Both the Sprint Cup and Xfinity Series will be using tire compounds they have raced on in the past at Talladega Superspeedway this weekend.
The Sprint Cup Series first used the compound in October 2014. Xfinity teams first used it in May 2015.
Both series used the left-side code in the Daytona 500 this year.
Left side –D-4596 ; Tire Circumference: 87.91 in. (2,233 mm); Minimum Recommended Inflation: Left Front — 27 psi; Left Rear — 27 psi.
Right side — D-4630; Tire Circumference: 88.39 in. (2,245 mm); Minimum Recommended Inflation: Right Front — 50 psi; Right Rear — 50 psi.
As on all NASCAR ovals greater than one mile in length, teams are required to run inner liners in all four tires at Talladega. Air pressure in the inner tire liners should be 12-25 psi greater than that of the outer tire.
Sprint Cup teams will be allowed three sets of tires for practice and qualifying and six sets for Sunday’s race. Xfinity teams will be allowed four sets of tires for the entire weekend.