Teams in all three NASCAR series in action at Chicagoland this week will run the same Goodyear tire set-up . . . these are two different tire codes than these teams ran at Chicagoland last year, though they have run them at other tracks this year . . . in Sprint Cup and Camping World Truck, this is the same combination of left- and right-side tires teams ran at Texas in April and June, respectively . . . Cup teams also ran this left-side tire at Dover in May . . . in Xfinity, teams ran this left-side tire earlier this season at Texas, though this is the first time they have run this right-side tire . . . like last year at Chicagoland, this right-side tire code (D-4686) employs Goodyear’s multi-zone tread technology, which combines two distinct tread compounds on the same tire ‘ the outboard 10 inches of the tread (Traction Zone) features a compound that is designed for grip, while the inboard two inches of the tread (Endurance Zone) is toughened to enhance durability on the part of the tire sees the most heat and takes the most abuse . . . compared to what was run at Chicagoland last season, this right-side tire features a construction change, and a compound change on the outboard 10 inches to give the cars more grip . . . this left-side tire code (D-4684) features an updated construction and mold shape change, as well as a compound change for more grip . . . as on all NASCAR ovals greater than one mile in length, teams are required to run inner liners in all four tire positions at Chicagoland . . . air pressure in those inner liners should be 12-25 psi greater than that of the outer tire.(Goodyear), for tire codes, pressures, set limites and more, see the Chicago Race Info page
