NASCAR is offering an in-depth look at its Xfinity Series flange-fit composite body, which will be available for teams to try in three races this season ahead of a full-time introduction by 2019.Teams will be permitted to run the new body at Richmond, Dover, and Phoenix, and it is expected...

NASCAR's Xfinity Series teams will have the option of running a flange-fit composite body at three races this season ahead of a full-time introduction by 2019. Teams will be permitted to run the new body at Richmond, Dover, and Phoenix, and it is expected to be optional at all non-superspeedway...