The I-BEAM is designed for traditional tracks with a little bit of loose dirt. The larger lugs allow the tire to dig deep for maximum traction when it is needed the most. The center cross split bars give good forward bite and when used on the rear allow the car to rotate better in the turns when this is desired. Super Soft long wear is developed to work in colder conditions where the track either has an abrasive surface or a surface that gets very polished which creates lots of wheel spin and therefore more wear. This compound will be popular in the winter months where drivers are still competing on outside tracks in cold weather.