, Houston Region SCCA "...Just as they're about to catch me... Twin... Turbos... Kick... In..."